adsabs/AstroCLIMB huggingface dataset:
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: The confident nondetection of CH4 at ∼3.4 μm in the NIRSpec/G395H spectrum drives our inference of a high-metallicity atmosphere, while the tentative SO2 feature suggests a low-C/O atmosphere on GJ 3090 b. Top panel: NIRSpec/G395H visit 1+2 transmission spectrum from exoTEDRF (gray points, used for retrieval) and the binned spectrum (black points), with representative atmosphere models. The purple line is the best-fitting chemically consistent model, while the pink model highlights the impact of lowering the metallicity to 1× solar (solid line: cloud-free model; dashed–dotted model: clouds at 1 mbar), and the blue model illustrates the expectation for a higher-C/O (C/O = 0.6) atmosphere. For the low-metallicity case, CH4, rather than H2O absorption, dominates over the wavelength range covered by the NRS1 detector. The color shadings illustrate the contributions of H2O, CO2, and SO2 to the model spectrum. Bottom panels: posterior distributions on the atmospheric C/O ratio and metallicity from the SCARLET chemical equilibrium retrieval (purple) as well as the ScCHIMERA equilibrium grid fits (1σ upper limit on the C/O ratio and 2σ lower limit on the metallicity quoted in orange). The left panel is the C/O ratio, with the 1σ, 2σ, and 3σ upper limits shown in different color shadings. The right panel is the joint posterior distribution on the atmospheric metallicity and cloud-top pressure (1σ, 2σ, and 3σ contours for the SCARLET retrievals outlined in black), which highlights that the small-amplitude features in our spectrum favor a high-metallicity atmosphere on GJ 3090 b.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: The effects of varying the atmosphere chemistry on the NIRSpec/G395H transmission spectrum of GJ 3090 b. Top: plotted in blue is the best-fit spectrum from the grid-based 1D-RCTE retrieval with ScCHIMERA. In purple and red are model spectra with the same parameters as the best-fit model but with M/H set to 100× solar or C/O set to 0.6, respectively. Bottom: models with adjusted Kzz, demonstrating that even a large degree of vertical mixing combined with a high internal temperature (in this case, plotted models assume Tint = 300 K, while our grid-based retrievals assume a lower Tint = 100 K) cannot sufficiently deplete CH4 even in a lower-metallicity atmosphere (C/O = 0.6, M/H = 100× solar) to match the lack of observed spectral features.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Comparison of derived orbital parameters using different data sets. The joint “überfit” uses all four observed transit white light curves, whereas the other four cases use the light curves from an individual visit. Three cases are shown for each fit: assuming a circular orbit, fixing the eccentricity to 0.15, and leaving the eccentricity free. The constraints from J. M. Almenara et al. (2022) are marked with gray shading. In general, NIRSpec prefers smaller values of a/R* and inclination (which are positively correlated). The joint fit values are consistent with the findings of J. M. Almenara et al. (2022), except in the case where we fix e = 0.15.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: exoTEDRF transmission spectra of GJ 3090 b from both NIRISS/SOSS visits. Visit 1 is displayed in blue and visit 2 in light green, and the differences between them are shown in the bottom panel in black.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Mass–radius curves for GJ 3090 b (Teq = 693 K) at varying core compositions (ice-rich, pure silicate rock, and Earth-like iron-to-rock ratio), envelope mass fractions (EMFs), and mass fractions of metals in the envelope (Zenv). The GASTLI models (solid lines) assume a miscible 1:1 ice and rock core, whereas the A. Aguichine et al. (2021) models (dashed and dotted lines) assume dry, pure rock (no Fe) and Earth-like (32% Fe) core compositions.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: NIRISS/SOSS relative helium light curve showing clear absorption during the transit for visit 1 (dark blue) and visit 2 (light green) and the two visits combined (black). The transit ingress and egress are marked with the vertical dotted lines. The relative light curve was computed by dividing the light curve that includes the He triplet by the average of the surrounding light curves (from 1.062 to 1.078 μm and from 1.088 to 1.105 μm).
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Pixel-level NIRISS/SOSS transmission spectrum of GJ 3090 b using the exoTEDRF pipeline in the wavelength range surrounding the He I triplet (gray dashed line). Our best fits to the data via three model considerations are (1) a Gaussian model of the He lines with a width dictated by the instrument resolution (orange), (2) a Gaussian for the instrument response convolved with the helium triplet line profiles treated as Lorentzians (dark red), and (3) a flat line (black).
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: exoTEDRF transmission spectra of GJ 3090 b from both NIRSpec/G395H visits. Visit 1 is displayed in the dark blue color and visit 2 in the light green color, and the differences between them are shown in the bottom panel in black.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Comparison of transmission spectra of GJ 3090 b from different reduction pipelines. Top left: Eureka! transmission spectra from both NIRSpec/G395H visits. Visit 1 is displayed in the darker purple color and visit 2 in the lighter orange color, and the differences between them are shown in the bottom panel in black. Bottom left: combined (visit 1 and visit 2) NIRSpec transmission spectra from Eureka! (orange) and exoTEDRF (turquoise). The latter reduction is vertically offset by their average difference of 40 ppm to allow for direct comparison. Top right: NAMELESS transmission spectra of GJ 3090 b from both NIRISS/SOSS visits. Visit 1 is displayed in orange and visit 2 in purple. The differences between the two visits are shown in the bottom panel in black, demonstrating a ∼30 ppm offset between the two visits. Bottom right: comparison of the NAMELESS (orange, purple) and exoTEDRF (turquoise, dark blue) transmission spectra for both NIRISS/SOSS visits.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Joint and marginalized posterior distributions for the main atmospheric absorbers that NIRSpec/G395H is sensitive to from the SCARLET (blue), POSEIDON (orange), and AURORA (green) retrievals performed on the visit 1+2 NIRSpec/G395H spectrum of GJ 3090 b. While POSEIDON marginalized over the potential contributions from unocculted spots, the SCARLET and AURORA results shown do not account for a TLS contribution, leading to overall higher water abundances. The contours correspond to 1σ and 2σ confidence (dark and light shading).
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Results from the TLS-only fits to the transmission spectrum of each NIRISS/SOSS visit of GJ 3090 b from the stctm retrievals. We show the best-fitting unocculted heterogeneity model (black), as well as the median and 1σ, 2σ, and 3σ ranges obtained from sample posterior spectra (color shading). The top panel showcases the results for the fit to the visit 1 spectrum, and the bottom panel is the same result for the visit 2 spectrum. We show the binned (four points together) points for each visit (black points), with no offset applied between order 1 and order 2. The NIRISS/SOSS spectrum of GJ 3090 b is well matched by stellar contamination alone, in line with the lack of information content on the atmosphere we obtain from joint TLS–atmosphere retrievals over this wavelength range.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Constraints on stellar surface heterogeneities for both NIRISS/SOSS visits from the out-of-transit stellar spectra. Top: flux-calibrated NIRISS/SOSS stellar spectra using only the out-of-transit integrations (visit 1, black; visit 2, green) and best-fitting three-component PHOENIX model spectra (visit 1, blue; visit 2, red). Two ∼0.2 μm wavelength ranges are shown zoomed in in the insets to better visualize the higher-resolution structures. Bottom: retrieved photosphere temperature, as well as spot and faculae temperatures and covering fractions. Posteriors for visit 1 are shown in blue and visit 2 in red. The out-of-transit results are broadly consistent with the in-transit analysis in Section 6.1.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Joint and marginalized posterior distributions from the TLS-only fits to the transmission spectrum of each NIRISS/SOSS visit of GJ 3090 b performed using stctm. The contours correspond to 1σ, 2σ, and 3σ limits, and the median and 1σ interval are highlighted on each marginalized posterior distribution. The results for visit 1 (2) are shown in blue (orange).
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Raw NRS2 white light curves for each NIRSpec/G395H without any integrations cut as a result of systematics (visit 1) or flares (visit 2). The gray shaded regions denote the integrations that are cut in the light-curve analysis presented in Section 3.1.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Midtransit times for each visit compared to a linear ephemeris propagated from visit 1. There is a slight trend to earlier times, with the final visit occurring approximately 1 minute earlier than would be expected from the linear ephemeris (though still consistent with zero with the propagated error), potentially suggesting some evidence for a nonzero orbital eccentricity or dynamical interactions with a potential planet c.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Visit 2: broadband (white) light curve of the transit of GJ 3090 b with a stellar flare (gray), using NIRSpec’s NRS1 and NRS2 detectors and the Eureka! pipeline. The black data points correspond to the flux binned (10 points) to aid visualization. The fits to both light curves are shown in red and include a transit model, a linear model, and a modified, asymmetric Lorentzian model to fit the flare. The residuals of the fits are shown in the bottom panel, displaying an offset in the data and the model after the flare.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Best-fit models from the SCARLET (blue), POSEIDON (orange), and Aurora (green) retrievals performed on the NIRSpec/G395H transmission spectrum of GJ 3090 b (gray points at R = 100, binned in black), corresponding to the posterior plot shown in Figure D1. The three models were smoothed to a resolving power of 250.
Paper: Escaping Helium and a Highly Muted Spectrum Suggest a Metal-enriched Atmosphere on Sub-Neptune GJ 3090 b from JWST Transit Spectroscopy
Authors: Eva-Maria Ahrer, Michael Radica, Caroline Piaulet-Ghorayeb, Eshan Raul, Lindsey Wiser, Luis Welbanks, Lorena Acuña, Romain Allart, Louis-Philippe Coulombe, Amy Louca, Ryan MacDonald, Morgan Saidel, Thomas M. Evans-Soma, Björn Benneke, Duncan Christie, Thomas G. Beatty, Charles Cadieux, Ryan Cloutier, René Doyon, Jonathan J. Fortney, Anna Gagnebin, Cyril Gapp, Hamish Innes, Heather A. Knutson, Thaddeus Komacek, Joshua Krissansen-Totton, Yamila Miguel, Raymond Pierrehumbert, Pierre-Alexis Roy, Hilke E. Schlichting
Figure caption: Top: the retrieved spectrum from the grid-based 1D-RCTE retrieval with ScCHIMERA. Shaded is the 1σ confidence region about the median model, plotted as a solid line. The blue points are the NRS1 points with the median retrieved instrument offset of 10.49 ppm. Bottom panels: the posterior probability density distributions for [M/H], where [] denotes log10 relative to solar, C/O, and the instrument offset on NIRSpec/G395H NRS1. Points with error bars denote the median and 1σ confidence region on each parameter. The red points show parameter constraints from the disequilibrium retrieval. Arrows mark the 2σ lower limit for M/H and the 1σ preference for C/O.
Paper: X-Ray Polarimetric Observations of the Western Hotspot of Pictor A
Authors: Stefano Tugliani, Francesco Massaro, Michela Negro, Raffaella Bonino, Nicolò Cibrario, Luca Latronico, Simone Maldera, Alessandro Paggi, Andrea Tramacere, Eileen T. Meyer, Ioannis Liodakis, Herman L. Marshall, Eric S. Perlman
Figure caption: Top panel: polarization degree, Π, as a function of the ratio between the ordered and the random magnetic field components, ρ = Bord/Brand. Dashed blue and dashed–dotted orange lines show Π(ρ) for models from V. L. Ginzburg & S. I. Syrovatskii (1965) and M. Errando et al. (2024), respectively. The maximum Π from synchrotron radiation in a uniform magnetic field, with a random distribution of the pitch angles, is also shown in red (G. B. Rybicki & A. P. Lightman 1979) (the red band indicates the ±1σ error for this value on the basis of our results). Horizontal blue and green lines represent the upper limits we obtained from the IXPE data for the standard XSPEC analysis and for the MLE-based method, respectively. Finally, the purple line represents the value for the maximum Π in the SSC scenario using Πseed = 50% (η = 1) as measured, where optical and X-ray emission are cospatial, which can be ruled out using the 1D results, i.e., polarization aligned to the jet position angle. Bottom panel: polarization degree (Π) as a function of the angle Φ for different test values of ρ following the models in R. A. Laing (1980) and K. Nalewajko & M. Sikora (2012). The optical polarization degree Πopt ≥ 50% (R. C. Thomson et al. 1995) would imply a too high Φ compared to the upper limit (45°) derived by M. J. Hardcastle et al. (2016) for the scenario assuming only a random magnetic field in a compressed region (ρ = 0). The magnetic field is thus mainly ordered.