dc.contributor.author | Kothari, Harshil | |
dc.contributor.author | Cushing, Michael C. | |
dc.contributor.author | Burningham, Ben | |
dc.contributor.author | Beiler, Samuel A. | |
dc.contributor.author | Kirkpatrick, J. Davy | |
dc.contributor.author | Schneider, Adam C. | |
dc.contributor.author | Mukherjee, Sagnick | |
dc.contributor.author | Marley, Mark S. | |
dc.date.accessioned | 2024-08-16T16:00:02Z | |
dc.date.available | 2024-08-16T16:00:02Z | |
dc.date.issued | 2024-08-12 | |
dc.identifier.citation | Kothari , H , Cushing , M C , Burningham , B , Beiler , S A , Kirkpatrick , J D , Schneider , A C , Mukherjee , S & Marley , M S 2024 , ' Probing the Heights and Depths of Y Dwarf Atmospheres : A Retrieval Analysis of the JWST Spectral Energy Distribution of WISE J035934.06$-$540154.6 ' , The Astrophysical Journal , vol. 971 , no. 121 . https://doi.org/10.3847/1538-4357/ad583b | |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2406.06493v1 | |
dc.identifier.other | ORCID: /0000-0003-4600-5627/work/165662655 | |
dc.identifier.uri | http://hdl.handle.net/2299/28104 | |
dc.description | © 2024. The Author(s). Published by the American Astronomical Society. This article is licensed under a Creative Commons Attribution 4.0 International License, To view a copy of this licence, visit https://creativecommons.org/licenses/by/4.0/ | |
dc.description.abstract | We present an atmospheric retrieval analysis of the Y0 brown dwarf WISE J035934.06$-$540154.6 using the low-resolution 0.96--12 $\mu$m JWST spectrum presented in \citet{Beiler_2023}. We obtain volume number mixing ratios of the major gas-phase absorbers (H$_2$O, CH$_4$, CO, CO$_2$, PH$_3$, and H$_2$S) that are 3--5$\times$ more precise than previous work that used HST spectra. We also find an order-of-magnitude improvement in the precision of the retrieved thermal profile, a direct result of the broad wavelength coverage of the JWST data. We used the retrieved thermal profile and surface gravity to generate a grid of chemical forward models with varying metallicity, (C/O)$_\textrm{atm}$, and strengths of vertical mixing as encapsulated by the eddy diffusion coefficient $K_\textrm{zz}$. Comparison of the retrieved abundances with this grid of models suggests that the deep atmosphere of WISE 0359$-$54 shows signs of vigorous vertical mixing with $K_\textrm{zz}=10^9$ [cm$^{2}$ s$^{-1}$]. To test the sensitivity of these results to our 5-knot spline thermal profile model, we performed a second retrieval using the \citet{Madhusudhan_2009} thermal profile model. While the results of the two retrievals generally agree well, we do find differences between the retrieved values of mass and volume number mixing ratio of H$_2$S with fractional differences of the median values of $-$0.64 and $-$0.10, respectively. In addition, the 5-knot thermal profile is consistently warmer at pressure between 1 and 70 bar. Nevertheless, our results underscore the power that the broad-wavelength infrared spectra obtainable with the James Webb Space Telescope have to characterize the atmospheres of cool brown dwarfs. | en |
dc.format.extent | 15 | |
dc.format.extent | 9491372 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | astro-ph.SR | |
dc.subject | astro-ph.EP | |
dc.title | Probing the Heights and Depths of Y Dwarf Atmospheres : A Retrieval Analysis of the JWST Spectral Energy Distribution of WISE J035934.06$-$540154.6 | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.3847/1538-4357/ad583b | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |