Sazuna/UAT_keywords huggingface dataset:
Flickering Returns as RS Oph Reestablishes Quiescent Conditions Following its 2021 Nova Outburst. RS Oph has persistently displayed flickering at optical wavelengths when observed away from its repeating nova outbursts. During the 2006 eruption the flickering disappeared, and this repeated during the recent 2021 event. We have been monitoring RS Oph looking for the reappearance of flickering at B-band following the 2021 outburst. The flickering was still absent (σ(B) &lt; 0.002 mag) on day +210 (counted from nova optical maximum), appeared at σ(B) = 0.008 mag on day +224, and raised to σ(B) = 0.029 mag on day +250. On following dates the amplitude remained large, although fluctuating. The recovery of B-band quiescence brightness by RS Oph begun around day +225 and was completed by day +260. The parallel patterns followed by the rise in system brightness and the reappearance of flickering confirm the central role played in RS Oph by the return to pre-outburst conditions of the accretion disk and the refilling by the RG wind of the immediate circumstellar space.

Keywords: Stellar accretion disks, Time series analysis, Symbiotic binary stars, Recurrent novae
Galactic Kites. I show that interstellar films of material thinner than a micron, drift away from the Galactic plane as a result of stellar radiation pressure. Such films, whether produced naturally by dust coagulation in proto-planetary disks or artificially by technological civilizations, would accumulate over the age of the Milky Way and hover above the Galactic disk at a scale-height set gravitationally by the dark matter halo. Limits on scattered starlight imply that this population carries a fraction below 2 × 10-3 of the interstellar medium mass.

Keywords: Interstellar dynamics
The Behavior of HgMn Stars in the Far UV -4: ι CrB A. The analysis of twelve high resolution SWP spectra of the HgMn star HD 143807 A (ι CrB A) obtained through the large aperture recorded by the International Ultraviolet Explorer reveals that the far-ultraviolet flux of this star remained constant over the various observations with IUE. The TESS lightcurve of ι CrB does not show evidence for periodic variability. The absence of far and mid-UV variability and the reproducibility of the brightness in the V band during the IUE observations precludes the presence of large chemical gradients over the surface of ι CrB at the epoch of the IUE observations. The analysis of six high resolution SOPHIE spectra obtained over three consecutive nights in 2007 March does not show any variations of the lines, either in reduced intensity nor in radial velocity.

Keywords: Chemically peculiar stars
Note on Fundamental Physics Tests from Black Hole Imaging: Comment on "Hunting for Extra Dimensions in the Shadow of Sagittarius A*". Several recent works have tested fundamental physics with horizon-scale black hole (BH) images, using the size r sh and deviation from circularity ${\rm{\Delta }}{ \mathcal C }$ of the BH shadow. For the Event Horizon Telescope image of Sgr A*, limits on ${\rm{\Delta }}{ \mathcal C }$ are not available due to the sparse interferometric coverage of the 2017 observations, alongside the short variability timescale of Sgr A* compared to M87*. We comment on the results of a recent preprint which purports to have derived new limits on extra dimensions using the deviation from circularity of Sgr A*'s shadow. The latter is quoted to be ≲10% as with M87*, based on the "similarity" of the two shadows, which however is an incorrect assumption. In the immediate future, the simplest tests of fundamental physics from Sgr A*'s image will mostly have to rely on r sh.

Keywords: Black hole physics, Astrophysical processes
Discovery of a New Massive ZZ Ceti Star. Massive pulsating white dwarf stars are extremely rare, because they are the final product of intermediate-mass stars, which are less common than low-mass stars. Additionally, their small size makes them fainter than the normal-mass white dwarf stars (~0.6 M ⊙). Our motivation to look for this type of variable is to be able to study in detail their internal structure and therefore derive properties for the outcome of the evolution of intermediate mass stars, below 10 M ⊙. Using the 2.1 m Otto Struve Telescope at McDonald Observatory, we report on the discovery of a new massive pulsating white dwarf star. These stars might be massive enough that their cores have a significant crystallized portion, up to about 50%. A detailed asteroseismic study of these stars will provide important constrains on intermediate-mass stellar evolution, and the opportunity to study solid state physics at extreme conditions.

Keywords: White dwarf stars, Asteroseismology, ZZ Ceti stars, Pulsating variable stars
A Linear Divider Between the Blue Sequence and Red Sequence in Color-Magnitude Space. We compute the optimal divider between the red sequence and blue sequence in the Sloan Digital Sky Survey Legacy Survey of galaxies. Within the luminosity range -18 &gt; M  r  &gt; -24, we find a good fit with a simple linear relation, u - r = 2.326-0.1305(M  r  + 21).

Keywords: Galaxy colors, Galaxy luminosities, Galaxy classification systems, Red sequence galaxies
VIDEO: Data Release 5. VIDEO is a deep near-infrared survey which targets 12deg2 over the ELAIS-S1 (2 continuous VIRCAM tiles), XMM-LSS, and E-CDFS (3 continuous VIRCAM tiles, each) extra-galactic fields. This research note presents the final data release (DR5) of all tiles, stacks and the deep stacked data in all areas, VIDEO-ES1, VIDEO-XMM and VIDEO-CDFS in Z, Y, J, H and Ks bands.

Keywords: Surveys, High-redshift galaxies, Infrared galaxies, Galaxies
The Platinum Abundance of ι CrB A. The analysis of six high resolution SOPHIE spectra obtained over three consecutive nights in 2007 March reveals the presence of a strong Pt II line at 4514.14 Å. Over the spectral range 4400 up to 4600 Å, the lines do not vary either in reduced intensity nor in radial velocity. Spectrum synthesis of this spectral range using updated atomic data yields abundances for helium (0.10 solar), magnesium (2 solar), titanium (2.20 solar), chromium (2.20 solar), manganese (28 solar), iron (1.2 solar), zirconium (80 solar), barium (15 solar) and platinum (2500 solar), which confirm the HgMn status for this star.

Keywords: Chemically peculiar stars, Chemical abundances
The NASA GSFC TESS Full Frame Image Light Curve Data Set. We present a data set containing the light curves of all stars brighter than 16th magnitude in the TESS full frame images from the primary mission (Years 1 and 2; Sectors 1-26). This includes a total of over 150 million light curves, making it the largest set of TESS light curves released to date.

Keywords: Light curves, Astronomy data reduction
How Have Astronomers Cited Other Fields in the Last Decade?. We present a citation pattern analysis between astronomical papers and 13 other disciplines, based on the arXiv database over the past decade (2010-2020). We analyze 12,600 astronomical papers citing over 14,531 unique publications outside astronomy. Two striking patterns are unraveled. First, general relativity recently became the most cited field by astronomers, a trend highly correlated with the discovery of gravitational waves. Second, the fast growth of referenced papers in computer science and statistics, the first with a notable 15 fold increase since 2015. Such findings confirm the critical role of interdisciplinary efforts involving astronomy, statistics, and computer science in recent astronomical research.

Keywords: Astroinformatics, Interdisciplinary astronomy, Astrostatistics
LTD064402+245919, Compact Binary or Subgiant with Red Star Eclipsing Binary?. Recently, a single-line spectroscopic binary, LTD064402+245919, has been discovered by Yang et al. Using data from LAMOST and ZTF, the unseen companion is estimated to have a mass of 1-3 M ⊙, orbiting a subgiant with orbital period of 14.50 days, making it a good compact binary candidate without X-ray emission. However, new light curves from ZTF and ASAS-SN, has shown the depth of one dip increases toward a bluer wavelength, indicating LTD064402+245919 is more likely to be a subgaint with a red star. Using both Wilson-Devinney code and Phoebe, the derived T eff of secondary is about 3400 K, corresponding to a red M2/3 star. Additionally, the 20% error of parallax from Gaia is large. The mass of subgiant will be 1.28 M ⊙ instead of 2.77 M ⊙, if the refined distance of 5.0 kpc is used. Nevertheless, new multi-color photometry are warranted for the final confirmation of binaries properties.

Keywords: Spectroscopic binary stars, Neutron stars, Stellar mass black holes, Semi-detached binary stars
On the Age of the Magnetar Inside GRB 130310A. The GRB 130310A has recently been reported to be due to magnetar giant flare. Unlikely gamma-ray bursts, the giant flare of magnetars are not assumed to be strongly beamed. This will change the estimation on the magnetar's magnetic field and age (about several hours).

Keywords: Magnetars, Radio pulsars
Using Stellar Rotation to Identify Tidally Stripped Members of the Praesepe Open Cluster. As an open cluster orbits the Milky Way, gravitational fields distort it, stripping stars from the core and forming tidal tails. Recent work has identified tidal tails of the Praesepe cluster; we explore rotation periods as a way to confirm these candidate members. In open clusters, the rotation period distribution evolves over time due to magnetic braking. Since tidally stripped stars originally formed within the cluster, they should follow the same period distribution as in the cluster core. We analyze 96 candidate members observed by NASA's Transiting Exoplanet Survey Satellite mission. We measure reliable rotation periods for 32 stars, while 64 light curves are noise-dominated. The 32 newly identified rotators are consistent with the period distribution in the core, and with past membership in Praesepe. We therefore suggest that for nearby open clusters, stellar rotation offers a quick and inexpensive method for confirming past members dispersed into tidal tails.

Keywords: Open star clusters, Stellar rotation, Milky Way dynamics, Stellar dynamics
A Resolved Search for AGN in the Centers of Nearby Galaxies with WISE. We investigate the mid-infrared detection of active galactic nucleus (AGN) in nearby galaxies and the effects of contamination by starlight and dust emission from the host galaxy. We used a sample of ~14,000 nearby galaxies from the z = 0 Multiwavelength Galaxy Synthesis to study the effect of isolating the galaxy center on AGN detection. We identify 39 known AGN and 9 additional previously selected AGN candidates using color selection in WISE Bands 1 and 2. Most AGN identified using the smallest apertures around the nucleus are lost from the WISE color selection at larger aperture radii. This suggests that when low spatial resolution or integrated galaxy measurements are used to identify AGN in the mid-IR, lower luminosity AGN may go undetected due to contamination from the galaxy's dust emission and starlight.

Keywords: Infrared astronomy, Active galactic nuclei, Galaxy nuclei
Probing X-Ray Continua with Accretion-Disk Wind in Black Hole X-Ray Binaries. High energy coronal radiation in Black Hole X-Ray Binary sources is often absorbed by accretion disk winds and the resulting absorption signatures heavily depend on its ionizing spectral energy distribution (SED). Considering multiple ion absorbers in the wind (e.g. Fe XXV/XXVI, S XVI, Si XIV, Ca XX and Mg XII), we find that the relative strength of absorption among these ions in general sensitively depends on the shape of the SED. We calculate a series of absorption line spectra from radiative transfer process for 9 distinct SED. Furthermore, we simulate 50 ks XRISM/Resolve spectra for each SED. We then fit the spectra by two-parameter wind model (SED and wind density normalization) to examine whether or not absorption features imprinted by the wind can be uniquely mapped to the ionizing SED.

Keywords: X-ray astronomy, Black hole physics, Accretion, High energy astrophysics, Quasar absorption line spectroscopy, Spectroscopy, Radiative transfer simulations, Magnetohydrodynamical simulations
The Behavior of HgMn Stars in the Far UV -5: υ Her. The analysis of twelve high resolution SWP spectra of the HgMn star HD 144206 (υ Her) obtained through the large aperture recorded by the International Ultraviolet Explorer (IUE) reveals that the far ultraviolet flux of this star remained constant over the various observations with IUE, except for one spectrum. The increase of FUV flux in SWP 13513 and the simultaneous brightening of υ Her in the V band could reflect a flare similar to those reported in other late B-type stars. The analysis of two high resolution ELODIE spectra obtained four years apart does not show any variations of the lines, either in reduced intensity nor in radial velocity. The absence of far ultraviolet variability and the reproducibility of the brightness in the V band during most IUE observations do not support the presence of large chemical gradients over the surface of υ Her.

Keywords: Chemically peculiar stars, Chemical abundances
Quantum Tunneling of Fuzzy Dark Matter out of Satellite Galaxies. I show that the tidal gravitational potential of the Milky Way galaxy removes fuzzy dark matter from its satellite dwarf galaxies through quantum-mechanical tunneling. The existence of dark matter in satellites rules-out ultra-light axions as dark matter with a particle mass, m  a  &lt; 2 × 10-21 eV. This limit exceeds the canonical mass range proposed as a solution to the small-scale challenges of the cold-dark-matter paradigm.

Keywords: Cold dark matter
An Early Assessment of the Forecast by the Solar Cycle 25 Prediction Panel. The effects of solar activity on technology have increased the interest in solar forecasting both in the scientific community and in society. With two and a half years of data available, we are approximately halfway to the maximum of Solar Cycle 25. Several research groups around the world published their predictions for this cycle. In this work, we assess the forecast made by the Solar Cycle 25 Prediction Panel. Analyzing the sunspot number data available, we conclude that Solar Cycle 25 is one of the weakest cycles since mid-18th century and, however, it is stronger than the initial forecast of the highest range predicted by the Solar Cycle 25 Prediction Panel for the two first years and a half of its ascending phase.

Keywords: Solar cycle, Solar activity, Sunspot number
Could SNAD160 be a Pair-instability Supernova?. The SNAD team reports the discovery of SNAD160 (AT2018lzi) within the Zwicky Transient Facility third data release. The transient has been found using the active anomaly detection algorithm, an adaptive learning strategy aimed at incorporating expert knowledge into machine learning models. Our preliminary analysis shows that SNAD160 could be a superluminous supernova powered by a pair-instability mechanism-its light curve behavior is consistent with the observed slow rise and slow decay expected from these events.

Keywords: Astronomical object identification, Light curve classification , Transient sources, Transient detection, Supernovae, Time series analysis
X-Ray Obscuration around Supermassive Black Holes in Active Galaxies. We investigate obscuration of Active Galactic Nuclei (AGNs), identified as Supermassive Black Holes (BH) in luminous galaxies. In this model, winds of plasma particles launched from the accretion disk are photoionized by hard X-ray continua from the AGN's corona, resulting in obscuration in the X-ray band. Many X-ray spectroscopic observations suggest a majority of AGN are obscured by an intervening gas along our line of sight. Through photoionization calculations for selected wind solutions, we simulate the observed AGN obscuration distribution. We discuss the plausibility of the model by comparing our theoretical obscuration distribution to X-ray data by producing a library of synthetic absorption spectra of X-ray continua. Using our model's obscuration findings, we show how the obscuration distribution is dependent on the model parameters.

Keywords: Black hole physics, Radiative magnetohydrodynamics, High energy astrophysics, Broad-absorption line quasar, X-ray active galactic nuclei
V1674 Hercules: It is Blowing out a Wind. V1674 Her was not only the fastest nova on record, it was also a rare hybrid event, showing a transition between the Fe II and He/N nova classes as early as 5.5 days after the outburst. Spectra now indicate the outburst is over; emission lines from the underlying binary system are now seen, although broad but weaker forbidden nebular emission lines are also present. Intriguing at this late evolutionary stage is a P Cygni-like line profile associated with Hα suggesting the presence of a wind emanating from the binary system. The profile exhibits intensity and velocity variations perhaps correlated with its 0.153 day orbital period.

Keywords: Classical novae
APOGEE-centric Ananke Simulations in a SciServer SQL Database. Modern galaxy simulations have reached the complexity required to create sophisticated mock catalogs. Ananke is a set of nine mock catalogs constructed from synthetic surveys of three Milky Way-like galaxies from the Latte suite of FIRE simulations. Ananke provides observed quantities for comparison with modern large-scale stellar surveys. In SDSS-IV DR17, mock catalogs for the Apache Point Galactic Evolution Experiment (APOGEE) were built from Ananke synthetic surveys as a Value-Added Catalog, but were only provided as large flat files (~&gt;10's GB). Here we announce an &gt;40 Tb SQL database for nine APOGEE-specific mock catalogs and describe additions to the data model necessary for effective user queries. The catalogs can be accessed on the free, science platform, SciServer-supported by the Institute for Data Intensive Engineering and Science at the Johns Hopkins University (IDIES); SciServer supports server-side analysis with commonly used coding languages and tools.

Keywords: Astronomy databases, Surveys, Catalogs, Redshift surveys, Milky Way Galaxy
The Behavior of HgMn Stars in the Far-UV -6: κ Cnc. The analysis of eighteen high resolution SWP spectra of the HgMn star HD 78316 (κ Cnc) recorded by the International Ultraviolet Explorer reveals that the far-ultraviolet flux of this star remained constant over the various observations with IUE. The TESS lightcurve of HD 78316 reveals a double-wave structure with a rotational period of about 6.25 days. The absence of far-ultraviolet variability and the reproducibility of the brightness in the V band during most IUE observations do not support the presence of large chemical gradients over the surface of κ Cnc at the time of the IUE observations.

Keywords: Chemically peculiar stars
WDJ220838.73+454434.04: a White Dwarf Companion in the AR Lacertae System. We present WDJ220838.73+454434.04 (hereafter WD2208+454), a wide, co-moving white dwarf companion to the eclipsing binary system, AR Lacertae. The companion was discovered through the Backyard Worlds: Planet 9 citizen science collaboration. It has a separation of 21.″9 on the sky from the central eclipsing pair, translating to a projected separation of ~930 au. We present a review of the physical properties and orbital parameters of this new addition to the system.

Keywords: Eclipsing binary stars, White dwarf stars, Binary stars
galmask: A Python Package for Unsupervised Galaxy Masking. Galaxy morphological classification is a fundamental aspect of galaxy formation and evolution studies. Various machine learning tools have been developed for automated pipeline analysis of large-scale surveys, enabling a fast search for objects of interest. However, crowded regions in the image may pose a challenge as they can lead to bias in the learning algorithm. In this Research Note, we present galmask, an open-source package for unsupervised galaxy masking to isolate the central object of interest in the image. galmask is written in Python and can be installed from PyPI via the pip command.

Keywords: Astroinformatics, Astronomy software
No Detection of Sodium in the Atmosphere of the Warm Neptune HD 106315c. We analyzed archival data of the warm Neptune HD 106315c, an exoplanet with an extended atmosphere orbiting an F-type star with a 21 days period. We used data from the HARPS instrument covering three transits and employed the high-resolution transmission spectroscopy technique. Our analysis yielded a non-detection of sodium with an upper limit of 0.24% on the depth of the planetary feature. This can hint at the presence of Rayleigh scattering in the atmosphere and/or clouds in the upper atmosphere. The HD 106315 system with its two Neptune-sized planets remains an intriguing target for comparative planetology in the starting era of JWST and the upcoming Ariel mission.

Keywords: Exoplanets, Exoplanet atmospheres
Inferring the Gas-to-Dust Ratio in the Main Planet-forming Region of Disks. Measuring the amount of gas and dust in protoplanetary disks is a key challenge in planet formation studies. Here we provide a new set of dust depletion factors and relative mass surface densities of gas and dust for the innermost regions of a sample of protoplanetary disks. We do this by combining stellar theory with observed refractory element abundances in both disk hosts and open cluster stars. Our results are independent of, and complementary to, those obtained from spatially resolved disk observations.

Keywords: Stellar accretion disks, Stellar abundances, Protoplanetary disks, Circumstellar disks
The Behavior of HgMn Stars in the Far-UV-Paper 7: HR 6000. The analysis of nine high resolution SWP spectra of the chemically peculiar star HR 6000 recorded by the International Ultraviolet Explorer reveals low amplitude variations of the far-ultraviolet flux (about 15% at 1500 Å) over the various observations with IUE. These variations could be caused by horizontal gradients of abundances of chemical elements over the surface of HR 6000.

Keywords: Chemically peculiar stars
Principal Component Analysis in the Modeling of Colors of Comae of Comets Hale-Bopp and Tabur. The temporal variability of the colors of comae of comets has been reported for some decades. The color indices B-R of comets Hale-Bopp and Tabur were estimated with a variation of the model of Kolokolova et al., according to geometrical, populational, and compositional parameters of cometary dust. A principal component analysis of five model parameters points that the variation of these color indices is usually associated with changes in population or geometric parameters, and their extremes with a compositional variation of the dust grains.

Keywords: Long period comets, Broad band photometry, Small Solar System bodies, Coma dust
The Behavior of the Bp Star 36 Lynxis in the Far-UV. The analysis of twenty-four high resolution SWP spectra of the magnetic Bp star HD 79158 (36 Lynxis) recorded by the International Ultraviolet Explorer (IUE) reveals that the far-ultraviolet flux of this star mostly remained constant over the various observations with IUE. Only a few spectra show less flux shortwards of 1600 Å and enhanced line absorption compared to the mean spectrum, which could be interpreted as non uniform distribution of certain chemical elements over the surface of 36 Lynxis. The TESS lightcurve of HD 79158 reveals a complex structure with an estimated rotational period of about 3.832 ± 0.019 days, close to previous determinations.

Keywords: Chemically peculiar stars
Plasma Data Sources in the OMNI Database. The OMNI data set is a tool well situated for analysis with advanced machine learning (ML) and artificial intelligence (AI) techniques. Because OMNI incorporates data from multiple instruments and spacecraft, care must be taken when interpreting these results. We discuss the OMNI/Lo plasma data sources and one potential challenge with interpreting the results of ML and AI techniques when applied to it.

Keywords: Solar wind, Astronomy databases