Show simple item record

dc.contributor.authorGonzales, Eileen C.
dc.contributor.authorBurningham, Ben
dc.contributor.authorFaherty, Jacqueline K.
dc.contributor.authorVisscher, Channon
dc.contributor.authorMarley, Mark S.
dc.contributor.authorLupu, Roxana
dc.contributor.authorFreedman, Richard
dc.contributor.authorLewis, Nikole K.
dc.date.accessioned2022-01-18T14:30:03Z
dc.date.available2022-01-18T14:30:03Z
dc.date.issued2021-12-08
dc.identifier.citationGonzales , 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.issn0004-637X
dc.identifier.otherPURE: 26158908
dc.identifier.otherPURE UUID: dc83f0d3-0149-48aa-a11e-d74726b10f47
dc.identifier.otherArXiv: http://arxiv.org/abs/2109.11000v1
dc.identifier.otherScopus: 85121785403
dc.identifier.otherORCID: /0000-0003-4600-5627/work/106791598
dc.identifier.urihttp://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.abstractWe 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.extent14
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectastro-ph.SR
dc.subjectastro-ph.EP
dc.titleThe first retrieval of a substellar subdwarf: A cloud-free SDSS J125637.13-022452.4en
dc.contributor.institutionDepartment of Physics, Astronomy and Mathematics
dc.contributor.institutionSchool of Physics, Engineering & Computer Science
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
dc.relation.schoolSchool of Physics, Engineering & Computer Science
dcterms.dateAccepted2021-12-08
rioxxterms.versionAM
rioxxterms.versionofrecordhttps://doi.org/10.3847/1538-4357/ac294e
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record