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Query: order: -announced_date_first; size: 200; date_range: from 2024-08-23 to 2024-08-29; classification:
Physics (grp_physics)::Astrophysics (astro-ph); include_cross_list: True; terms: AND all=astro-ph.EP; OR all=astroph.GA
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1. arXiv:2408.15229 [pdf, other]

astro-ph.GA

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astro-ph.HE

Why are optical coronal lines faint in active galactic nuclei?
Authors: Jeffrey D. McKaig, Shobita Satyapal, Ari Laor, Nicholas P. Abel, Sara M. Doan, Claudio Ricci, Jenna M. Cann
Abstract: Forbidden collisionally excited optical atomic transitions from high ionization potential (IP≥ 54.8\,eV) ions, such as Ca
4+ , Ne4+ , Fe6+ , Fe10+ , Fe13+ , Ar9+ , and S11+ , are known as optical coronal lines (CLs). The spectral energy distribution (SED)of active galactic nuclei (AGN) typically extends… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 21 pages, 6 figures, accepted for publication in The Astrophysical Journal

2. arXiv:2408.15214 [pdf, other]

astro-ph.GA

EDGE: Predictable Scatter in the Stellar Mass--Halo Mass Relation of Dwarf Galaxies
Authors: Stacy Y. Kim, Justin I. Read, Martin P. Rey, Matthew D. A. Orkney, Sushanta Nigudkar, Andrew Pontzen, Ethan Taylor,
Oscar Agertz, Payel Das
Abstract: The stellar-mass--halo-mass (SMHM) relation is central to our understanding of galaxy formation and the nature ofdark matter. However, its normalisation, slope, and scatter are highly uncertain at dwarf galaxy scales. In this paper, we
present DarkLight, a new semi-empirical dwarf galaxy formation model designed to robustly predict the SMHM relation for thesmallest galaxies. DarkLight harnesses… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 15 pages, 13 figures. Key results are summarized in Figures 3-6. To be submitted to MNRAS. Comments welcome!

3. arXiv:2408.15197 [pdf, other]

astro-ph.GA

astro-ph.CO

A Deep Dive into the NGC 741 Galaxy Group: Insights into a Spectacular Head-Tail Radio Galaxy
from VLA, MeerKAT, uGMRT and LOFAR
Authors: K. Rajpurohit, E. O'Sullivan, G. Schellenberger, M. Brienza, J. M. Vrtilek, W. Forman, L. P. David, T. Clarke, A. Botteon, F.
Vazza, S. Giacintucci, C. Jones, M. Brüggen, T. W. Shimwell, A. Drabent, F. Loi, S. I. Loubser, K. Kolokythas, I. Babyk, H. J. A.
Röttgering
Abstract: We present deep, wideband multifrequency radio observations (144 MHz− 8 GHz) of the remarkable galaxy group
NGC 741, which yield crucial insights into the interaction between the infalling head-tail radio galaxy (NGC 742) and the maingroup. Our new data provide an unprecedentedly detailed view of the NGC 741-742 system, including the shock cone,
disrupted jets from NGC 742, the long (∼ 255… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 26 pages, 15 figures, submitted to ApJ

4. arXiv:2408.15175 [pdf, other]

astro-ph.GA

A Yebes W band Line Survey towards an Unshocked Molecular Cloud of Supernova Remnant
3C391: Evidence of Cosmic-Ray-Induced Chemistry
Authors: Tian-Yu Tu, Prathap Rayalacheruvu, Liton Majumdar, Yang Chen, Ping Zhou, Miguel Santander-García
Abstract: Cosmic rays (CRs) have strong influences on the chemistry of dense molecular clouds (MCs). To study the detailed
chemistry induced by CRs, we conducted a Yebes W band line survey towards an unshocked MC (which we named as
3C391:NML) associated with supernova remnant (SNR) 3C391. We detected emission lines of 18 molecular species in total andestimated their column densities with local thermodynami… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 18 pages, 7 figures, accepted for publication in ApJ

5. arXiv:2408.15167 [pdf]math-phastro-ph.GA

math.OCOn some minimal characteristics in a model of a system of N particles with interaction
Authors: Igor Pavlov
Abstract: For the well-known model of a system of N particles with interaction (N-body problem), we consider the spatialproblem of finding the minimum of the function of the kinetic energy of a system on its phase space under conditions on its
size and angular momentum. Based on the solution to this problem, we prove that the minimum possible kinetic energy of asystem at the current value of its size can… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 26 pages

6. arXiv:2408.15137 [pdf, other]

astro-ph.EP

Warm Jupiters around M-dwarfs are great opportunities for extensive chemical, cloud and hazecharacterisation with JWST
Authors: Lucas Teinturier, Elsa Ducrot, Benjamin Charnay
Abstract: The population of short-period giant exoplanets around M-dwarf stars is slowly rising. These planets present an
extraordinary opportunity for atmospheric characterisation and defy our current understanding of planetary formation.
Furthermore, clouds and hazes are ubiquitous in warm exoplanets but their behaviour is still poorly understood. We study thecase of a standard warm Jupiter around a M-dw… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: Accepted for publication in Astronomy & Astrophysics. 7 pages, 4 figures and 6 figures in appendix

7. arXiv:2408.15123 [pdf, other]

astro-ph.EP

No Thick Atmosphere on the Terrestrial Exoplanet Gl 486b
Authors: Megan Weiner Mansfield, Qiao Xue, Michael Zhang, Alexandra S. Mahajan, Jegug Ih, Daniel Koll, Jacob L. Bean,
Brandon Park Coy, Jason D. Eastman, Eliza M. -R. Kempton, Edwin S. Kite, Jonathan Lunine
Abstract: A primary science goal for JWST is to detect and characterize the atmospheres of terrestrial planets orbiting M dwarfs(M-Earths). The existence of atmospheres on M-Earths is highly uncertain because their host stars' extended history of high
XUV irradiation may act to completely remove their atmospheres. We present two JWST secondary eclipse observations of the
M-Earth Gl 486b (also known as GJ 4… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 13 pages, 6 figures, submitted to ApJL

8. arXiv:2408.15095 [pdf, ps, other]

astro-ph.HE

astro-ph.GA

An Eddington Limited Accretion Disk Wind in the narrow line Seyfert 1, PG 1448+273
Authors: J. N. Reeves, V. Braito, A. Luminari, D. Porquet, M. Laurenti, G. Matzeu, A. Lobban, S. Hagen
Abstract: PG 1448+273 is a luminous, nearby (z = 0.0645 ), narrow line Seyfert 1 galaxy, which likely accretes close to the
Eddington limit. Previous X-ray observations of PG 1448 with XMM-Newton in 2017 and NuSTAR in 2022 revealed the presenceof an ultra fast outflow, as seen through its blueshifted iron K absorption profile, where the outflow velocity appeared to vary in
the range 0.1 − 0.3c . In this work… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 15 pages, accepted for publication in the Astrophysical Journal

9. arXiv:2408.15067 [pdf, other]

astro-ph.SR

astro-ph.EP

astro-ph.GA

Systematic search for cool hypervelocity stars in multi-epoch WISE data
Authors: Sergey Karpov, Oleg Malkov, Alexandra Avdeeva
Abstract: Sixty years after the discovery of brown dwarfs, the search for these objects continues, particularly in the vicinity of
the Sun. Objects near the Sun are characterized by large proper motions, making them seen as fast-moving objects. While theGaia DR3 catalogue is a comprehensive source of proper motions, it lacks the depth needed for discovering fainter objects.
Modern multi-epoch surveys, with… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: Table 1 is available online at https://zenodo.org/records/13362690. Submitted to A&A

10. arXiv:2408.15025 [pdf, other]

astro-ph.EP

physics.space-phSimulating the Evolution of Lethal Non-Trackable Population and its Effect on LEO Sustainability
Authors: Daniel Jang, Richard Linares
Abstract: The vast majority of the orbital population today is unobservable and untracked because of their small size. Theselethal non-trackable objects will only become more numerous as more payloads and debris are launched into orbit andincrease the collision rate. In this paper, the long-term effect of collisions is simulated with an efficient Monte-Carlo method tosimulate the future LEO environment i… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 22 pages, 16 figures

11. arXiv:2408.14965 [pdf, other]

astro-ph.EP

astro-ph.IM

Planetary radio interferometry and Doppler experiment as an operational component of theJupiter Icy Moons Explorer mission
Authors: Vidhya Pallichadath, Dominic Dirkx, Marie S. Fayolle, Sandor Frey, Leonid I. Gurvits, Paul Boven, Giuseppe Cimo, Judit
Fogasy, Guifre Molera Calves, Krisztina Perger, N. Masdiana Md Said, Bert L. A. Vermeersen
Abstract: We present an overview of the operations and engineering interface for Planetary Radio Interferometry and Doppler
Experiment (PRIDE) radio astronomy observations as a scientific component of the ESA s Jupiter Icy Moons Explorer (JUICE)
mission, as well as other prospective planetary and space science missions. The article discusses advanced scheduling andplanning methods that make it possible to… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: 34 pages

12. arXiv:2408.14900 [pdf, other]

astro-ph.SR

astro-ph.GA

Stellar model tests and age determination for RGB stars from the APO-K2 catalogue
Authors: G. Valle, M. Dell'Omodarme, P. G. Prada Moroni, S. Degl'Innocenti
Abstract: By adopting the recently empirically derived dependence of α -elements on [α/Fe] instead of the conventionallyapplied uniform one, we tested the agreement between stellar model predictions and observations for red giant branch (RGB)
stars in the APO-K2 catalogue. We particularly focused on the biases in effective temperature scales and on the robustness ofage estimations. We computed a… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: Accepted for publication in A&A. Full Table 2 is only available online at CDS

13. arXiv:2408.14854 [pdf, other]

astro-ph.HE

astro-ph.GA

Distance estimation of gamma-ray emitting BL Lac objects from imaging observations
Authors: K. Nilsson, V. Fallah Ramazani, E. Lindfors, P. Goldoni, J. Becerra González, J. A. Acosta Pulido, R. Clavero, J. OteroSantos, T. Pursimo, S. Pita, P. M. Kouch, C. Boisson, M. Backes, G. Cotter, F. D'Ammando, E. Kasai
Abstract: Direct redshift determination of BL Lac objects is highly challenging as the emission in the optical and near-infrared(NIR) bands is largely dominated by the non-thermal emission from the relativistic jet that points very close to our line of sight.
Therefore, their optical spectra often show no emission lines from the host galaxy. In this work, we aim to overcome thisdifficulty by attempting to… ▽ More
Submitted 27 August, 2024; originally announced August 2024.

14. arXiv:2408.14799 [pdf]physics.space-ph

astro-ph.EP

astro-ph.SR

physics.plasm-phInterplanetary Causes and Impacts of the 2024 May Superstorm on the Geosphere: An
Overview
Authors: Rajkumar Hajra, Bruce Tsatnam Tsurutani, Gurbax Singh Lakhina, Quanming Lu, Aimin Du
Abstract: The recent superstorm of 2024 May 10-11 is the second largest geomagnetic storm in the space age and the only one
that has simultaneous interplanetary data (there were no interplanetary data for the 1989 March storm). The May superstorm
was characterized by a sudden impulse (SI+) amplitude of +88 nT, followed by a three-step storm main phase development
which had a total duration of ~9 hr. The cau… ▽ More
Submitted 27 August, 2024; originally announced August 2024.
Comments: Accepted for publication in The Astrophysical Journal

15. arXiv:2408.14725 [pdf, ps, other]

astro-ph.EP

A synchronous moon as a possible cause of Mars' initial triaxiality
Authors: Michael Efroimsky
Abstract: The paper addresses the possibility of a young Mars having had a massive moon, which synchronised the rotation ofMars, and gave Mars an initial asymmetric triaxiality to be later boosted by geological processes. It turns out that a moon ofless than a third of the lunar mass was capable of producing a sufficient initial triaxiality. The asymmetry of the initial tidal
shape of the equator depends… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Submitted to JGR Planets

16. arXiv:2408.14694 [pdf, other]

astro-ph.EP\textit{Searching for GEMS:} Characterizing Six Giant Planets around Cool Dwarfs
Authors: Shubham Kanodia, Arvind F. Gupta, Caleb I. Canas, Lia Marta Bernabo, Varghese Reji, Te Han, Madison Brady, Andreas
Seifahrt, William D. Cochran, Nidia Morrell, Ritvik Basant, Jacob Bean, Chad F. Bender, Zoe L. de Beurs, Allyson Bieryla, Alexina
Birkholz, Nina Brown, Franklin Chapman, David R. Ciardi, Catherine A. Clark, Ethan G. Cotter, Scott A. Diddams, Samuel
Halverson, Suzanne Hawley, Leslie Hebb , et al. (20 additional authors not shown)
Abstract: Transiting giant exoplanets around M-dwarf stars (GEMS) are rare, owing to the low-mass host stars. However, the allsky coverage of TESS has enabled the detection of an increasingly large number of them to enable statistical surveys like the\textit{Searching for GEMS} survey. As part of this endeavour, we describe the observations of six transiting giant planets,
which includes precise mass meas… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Accepted in AJ

17. arXiv:2408.14660 [pdf, other]

astro-ph.GA

astro-ph.SR

Assessing realistic binding energies of some essential interstellar radicals with amorphous solid
water: A fully quantum chemical approach
Authors: Milan Sil, Arghyadeb Roy, Prasanta Gorai, Naoki Nakatani, Takashi Shimonishi, Kenji Furuya, Natalia Inostroza-Pino,
Paola Caselli, Ankan Das
Abstract: In the absence of laboratory data, state-of-the-art quantum chemical approaches can provide estimates on thebinding energy (BE) of interstellar species with grains. Without BE values, contemporary astrochemical models are compelled toutilize wild guesses, often delivering misleading information. Here, we employ a fully quantum chemical approach to estimate
the BE of 7 diatomic radicals - CH, NH,… ▽ More
Submitted 26 August, 2024; originally announced August 2024.

18. arXiv:2408.14647 [pdf, other]doi

astro-ph.GA

10.3847/1538-4357/ad70b6

KBSS-InCLOSE I: Design and First Results from the Inner CGM of QSO Line Of Sight Emitting
Galaxies at z~2-3
Authors: Evan Haze Nunez, Charles C. Steidel, Evan N. Kirby, Gwen C. Rudie, Nikolaus Z. Prusinski, Yuguang Chen, Zhuyun
Zhuang, Allison L. Strom, Dawn K. Erb, Max Pettini, Louise Welsh, Dave S. N. Rupke, Ryan J. Cooke
Abstract: We present the design and first results of the Inner Circumgalactic Medium (CGM) of QSO Line of Sight Emitting
galaxies at z ∼ 2 − 3 , KBSS-InCLOSE. The survey will connect galaxy properties (e.g., stellar mass M ∗ , interstellar medium ISM
metallicity) with the physical conditions of the inner CGM (e.g., kinematics, metallicity) to directly observe the galaxy-scale
baryon cycle. We obtain deep… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 37 pages (48 total), 14 figures (20 total), Accepted to ApJ

19. arXiv:2408.14639 [pdf, other]

astro-ph.EP

Europa's H2 O2 : Temperature Insensitivity and a Correlation with CO2
Authors: Peiyu Wu, Samantha K. Trumbo, Michael E. Brown, Katherine de Kleer
Abstract: H2 O2 is part of Europa's water-ice radiolytic cycle and a potential source of oxidants to Europa's subsurface ocean.
However, factors controlling the concentration of this critical surface species remain unclear. Though laboratory experimentssuggest that Europa's H2 O2 should be concentrated in the coldest, most ice-rich regions toward the poles, Keck adaptive optics
observations have… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 17 pages, 4 figures, Accepted to the Planetary Science Journal

20. arXiv:2408.14605 [pdf, other]

astro-ph.HE

astro-ph.GA

New supernova remnant candidates in the LOFAR Two Metre Sky Survey
Authors: K. Tsalapatas, M. Arias, T. Shimwell, K. Rajwade, M. J. Hardcastle, A. Drabent
Abstract: In spite of their key role in galaxy evolution and several decades of observational efforts, the census of supernova
remnants (SNRs) in our Galaxy remains incomplete. Theoretical predictions based on the local supernova rate estimate theexpected number of SNRs in the Galaxy to be ≳ 1000. By contrast, the number of detected SNRs amounts to about 300. Highresolution, wide-area radio survey… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Accepted in A&A

21. arXiv:2408.14592 [pdf, other]

astro-ph.GA

Massive star cluster formation III. Early mass segregation during cluster assembly
Authors: Brooke Polak, Mordecai-Mark Mac Low, Ralf S. Klessen, Simon Portegies Zwart, Eric P. Andersson, Sabrina M. Appel,
Claude Cournoyer Cloutier, Simon C. O. Glover, Stephen L. W. McMillan
Abstract: Mass segregation is seen in many star clusters, but whether massive stars form in the center of a cluster or migrate
there dynamically is still debated. N-body simulations have shown that early dynamical mass segregation is possible when subclusters merge to form a dense core with a small crossing time. However, the effect of gas dynamics on both the formation anddynamics of the stars could inhi… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Submitted to A&A. 8 pages, 4 figures

22. arXiv:2408.14591 [pdf, other]

astro-ph.GA

Bursts of star formation and radiation-driven outflows produce efficient LyC leakage fromdense compact star clusters
Authors: Shyam H. Menon, Blakesley Burkhart, Rachel S. Somerville, Todd A. Thompson, Amiel Sternberg
Abstract: The escape of LyC photons emitted by massive stars from the dense interstellar medium of galaxies is one of themost significant bottlenecks for cosmological reionization. The escape fraction shows significant scatter between galaxies, andanisotropic, spatial variation within them, motivating further study of the underlying physical factors responsible for thesetrends. We perform numerical radia… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 21 pages, 10 figures. Submitted to ApJ. Comments welcome!

23. arXiv:2408.14546 [pdf, other]

astro-ph.GA

The Extended Mapping Obscuration to Reionization with ALMA (Ex-MORA) Survey: 5σ Source
Catalog and Redshift Distribution
Authors: Arianna S. Long, Caitlin M. Casey, Jed McKinney, Jorge A. Zavala, Hollis B. Akins, Olivia R. Cooper, Matthieu Bethermin
Erini L. Lambrides, Maximilien Franco, Karina Caputi, Jaclyn B. Champagne, Allison W. S. Man, Ezequiel Treister, Sinclaire M.
Manning, David B. Sanders, Margherita Talia, Manuel Aravena, D. L. Clements, Elisabete da Cunha, Andreas L. Faisst, Fabrizio
Gentile, Jacqueline Hodge, Gabriel Brammer, Marcella Brusa, Steven L. Finkelstein, Seiji Fujimoto , et al. (19 additional authors
not shown)
Abstract: One of the greatest challenges in galaxy evolution over the last decade has been constraining the prevalence ofheavily dust-obscured galaxies in the early Universe. At z > 3 , these galaxies are increasingly rare, and difficult to identify as
they are interspersed among the more numerous dust-obscured galaxy population at z = 1 − 3 , making efforts to secure
confident spectroscopic redshifts expensiv… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 13 pages, 5 figures, submitted to ApJ; fully reduced mosaic will be shared upon publication

24. arXiv:2408.14545 [pdf, other]

astro-ph.GA

H+
3 absorption and emission in local U/LIRGs with JWST/NIRSpec: Evidence for high H2ionization rates
Authors: Miguel Pereira-Santaella, Eduardo González-Alfonso, Ismael García-Bernete, Fergus R. Donnan, Miriam G. SantaMaria, Javier R. Goicoechea, Isabella Lamperti, Michele Perna, Dimitra Rigopoulou
Abstract: We study the 3.4-4.4µ m fundamental rovibrational band of H3+, a key tracer of the ionization of the molecularinterstellar medium (ISM), in a sample of 12 local (d< 400 Mpc) ultra/luminous infrared galaxies (U/LIRGs) observed with
JWST/NIRSpec. The P, Q, and R branches of the band are detected in 13 out of 20 analyzed regions within these U/LIRGs, which
increases the number of extragalactic H3+… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Accepted for publication in A&A Letters. 6 pages, 5 figures. Appendix: 5 pages, 4 figures

25. arXiv:2408.14541 [pdf, ps, other]

astro-ph.GA

The potential for long-lived intermediate mass black hole binaries in the lowest density dwarf
galaxies
Authors: Fazeel Mahmood Khan, Fiza Javed, Kelly Holley-Bockelmann, Lucio Mayer, Peter Berczik, Andrea V. Macciò
Abstract: Intermediate Mass Black Hole (IMBH) mergers with masses 104 − 106 M ⊙ are expected to produce gravitational
waves (GWs) detectable by the Laser Interferometer Space Antenna (LISA) with high signal to noise ratios out to redshift 20.
IMBH mergers are expected to take place within dwarf galaxies, however, the dynamics, timescales, and effect on their hosts
are largely unexplored. In a pr… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Submitted to ApJ

26. arXiv:2408.14534 [pdf, other]

astro-ph.GA

Sequential formation of supermassive stars and heavy seed BHs through the interplay of
cosmological cold accretion and stellar radiative feedback
Authors: Masaki Kiyuna, Takashi Hosokawa, Sunmyon Chon
Abstract: Supermassive stars (SMSs) and heavy seed black holes, as their remnants, are promising candidates forSupermassive Black Hole (SMBH) progenitors, especially for ones observed in the early universe z ≃ 8.5 − 10 by recent JWST
observations. Expected cradles of SMSs are the atomic cooling halos (M halo ≃ 107 M ⊙ ), where "cold accretion" emerges andpossibly forms SMSs. We… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 19 pages, 15 figures, submitting in MNRAS

27. arXiv:2408.14497 [pdf, other]

astro-ph.IM

astro-ph.EP

astro-ph.GA

astro-ph.HE

astro-ph.SR

Key Science Goals for the Next Generation Very Large Array (ngVLA): Update from the ngVLA
Science Advisory Council (2024)
Authors: David J. Wilner, Brenda C. Matthews, Brett McGuire, Jennifer Bergner, Fabian Walter, Rachel Somerville, Megan
DeCesar, Alexander van der Horst, Rachel Osten, Alessandra Corsi, Andrew Baker, Edwin Bergin, Alberto Bolatto, Laura Blecha,
Geoff Bower, Sarah Burke-Spolaor, Carlos Carrasco-Gonzalez, Katherine de Keller, Imke de Pater, Mark Dickinson, Maria Drout,
Gregg Hallinan, Bunyo Hatsukade, Andrea Isella, Takuma Izumi , et al. (10 additional authors not shown)
Abstract: In 2017, the next generation Very Large Array (ngVLA) Science Advisory Council, together with the international
astronomy community, developed a set of five Key Science Goals (KSGs) to inform, prioritize and refine the technicalcapabilities of a future radio telescope array for high angular resolution operation from 1.2 - 116 GHz with 10 times thesensitivity of the Jansky VLA and ALMA. The resul… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 29 pages, 9 figures, ngVLA memo 125. arXiv admin note: text overlap with arXiv:1711.09960

28. arXiv:2408.14447 [pdf, other]

astro-ph.SR

astro-ph.EP

astro-ph.GA

astro-ph.IM

Discovery of 118 New Ultracool Dwarf Candidates Using Machine Learning Techniques
Authors: Hunter Brooks, Dan Caselden, J. Davy Kirkpatrick, Yadukrishna Raghu, Charles Elachi, Jake Grigorian, Asa Trek, Andrew
Washburn, Hiro Higashimura, Aaron Meisner, Adam Schneider, Jacqueline Faherty, Federico Marocco, Christopher Gelino,
Jonathan Gagné, Thomas Bickle, Shih-yun Tang, Austin Rothermich, Adam Burgasser, Marc J. Kuchner, Paul Beaulieu, John Bell,
Guillaume Colin, Giovanni Colombo, Alexandru Dereveanco , et al. (22 additional authors not shown)
Abstract: We present the discovery of 118 new ultracool dwarf candidates, discovered using a new machine learning tool,
named \texttt{SMDET}, applied to time series images from the Wide-field Infrared Survey Explorer. We gathered photometricand astrometric data to estimate each candidate's spectral type, distance, and tangential velocity. This sample has aphotometrically estimated spectral class distribut… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 14 pages, 8 figures, 2 tables, extended table 1, accepted to American Astronomical Journal

29. arXiv:2408.14417 [pdf, other]

astro-ph.GA

Filamentary Molecular Cloud Formation via Collision-induced Magnetic Reconnection in Cold
Neutral Medium
Authors: Shuo Kong, Rowan J. Smith, David Whitworth, Erika T. Hamden
Abstract: We have investigated the possibility of molecular cloud formation via the Collision-induced Magnetic Reconnection(CMR) mechanism of the cold neutral medium (CNM). Two atomic gas clouds with conditions typical of the CNM were set tocollide at the interface of reverse magnetic fields. The cloud-cloud collision triggered magnetic reconnection and produced agiant 20pc filamentary structure which wa… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: accepted by ApJ

30. arXiv:2408.14351 [pdf, other]

astro-ph.GA

astro-ph.HE

Can supernova from runaway stars mimic the signs of absorbing `super-virial' gas?
Authors: Mukesh Singh Bisht, Projjwal Banerjee, Biman B. Nath, Yuri Shchekinov
Abstract: The recent detection of large column density absorption lines from highly ionized gas in a few directions through thecircumgalactic medium (CGM) of the Milky Way (MW) has been puzzling. The inferred temperature from these absorption lines
far exceeds the virial temperature of the MW, and the column densities are also too large to be easily explained. In this paper,
we propose a novel idea to expl… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 14 pages, submitted to the Astrophysical Journal (ApJ)

31. arXiv:2408.14344 [pdf, other]

astro-ph.GA

On the origin of the 107 K hot emitting gas in the Circumgalactic medium of the Milky Way
Authors: Mukesh Singh Bisht, Biman B. Nath, Smita Mathur
Abstract: The presence of the ≈ 106 K gas in the circumgalactic medium of the Milky Way has been well established. However,the location and the origin of the newly discovered hot gas at `super-virial' temperatures of ≈ 107 K have been puzzling. Thishot gas has been detected in both absorption and emission; here we focus on the emitting gas only. We show that both the`virial' and the `su… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 11 pages, accepted for publication in the Astrophysical Journal (ApJ)

32. arXiv:2408.14300 [pdf, other]

astro-ph.HE

astro-ph.GA

astro-ph.IM

XRISM Spectroscopy of the Fe Kα Emission Line in the Seyfert AGN NGC 4151 Reveals the Disk,
Broad Line Region, and Torus
Authors: XRISM Collaboration
Abstract: We present an analysis of the first two XRISM/Resolve spectra of the well-known Seyfert-1.5 active galactic nucleus in
NGC 4151, obtained in December 2023. Our work focuses on the nature of the narrow Fe Kα emission line at 6.4 keV, thestrongest and most common X-ray line observed in AGN. The total line is found to consist of three components. Even the
narrowest component of the line is resolv… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Accepted for publication in ApJ Letters

33. arXiv:2408.14297 [pdf, other]

astro-ph.GA

astro-ph.HE

X-ray AGN in Boötes: Black Hole - Galaxy assembly in massive populations
Authors: Paloma Guetzoyan, James Aird, Antonis Georgakakis, Alison L. Coil, Cassandra Barlow-Hall, Ryan C. Hickox, Amy L.
Rankine, Bryan A. Terrazas
Abstract: Supermassive Black Holes (BHs) are known to efficiently grow through gas accretion, but even sustained and intense
mass build-up through this mechanism struggles to explain the assembly of the most massive BHs observed in the local
Universe. Using the Chandra Deep-Wide Field Survey (CDFWS) in the Boötes field, we measure BH-galaxy assembly in massive
galaxies (… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 20 pages, 11 figures, submitted to MNRAS

34. arXiv:2408.14286 [pdf, other]

astro-ph.IM

astro-ph.EP

Revisiting the Borde-Traub focal plane wavefront estimation technique for exoplanet direct
imaging
Authors: Axel Potier, A J Eldorado Riggs, Garreth Ruane, Phillip K. Poon, Matthew Noyes, Greg W. Allan, Alexander B. Walter,
Camilo Mejia Prada, Raphael Galicher, Johan Mazoyer, Pierre Baudoz
Abstract: Direct imaging of exoplanets relies on complex wavefront sensing and control architectures. In addition to fast
adaptive optics systems, most of the future high-contrast imaging instruments will soon be equipped with focal plane
wavefront sensing algorithms. These techniques use the science detector to estimate the static and quasi-static aberrations
induced by optical manufacturing defects and sy… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Proceedings of SPIE Astronomical Telescopes + Instrumentation, Tokyo (2024)

35. arXiv:2408.14280 [pdf, other]

astro-ph.GA

Hydrostatic mass of galaxy clusters within some theories of gravity
Authors: Feri Apryandi, M. Lawrence Pattersons
Abstract: The mass of galaxy clusters (GCs) can be determined by calculating the hydrostatic equilibrium equation. In this work,
we revisit the derivation of hydrostatic mass of GCs within modified emergent Newtonian gravity (MENG) with generalized
uncertainty principle (GUP) correction, Eddington-inspired Born-Infeld (EiBI) theory, and beyond Horndeski gravity (BHG). We
apply the formulations on the masses… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 18 pages, 3 figures, 1 table

36. arXiv:2408.14276 [pdf, other]

astro-ph.EP

astro-ph.SR

SO as shock tracer in protoplanetary disks: the AB Aurigae case
Authors: A. Dutrey, E. Chapillon, S. Guilloteau, Y. W. Tang, A. Boccaletti, L. Bouscasse, Th. Collin-Dufresne, E. Di Folco, A. Fuente,
V. Piétu, P. Rivière-Marichalar, D. Semenov
Abstract: {Sulfur Monoxide is known to be a good shock tracer in molecular clouds and protostar environments, but its
abundance is difficult to reproduce even using state-of-the-art astrochemical models. } {We investigate the properties of theobserved SO emission in the protoplanetary disk of AB Auriga, a Herbig Ae star of 2.4 $\Msun$ located at 156 pc. The AB Aur
system is unique because it exhibits a d… ▽ More
Submitted 26 August, 2024; originally announced August 2024.

37. arXiv:2408.14268 [pdf, other]

astro-ph.EP

astro-ph.IM

astro-ph.SR

Efficiently Searching for Close-in Companions around Young M Dwarfs using a Multi-year PSF
Library
Authors: Aniket Sanghi, Jerry Xuan, Jason Wang, Dimitri Mawet, Brendan Bowler, Henry Ngo, Marta Bryan, Garreth Ruane,
Olivier Absil, Elsa Huby
Abstract: We present Super-RDI, a unique framework for the application of reference star differential imaging (RDI) to
Keck/NIRC2 high-contrast imaging observations with the vortex coronagraph. Super-RDI combines frame selection and signalto-noise ratio (S/N) optimization techniques with a large multi-year reference point spread function (PSF) library to achieve
optimal PSF subtraction at small angular sep… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Accepted to AJ. 41 pages, 13 figures, 4 tables. Data presented in this work: https://doi.org/10.5281/zenodo.12747613

38. arXiv:2408.14231 [pdf, other]

astro-ph.EP

astro-ph.GA

astro-ph.IM

Simulating Gravitational Microlensing Events by TESS: Predictions on Statistics and Properties
Authors: Sedighe Sajadian, Atousa Kalantari, Hossein Fatheddin, Somayeh Khakpash
Abstract: We study the statistics and properties of microlensing events that can be detected by the Transiting Exoplanet Survey
Satellite(TESS) based on Monte Carlo simulations. We simulate potential microlensing events from a sample of the TESS
Candidate Target List(CTL) stars by assuming different observational time spans(or different numbers of sectors for each star)
and a wide range of lens masses, i.e.… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 15 pages, 7 Figures

39. arXiv:2408.14149 [pdf, other]

astro-ph.EP

Spectro-photometry of Phobos simulants: II. Effects of porosity
Authors: Antonin Wargnier, Olivier Poch, Giovanni Poggiali, Thomas Gautier, Alain Doressoundiram, Pierre Beck, Tomoki
Nakamura, Hideaki Miyamoto, Shingo Kameda, Nathalie Ruscassier, Arnaud Buch, Pedro H. Hasselmann, Robin Sultana, Eric
Quirico, Sonia Fornasier, Antonella Barucci
Abstract: Surface porosity has been found to be an important property for small bodies. Some asteroids and comets can
exhibit an extremely high surface porosity in the first millimeter layer. This layer may be produced by various processes andmaintained by the lack of an atmosphere. However, the influence of porosity on the spectro-photometric properties of small
body surfaces is not yet fully understood.… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Submitted to Icarus

40. arXiv:2408.14142 [pdf, other]

astro-ph.CO

astro-ph.GA

Cosmic dance in the Shapley Concentration Core II. The uGMRT-MeerKAT view of filaments inthe brightest cluster galaxies and tailed radio galaxies in the A3528 cluster complex
Authors: G. Di Gennaro, T. Venturi, S. Giacintucci, M. Brüggen, E. Bulbul, J. Sanders, A. Liu, X. Zhang, K. Trehaeven, D. Dallacasa,
P. Merluzzi, T. Pasini, S. Bardelli, G. Bernardi, O. Smirnov
Abstract: Superclusters are the largest-scale environments where a number of galaxy clusters interact with each other throughminor/major mergers and grow via accretion along cosmic filaments. We focus on the A3528 complex in the core of the ShapleySupercluster. This system includes three clusters, A3528 (composed itself by two sub-clusters, namely A3528N and A3528S),
A3532 and A3530, and presents a mildly… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 28 pages, 23 figures and 5 tables; accepted for publication in Astronomy & Astrophysics

41. arXiv:2408.14128 [pdf, ps, other]

astro-ph.GA

Large diffuse dwarfs in the dynamically cold triple system
Authors: I. D. Karachentsev, A. E. Nazarova, V. E. Karachentseva
Abstract: We report on the discovery of three large diffuse dwarf (LDD) galaxies located in isolated triple systems. They haveeffective diameters of (3.6-10.0) kpc and effective surface brightness of (26.2--27.3)m / sq.arcsec. We note that the LDD galaxies
tend to occur in small groups with a very low dispersion of radial velocities. The total (orbital) mass of the triplets approximately
equals to their i… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: accepted for publication in Astrophysics, 9 pages, 1 figure, 5 tables

42. arXiv:2408.14095 [pdf, other]

astro-ph.GA

Morphology of molecular clouds at kiloparsec scale in the Milky Way: Shear-induced alignment
and vertical confinement
Authors: Yi-Heng Xie, Guang-Xing Li, Bing-Qiu Chen
Abstract: The shape of the cold interstellar molecular gas is determined by several processes, including self-gravity, tidal force,
turbulence, magnetic field, and galactic shear. Based on the 3D dust extinction map derived by Vergely et al., we identify asample of 550 molecular clouds (MCs) within 3 kpc of the solar vicinity in the Galactic disk. Our sample contains clouds whose
size ra… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Accepted by APJ

43. arXiv:2408.14078 [pdf, other]

astro-ph.HE

astro-ph.GA

Superluminal proper motion in the X-ray jet of Centaurus A
Authors: David Bogensberger, Jon M. Miller, Richard Mushotzky, W. N. Brandt, Elias Kammoun, Abderahmen Zoghbi, Ehud
Behar
Abstract: The structure of the jet in Cen A is likely better revealed in X-rays than in the radio band, which is usually used toinvestigate jet proper motions. In this paper, we analyze Chandra ACIS observations of Cen A from 2000 to 2022 and develop
an algorithm for systematically fitting the proper motions of its X-ray jet knots. Most of the knots had an apparent propermotion below the detection limit.… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: 24 pages, 14 figures, accepted for publication in ApJ

44. arXiv:2408.14044 [pdf, other]

astro-ph.GA

astro-ph.SR

Evidence for the Hierarchical Formation of the Galactic Disk in the Solar Neighborhood
Authors: Yu-Fu Shen, Zhuohan Li
Abstract: According to the hierarchical clustering scenario, galaxies like the Milky Way form hierarchically, and many supporting
evidences have been found in the Galactic halo. However, most stars in the Milky Way are disk stars. Disk stars have almost losttheir spatial distribution and kinematic features at birth, retaining solely chemical signatures. Identifying such substructuresusing abundances of ir… ▽ More
Submitted 26 August, 2024; originally announced August 2024.

45. arXiv:2408.14005 [pdf, other]

astro-ph.GA

The Calibration of Polycyclic Aromatic Hydrocarbon Dust Emission as a Star Formation Rate
Indicator in the AKARI NEP Survey
Authors: Helen Kyung Kim, Matthew A. Malkan, Toshinobu Takagi, Nagisa Oi, Denis Burgarella, Takamitsu Miyaji, Hyunjin Shim,
Hideo Matsuhara, Tomotsugu Goto, Yoichi Ohyama, Veronique Buat, Seong Jin Kim
Abstract: Polycyclic aromatic hydrocarbon (PAH) dust emission has been proposed as an effective extinction-independent starformation rate (SFR) indicator in the mid-infrared (MIR), but this may depend on conditions in the interstellar medium. The
coverage of the AKARI/Infrared Camera (IRC) allows us to study the effects of metallicity, starburst intensity, and active galactic
nuclei on PAH emission in gala… ▽ More
Submitted 26 August, 2024; originally announced August 2024.
Comments: Accepted for publication in The Astrophysical Journal. 50 pages, 27 figures, 9 tables

46. arXiv:2408.13842 [pdf, other]

astro-ph.CO

astro-ph.GA

DESI Peculiar Velocity Survey -- Fundamental Plane
Authors: Khaled Said, Cullan Howlett, Tamara Davis, John Lucey, Christoph Saulder, Kelly Douglass, Alex G. Kim, Anthony
Kremin, Caitlin Ross, Greg Aldering, Jessica Nicole Aguilar, Steven Ahlen, Segev BenZvi, Davide Bianchi, David Brooks, Todd
Claybaugh, Kyle Dawson, Axel de la Macorra, Biprateep Dey, Peter Doel, Kevin Fanning, Simone Ferraro, Andreu Font-Ribera,
Jaime E. Forero-Romero, Enrique Gaztañaga , et al. (30 additional authors not shown)
Abstract: The Dark Energy Spectroscopic Instrument (DESI) Peculiar Velocity Survey aims to measure the peculiar velocities of
early and late type galaxies within the DESI footprint using both the Fundamental Plane and Tully-Fisher relations. Direct
measurements of peculiar velocities can significantly improve constraints on the growth rate of structure, reducing uncertainty
by a factor of approximately 2.5… ▽ More
Submitted 25 August, 2024; originally announced August 2024.
Comments: 18 pages, 9 figures, 2 tables. Submitted for publication in MNRAS

47. arXiv:2408.13841 [pdf, other]

astro-ph.GA

astro-ph.HE

Bipolar blobs as evidence of hidden AGN activities in the low-mass galaxies
Authors: Yao Yao, Enci Wang, Zhicheng He, Zheyu Lin, Yu Rong, Hong-Xin Zhang, Xu Kong
Abstract: We report the evidence of a hidden black hole (BH) in a low-mass galaxy, MaNGA 9885-9102, and provide a new
method to identify active BH in low mass galaxies. This galaxy is originally selected from the MaNGA survey with distinctive
bipolar Hα blobs at the minor axis. The bipolar feature can be associated with AGN activity, while the two blobs are classified
as the H II regions on the BPT diagra… ▽ More
Submitted 25 August, 2024; originally announced August 2024.
Comments: 15 pages, 11 figures, accepted in ApJL

48. arXiv:2408.13763 [pdf, other]

astro-ph.GA

Characterisation of local halo building blocks: Thamnos and Sequoia
Authors: Emma Dodd, Tomás Ruiz-Lara, Amina Helmi, Carme Gallart, Thomas M. Callingham, Santi Cassisi, Emma FernándezAlvar, Fransisco Surot
Abstract: A crucial aspect of galaxy evolution is the pace at which galaxies build up their mass. We can investigate thishierarchical assembly by uncovering and timing accretion events that our galaxy has experienced. In the Milky Way, accreted
debris has been previously identified in the local halo, thanks to the advent of Gaia data. We aim to couple this dataset withadvancements in colour-magnitude diag… ▽ More
Submitted 25 August, 2024; originally announced August 2024.
Comments: 22 pages, 18 figures, submitted to A&A

49. arXiv:2408.13680 [pdf, other]

astro-ph.EP

Modeling Spitzer 3.6 and 4.5 µ m Eclipse Depths for the Inflated Hot Jupiter in the Evolved
Binary System HD 202772
Authors: Arthur D. Adams, Kimberly Bott, Paul A. Dalba, Tara Fetherolf, Stephen R. Kane, Ian Crossfield, Drake Deming, Diana
Dragomir, Varoujan Gorjian, Laura Kreidberg, Farisa Y. Morales, Michael W. Werner
Abstract: As an inflated Hot Jupiter orbiting an early-type primary star in the evolved binary HD 202772 system, HD 202772 A
b's presence invites a study of how such a planet forms and evolves. As a prelude to potential atmospheric characterization
with the latest generation of observatories, we present a reduction and analysis of eclipse light curve observations of HD
202772 A b acquired with the Spitzer S… ▽ More
Submitted 24 August, 2024; originally announced August 2024.
Comments: 17 pages, 7 figures, accepted for publication in AAS Journals

50. arXiv:2408.13636 [pdf, ps, other]

astro-ph.GA

Gravity or turbulence? VI. The physics behind the Kennicutt-Schmidt relations
Authors: Javier Ballesteros-Paredes, Manuel Zamora-Avilés, Carlos Román-Zúñiga, Aina Palau, Bernardo Cervantes-Sodi, Karla
Gutiérrez-Dávila, Vianey Camacho, Eric Jiménez-Andrade, Adriana Gazol
Abstract: We explain the large variety of star formation laws in terms of one single, simple law that can be inferred from thedefinition of the star formation rate and basic algebra. The resulting equation, $\SFR = \eff\ \Mcollapsing/\tauff$ , although it
has been presented elsewhere, is interpreted in terms of clouds undergoing collapse { rather than being turbulence-supported,
an idea that different group… ▽ More
Submitted 24 August, 2024; originally announced August 2024.
Comments: 17 pages, one figure. Accepted by MNRAS

51. arXiv:2408.13618 [pdf]astro-ph.GA

doi

10.1093/mnras/stae1820

Influence of selection criteria on the interpretation of rotational behaviour of wide-binary starsystems
Authors: Stephen Cookson
Abstract: Binary star systems are expected to follow Newtonian dynamics similarly to planetary systems. However, reports
have been made of wide binary systems with separations around 0.01 pc and larger, showing potential deviations fromstandard Newtonian motion. This phenomenon, suggestive of the flattening of galactic rotation curves, calls for closer
inspection. This study presents an analysis of wide bi… ▽ More
Submitted 24 August, 2024; originally announced August 2024.
Comments: 10 pages, 6 figures

52. arXiv:2408.13607 [pdf, other]

astro-ph.GA

Search and analysis of giant radio galaxies with associated nuclei (SAGAN) V. Study of giant
double-double radio galaxies from LoTSS DR2
Authors: Pratik Dabhade, Kshitij Chavan, D. J. Saikia, Martijn S. S. L. Oei, Huub J. A. Rottgering
Abstract: To test the hypothesis that megaparsec-scale giant radio galaxies (GRGs) have multiple epochs of recurrent activity
which lead to their giant sizes and to understand the nature of double-double radio galaxies (DDRGs), we have built the largest
sample of giant DDRGs from the LOFAR Two Metre Sky Survey (LoTSS). The sample consists of 111 sources, of which 76 are
newly identified. Their redshift and… ▽ More
Submitted 24 August, 2024; originally announced August 2024.
Comments: Submitted to A&A journal. 24 Pages. Comments are welcome

53. arXiv:2408.13572 [pdf, other]

astro-ph.GA

X-ray observations of Blueberry galaxies
Authors: B. Adamcová, J. Svoboda, E. Kyritsis, K. Kouroumpatzakis, A. Zezas, P. G. Boorman, A. Borkar, M. Bílek, M. Clavel, P. -O.
Petrucci
Abstract: Compact star-forming galaxies were dominant galaxy types in the early Universe. Blueberry galaxies (BBs) represent
their local analogues being very compact and having intensive star formation. Motivated by high X-ray emission recently foundin other analogical dwarf galaxies, called Green Peas, we probe into the X-ray properties of BBs to determine if their X-ray
emission is consistent with the em… ▽ More
Submitted 24 August, 2024; originally announced August 2024.
Comments: 10 pages, 4 + 1 (appendix) figures, accepted for publication in Astronomy & Astrophysics on 9.8.2024

54. arXiv:2408.13536 [pdf, other]

astro-ph.EP

Four HD 209458 b transits through CRIRES+: Detection of H2 O and non-detections of C2 H2 , CH4, and HCN
Authors: D. Blain, R. Landman, P. Mollière, J. Dittmann
Abstract: HD 209458 b is one of the most studied exoplanets to date. Despite this, atmospheric characterisation studies
yielded inconsistent species detections and abundances. Values reported for the C/O ratio range from 0.1 to 1.0. Of particularinterest is the simultaneous detection of H2O and HCN reported by some studies using high-resolution ground-based
observations, which would require the atmospheric… ▽ More
Submitted 24 August, 2024; originally announced August 2024.
Comments: 15 pages, 13 figures, 5 tables, accepted for publication in Astronomy & Astrophysics

55. arXiv:2408.13469 [pdf, other]

astro-ph.GA

A simple model of the radio-infrared correlation depending on gas surface density and redshift
Authors: Ilsang Yoon
Abstract: We introduce a simple parametric model of the radio-infrared correlation (i.e., the ratio between the IR luminosity
and the 1.4 GHz radio luminosity, q \tiny IR ) by considering the energy loss rate of high-energy cosmic ray (CR) electron
governed by the radiative cooling (synchrotron, bremsstrahlung, inverse Compton scattering), ionization, and adiabatic
expansion. Each process of CR el… ▽ More
Submitted 24 August, 2024; originally announced August 2024.
Comments: 13 pages, 6 figures, accepted for publication in ApJ

56. arXiv:2408.13398 [pdf]astro-ph.EP

Buto Facula, Ganymede: Palimpsest Exemplar
Authors: Jeffrey M. Moore, Oliver L. White, Donald G. Korycansky, Paul M. Schenk, Andrew J. Dombard, Martina L. Caussi
Abstract: Nowhere in the solar system are impact morphologies observed in greater variety than on the icy Galilean satellites.
This is likely a consequence of the structural and thermal state of the crust at the time of impact, and perhaps impact velocity.
Palimpsest-type impact features show smooth enclosed central plains surrounded by undulating plains, within which are
distributed concentric arcuate ridg… ▽ More
Submitted 23 August, 2024; originally announced August 2024.

57. arXiv:2408.13396 [pdf, other]

astro-ph.GA

Unveiling galaxy chemical enrichment mechanisms out to cosmic dawn from direct
determination of O & Ar abundances from JWST/NIRSPEC spectroscopy
Authors: Souradeep Bhattacharya, Magda Arnaboldi, Ortwin Gerhard, Chiaki Kobayashi, Kanak Saha
Abstract: Galaxy chemical enrichment mechanisms have primarily been constrained by [α /Fe] and [Fe/H] measurements ofindividual stars and integrated light from stellar populations. However such measurements are limited at higher redshifts (z>1).
Recently, we proposed an analogous diagram of the oxygen-to-argon abundance ratio, log(O/Ar), vs Ar abundance,
12+log(Ar/H), as a new diagnostic window for emissi… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 11 Pages, 3 Figures and 2 Tables; Submitted to ApJ Letters

58. arXiv:2408.13353 [pdf, other]

astro-ph.GA

Feedback?

SearchCounter-Rotation and Slow Precession in Aligned Eccentric Nuclear Disks due to Gravitational
Wave Recoil Kicks
Authors: Jane C. Bright, Tatsuya Akiba, Ann-Marie Madigan
Abstract: The M31 nucleus contains a supermassive black hole embedded in a massive stellar disk of apsidally-aligned
eccentric orbits. It has recently been shown that this disk is slowly precessing at a rate consistent with zero. Here wedemonstrate using N-body methods that apsidally-aligned eccentric disks can form with a significant (~0.5) fraction of orbits
counter-rotating as the result of a gravitatio… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: Accepted to MNRAS Letters

59. arXiv:2408.13340 [pdf, other]

astro-ph.EP

JWST Thermal Emission of the Terrestrial Exoplanet GJ 1132b
Authors: Qiao Xue, Jacob L. Bean, Michael Zhang, Alexandra S. Mahajan, Jegug Ih, Jason D. Eastman, Jonathan I. Lunine, Megan
Weiner Mansfield, Brandon P. Coy, Eliza M. -R. Kempton, Daniel D. Koll, Edwin S. Kite
Abstract: We present thermal emission measurements of GJ 1132b spanning 5--12 um obtained with the Mid-Infrared
Instrument Low-Resolution Spectrometer (MIRI/LRS) on the James Webb Space Telescope (JWST). GJ 1132b is an M-dwarf rocky
planet with Teq=584 K and an orbital period of 1.6 days. We measure a white-light secondary eclipse depth of 140+/-17 ppm,
which corresponds to a dayside brightness temperature… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: Accepted by ApJL

60. arXiv:2408.13318 [pdf, ps, other]

astro-ph.SR

astro-ph.EP

astro-ph.IM

Earths within Reach: Evaluation of Strategies for Mitigating Solar Variability using 3.5 years of
NEID Sun-as-a-Star Observations
Authors: Eric B. Ford, Chad F. Bender, Cullen H. Blake, Arvind F. Gupta, Shubham Kanodia, Andrea S. J. Lin, Sarah E. Logsdon,
Jacob K. Luhn, Suvrath Mahadevan, Michael L. Palumbo III, Ryan C. Terrien, Jason T. Wright, Jinglin Zhao, Samuel Halverson,
Emily Hunting, Paul Robertson, Arpita Roy, Gudmundur Stefansson
Abstract: We present the results of Sun-as-a-star observations by the NEID Solar Telescope at WIYN Observatory, spanning
January 1, 2021 through June 30, 2024. We identify 117,060 observations which are unlikely to be significantly affected byweather, hardware or major calibration issues. We describe several high-level data products being made available to thecommunity to aid in the interpretation and int… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 25 pages, 14 figures. Submitted to AAS Journals. Data release archived at https://zenodo.org/doi/10.5281/zenodo.13363761

61. arXiv:2408.13312 [pdf, other]

astro-ph.GA

The Ultraviolet Slopes of Early Universe Galaxies: The Impact of Bursty Star Formation, Dust,and Nebular Continuum Emission
Authors: Desika Narayanan, Daniel P. Stark, Steven L. Finkelstein, Paul Torrey, Qi Li, Fergus Cullen, Micheal W. Topping,Federico Marinacci, Laura V. Sales, Xuejian Shen, Mark Vogelsberger
Abstract: JWST has enabled the detection of the UV continuum of galaxies at z>10, evidencing a population of extremely blue,
potentially dust-free galaxies. Interpreting the UV spectra of galaxies as they redden is complicated by the well-known
degeneracy between stellar ages, dust, and nebular continuum. The main goal of this paper is to develop a theoretical modelfor the relationship between galaxy UV sl… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: Submitted to ApJ; comments welcome

62. arXiv:2408.13311 [pdf, other]

astro-ph.GA

A Break In the Size-Stellar Mass Relation: Evidence for Quenching and Feedback in Dwarf
Galaxies
Authors: Nushkia Chamba, Pamela M. Marcum, Amélie Saintonge, Alejandro S. Borlaff, Matthew J. Hayes, Valentin J. M. Le
Gouellec, S. Drew Chojnowski, Michael N. Fanelli
Abstract: Mapping stars and gas in nearby galaxies is fundamental for understanding their growth and the impact of theirenvironment. This issue is addressed by comparing the stellar "edges" of galaxies Dstellar , defined as the outermost diameter
where in situ star formation significantly drops, with the gaseous distribution parameterized by the neutral atomic hydrogen
diameter measured at 1… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 19 pages, 10 figures, 2 tables. Key results in Figs. 4, 6, 7 and 8. Accepted for publication in The Astrophysical Journal

63. arXiv:2408.13308 [pdf, other]

astro-ph.EP

A Comprehensive Analysis Spitzer 4.5 µ m Phase Curve of Hot Jupiters
Authors: Lisa Dang, Taylor J. Bell, Ying, Shu, Nicolas B. Cowan, Jacob L. Bean, Drake Deming, Eliza M. -R. Kempton, Megan
Weiner Mansfield, Emily Rauscher, Vivien Parmentier, Kevin B. Stevenson, Mark Swain, Laura Kreidberg, Tiffany Kataria, JeanMichel Désert, Robert Zellem, Jonathan J. Fortney, Nikole K. Lewis, Michael Line, Caroline Morley, Adam Showman
Abstract: Although exoplanetary science was not initially projected to be a substantial part of the Spitzer mission, its exoplanet
observations set the stage for current and future surveys with JWST and Ariel. We present a comprehensive reduction andanalysis of Spitzer's 4.5 micron phase curves of 29 hot Jupiters on low-eccentricity orbits. The analysis, performed with the
Spitzer Phase Curve Analysis (SPC… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 16 pages, 6 figures, submitted to AAS journal

64. arXiv:2408.13307 [pdf, other]

astro-ph.EP

astro-ph.SR

Two Novel Hot Jupiter Formation Pathways: How White Dwarf Kicks Shape the Hot Jupiter
Population
Authors: Alexander P. Stephan, David V. Martin, Smadar Naoz, Nathan R. Hughes, Cheyanne Shariat
Abstract: The origin of Hot Jupiters (HJs) is disputed between a variety of in situ and ex situ formation scenarios. One of theearly proposed ex situ scenarios was the Eccentric Kozai-Lidov (EKL) mechanism combined with tidal circularization, which can
produce HJs with the aid of a stellar or planetary companion. However, observations have revealed a lack of stellar companions
to HJs, which challenges the… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: Submitted to ApJL. Comments are welcome

65. arXiv:2408.13144 [pdf, other]

astro-ph.HE

astro-ph.GA

gr-qc

Constraining binary mergers in AGN disks using the non-observation of lensed gravitational
waves
Authors: Samson H. W. Leong, Justin Janquart, Aditya Kumar Sharma, Paul Martens, Parameswaran Ajith, Otto A. Hannuksela
Abstract: The dense and dynamic environments within active galactic nuclei (AGN) accretion disks may serve as prolificbirthplaces for binary black holes (BBHs) and one possible origin for some of the BBHs detected by gravitational-wave (GW)
observatories. We show that a considerable fraction of the BBH in AGN disks will be strongly lensed by the central
supermassive black hole (SMBH). Thus, the non-observa… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 8 pages, 4 figures
Report number: LIGO DCC - P2400346

66. arXiv:2408.13141 [pdf, other]

astro-ph.GA

physics.chem-phdoi

10.1039/D4CP01301H

Laser-induced fragmentation of coronene cations
Authors: S. Panchagnula, J. Kamer, A. Candian, H. R. Hrodmarsson, H. Linnartz, J. Bouwman, A. G. G. M. Tielens
Abstract: Polycyclic aromatic hydrocarbons are an important component of the interstellar medium of galaxies andphotochemistry plays a key role in the evolution of these species in space. Here, we explore the photofragmentation behaviourof the coronene cation (C24H12+) using time of flight mass spectrometry. The experiments show photodissociation
fragmentation channels including the formation of bare carb… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 17 pages, 12 figure. Version submitted after referee report to PCCP. Supplementary information available athttps://www.rsc.org/suppdata/d4/cp/d4cp01301h/d4cp01301h1.pdf
Journal ref: Phys. Chem. Chem. Phys., 2024,26, 18557-18570

67. arXiv:2408.13077 [pdf, other]

astro-ph.HE

astro-ph.GA

The Radio Spectra of High Luminosity Compact Symmetric Objects (CSO-2s): Implications for
Studies of Compact Jetted Active Galactic Nuclei
Authors: P. V. de la Parra, A. C. S Readhead, T. Herbig, S. Kiehlmann, M. L. Lister, V. Pavlidou, R. A. Reeves, A. Siemiginowska, A.
G. Sullivan, T. Surti, A. Synani, K. Tassis, G. B. Taylor, P. N. Wilkinson, M. F. Aller, R. D. Blandford, N. Globus, C. R. Lawrence, B.
Molina, S. O'Neill, T. J. Pearson
Abstract: This paper addresses, for the first time, a key aspect of the phenomenology of Compact Symmetric Objects (CSOs) -the characteristics of their radio spectra. We present a radio-spectrum description of a complete sample of high luminosity
CSOs (CSO-2s), which shows that they exhibit the \textit{complete} range of spectral types, including flat-spectrum sources (α ≥ −0.5 ), steep-spectrum sources… ▽ More
Submitted 23 August, 2024; originally announced August 2024.

68. arXiv:2408.13076 [pdf, other]

astro-ph.HE

astro-ph.GA

astro-ph.SR

The rates and host galaxies of pair-instability supernovae through cosmic time: Predictions
from BPASS and IllustrisTNG
Authors: Max M. Briel, Benjamin Metha, Jan J. Eldridge, Takashi J. Moriya, Michele Trenti
Abstract: Pair-instability supernovae (PISNe) have long been predicted to be the final fates of near-zero-metallicity very massive
stars (Z < Z ⊙ /3 , M ZAMS ≳ 140M ⊙ ). However, no definite PISN has been observed to date, leaving theoretical modelling
validation open. To investigate the observability of these explosive transients, we combine detailed stellar evolu… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: Accepted 2024 August 23 in Monthly Notices of the Royal Astronomical Society

69. arXiv:2408.13072 [pdf, other]

astro-ph.GA

astro-ph.IM

physics.chem-phdoi

10.1039/D4CP01247J

Photofragmentation of Corannulene (C20H10) and Sumanene (C21H12) cations in gas phaseand its Astrophysical implications
Authors: P. Sundararajan, A. Candian, J. Kamer, H. Linnartz, A. G. G. M. Tielens
Abstract: The aromatic infrared Bands (AIBs) dominate the mid-infrared spectra of many galactic and extragalactic sources.
These AIBs are generally attributed to fluorescent emission from aromatic molecules. Unified efforts from experimentalists andtheoreticians to assign these AIB features have recently gotten additional impetus with the launch of the James Webb Space
Telescope (JWST) as the Mid-InfraRed… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 17 pages, 12 figures. Version submitted after referee report to PCCP. Supplementary information available athttps://www.rsc.org/suppdata/d4/cp/d4cp01247j/d4cp01247j1.pdf
Journal ref: Phys. Chem. Chem. Phys., (2024), 26, 19332-19348

70. arXiv:2408.12977 [pdf, other]

gr-qc

astro-ph.GA

New series expansion method for the periapsis shift
Authors: Akihito Katsumata, Tomohiro Harada, Kota Ogasawara, Hayami Iizuka
Abstract: We propose a new series expansion method for the periapsis shift. The method formulates the periapsis shift invarious spacetimes analytically without using special functions and provides simple and highly accurate approximate formulae.
We derive new series representations for the periapsis shift in the Kerr and the Chazy-Curzon spacetimes by using the method,where the expansion parameter is defi… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 41 pages, 18 figures
Report number: RUP-24-14

71. arXiv:2408.12971 [pdf, other]

astro-ph.GA

astro-ph.SR

M giants with IGRINS IV. Identification and characterization of a near-IR line of the s-element
BariumAuthors: G. Nandakumar, N. Ryde, H. Hartman, G. Mace
Abstract: Neutron-capture elements represent an important nucleosynthetic channel in the study of the Galactic Chemical
Evolution of stellar populations. For stellar populations behind significant extinction, such as those in the Galactic Center andalong the Galactic plane, abundance analyses based on near-IR spectra are necessary. Previously, spectral lines from theneutron-capture elements such as copper… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 9 pages, 6 figures, Accepted for publication A&A

72. arXiv:2408.12969 [pdf, other]

astro-ph.GA

astro-ph.SR

Peering into the Heart of the Giant Molecular Cloud G148.24+00.41: A Deep Near-infrared Viewof the Newly Hatched Cluster FSR 655
Authors: Vineet Rawat, M. R. Samal, D. K. Ojha, Brajesh Kumar, Saurabh Sharma, J. Jose, Ram Sagar, R. K. Yadav
Abstract: We present a detailed near-infrared study of an embedded cluster located in the hub of the giant molecular cloudG148.24+00.41 of mass ∼ 105 M ⊙ , with the TANSPEC instrument mounted on the 3.6 m Devasthal Optical Telescope. The hub
is located near the geometric center of the cloud and represents its most massive clump. We studied the central 2 pc × 2 pc
area of the hub with 5… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 17 pages and 13 figures

73. arXiv:2408.12940 [pdf, other]

astro-ph.GA

astro-ph.CO

An Analytic Model of Gravitational Collapse Induced by Radiative Cooling: Instability Scale, Infall
Velocity, and Accretion Rate
Authors: James Gurian, Boyuan Liu, Donghui Jeong, Takashi Hosokawa, Shingo Hirano, Naoki Yoshida
Abstract: We present an analytic description of the spherically symmetric gravitational collapse of radiatively cooling gas
clouds. The approach is based on developing the "one-zone" density-temperature relationship of the gas into a full dynamical
model. We convert this density-temperature relationship into a barotropic equation of state, which we use to calculate thedensity and velocity profiles of the g… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 11+3 pages, 14+3 figures

74. arXiv:2408.12864 [pdf, other]

astro-ph.GA

FRB Line-of-sight Ionization Measurement From Lightcone AAOmega Mapping Survey: the First
Data Release
Authors: Yuxin Huang, Sunil Simha, Ilya Khrykin, Khee-Gan Lee, J. Xavier Prochaska, Nicolas Tejos, Keith Bannister, Jason
Barrios, John Chisholm, Jeff Cooke, Adam Deller, Marcin Glowacki, Lachlan Marnoch, Ryan Shannon, Jielai Zhang
Abstract: This paper presents the first public data release (DR1) of the FRB Line-of-sight Ionization Measurement From
Lightcone AAOmega Mapping (FLIMFLAM) Survey, a wide field spectroscopic survey targeted on the fields of 10 precisely
localized Fast Radio Bursts (FRBs). DR1 encompasses spectroscopic data for 10,468 galaxy redshifts across 10 FRBs fields withz<0.4, covering approximately 26 deg^2 of the s… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: 23 pages, 8 figures, Submitted to ApJSMSC Class: 85-11; 85A04; 85A25

75. arXiv:2408.12854 [pdf, other]

astro-ph.GA

Exploring Active Galactic Nuclei and Little Red Dots with the Obelisk simulation
Authors: M. Volonteri, M. Trebitsch, Y. Dubois, J. E. Greene, C. -A. Dong-Paez, M. Habouzit, A. Lupi, Y. Ma, R. S. Beckmann, P.
Dayal
Abstract: The James Webb Space telescope has discovered an abundant population of broad line emitters, typical signposts for
Active Galactic Nuclei (AGN). Many of these sources have red colors and a compact appearance that has led to naming them
`Little Red Dots'. In this paper we develop a detailed framework to estimate the photometry of AGN embedded in galaxies
extracted from the Obelisk cosmological simu… ▽ More
Submitted 23 August, 2024; originally announced August 2024.
Comments: Submitted to A&A

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