dc.contributor.author | Gonzales, Eileen C. | |
dc.contributor.author | Burningham, Ben | |
dc.contributor.author | Faherty, Jacqueline K. | |
dc.contributor.author | Visscher, Channon | |
dc.contributor.author | Marley, Mark S. | |
dc.contributor.author | Lupu, Roxana | |
dc.contributor.author | Freedman, Richard | |
dc.contributor.author | Lewis, Nikole K. | |
dc.date.accessioned | 2022-01-18T14:30:03Z | |
dc.date.available | 2022-01-18T14:30:03Z | |
dc.date.issued | 2021-12-08 | |
dc.identifier.citation | Gonzales , E C , Burningham , B , Faherty , J K , Visscher , C , Marley , M S , Lupu , R , Freedman , R & Lewis , N K 2021 , ' The first retrieval of a substellar subdwarf: A cloud-free SDSS J125637.13-022452.4 ' , The Astrophysical Journal , vol. 923 , no. 1 . https://doi.org/10.3847/1538-4357/ac294e | |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2109.11000v1 | |
dc.identifier.other | ORCID: /0000-0003-4600-5627/work/106791598 | |
dc.identifier.uri | http://hdl.handle.net/2299/25310 | |
dc.description | © 2021. The American Astronomical Society. All rights reserved. This is the accepted manuscript version of an article which has been published in final form at https://doi.org/10.3847/1538-4357/ac294e | |
dc.description.abstract | We present the first retrieval analysis of a substellar subdwarf, SDSS J125637.13-022452.4 (SDSS J1256-0224), using the Brewster retrieval code base. We find SDSS J1256-0224 is best fit by a cloud-free model with an ion (neutral H, H-, and electron) abundance corresponding to ion [Fe/H]=-1.5. However, this model is indistinguishable from a cloud-free model with ion [Fe/H]=-2.0 and a cloud-free model with ion Fe/H]=-1.5 assuming a subsolar carbon-to-oxygen ratio. We are able to constrain abundances for water, FeH, and CrH, with an inability to constrain any carbon-bearing species likely due to the low-metallicity of SDSS J1256-0224. We also present an updated spectral energy distribution (SED) and semi-empirical fundamental parameters. Our retrieval- and SED-based fundamental parameters agree with the Baraffe low-metallicity evolutionary models. From examining our "rejected" models (those with $\Delta$BIC>45), we find that we are able to retrieve gas abundances consistent with those of our best-fitting model. We find the cloud in these poorer fitting "cloudy" models is either pushed to the bottom of the atmosphere or made optically thin. | en |
dc.format.extent | 14 | |
dc.format.extent | 10699546 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | astro-ph.SR | |
dc.subject | astro-ph.EP | |
dc.title | The first retrieval of a substellar subdwarf: A cloud-free SDSS J125637.13-022452.4 | en |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Centre for Astrophysics Research | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.3847/1538-4357/ac294e | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |