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dc.contributor.authorLine, Michael R.
dc.contributor.authorTeske, Johanna
dc.contributor.authorBurningham, Ben
dc.contributor.authorFortney, Jonathan
dc.contributor.authorMarley, Mark
dc.date.accessioned2017-07-13T17:01:21Z
dc.date.available2017-07-13T17:01:21Z
dc.date.issued2015-07-10
dc.identifier.citationLine , M R , Teske , J , Burningham , B , Fortney , J & Marley , M 2015 , ' Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs I : Characterizing Benchmarks, Gl570D and HD3651B ' , The Astrophysical Journal , vol. 807 , no. 2 , 183 . https://doi.org/10.1088/0004-637X/807/2/183
dc.identifier.issn0004-637X
dc.identifier.otherPURE: 10391881
dc.identifier.otherPURE UUID: 0b0d7ace-23d4-42ca-99fc-87941468386d
dc.identifier.otherArXiv: http://arxiv.org/abs/1504.06670v2
dc.identifier.otherScopus: 84937019845
dc.identifier.otherORCID: /0000-0003-4600-5627/work/64327323
dc.identifier.urihttp://hdl.handle.net/2299/18924
dc.descriptionMichael Line, et al, 'UNIFORM ATMOSPHERIC RETRIEVAL ANALYSIS OF ULTRACOOL DWARFS. I. CHARACTERIZING BENCHMARKS, Gl 570D AND HD 3651B', The Astrophysical Journal, Vol. 802 (2), July 2015, doi: https://doi.org/10.1088/0004-637X/807/2/183, published by IOP.
dc.description.abstractInterpreting the spectra of brown dwarfs is key to determining the fundamental physical and chemical processes occurring in their atmospheres. Powerful Bayesian atmospheric retrieval tools have recently been applied to both exoplanet and brown dwarf spectra to tease out the thermal structures and molecular abundances to understand those processes. In this manuscript we develop a significantly upgraded retrieval method and apply it to the SpeX spectral library data of two benchmark late T-dwarfs, Gl570D and HD3651B, to establish the validity of our upgraded forward model parameterization and Bayesian estimator. Our retrieved metallicities, gravities, and effective temperature are consistent with the metallicity and presumed ages of the systems. We add the carbon-to-oxygen ratio as a new dimension to benchmark systems and find good agreement between carbon-to-oxygens ratio derived in the brown dwarfs and the host stars. Furthermore, we have for the first time unambiguously determined the presence of ammonia in the low-resolution spectra of these two late T-dwarfs. We also show that the retrieved results are not significantly impacted by the possible presence of clouds, though some quantities are significantly impacted by uncertainties in photometry. This investigation represents a watershed study in establishing the utility of atmospheric retrieval approaches on brown dwarf spectra.en
dc.format.extent20
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.rightsOpen
dc.subjectastro-ph.SR
dc.subjectastro-ph.EP
dc.titleUniform Atmospheric Retrieval Analysis of Ultracool Dwarfs I : Characterizing Benchmarks, Gl570D and HD3651Ben
dc.contributor.institutionCentre for Astrophysics Research
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.description.statusPeer reviewed
dc.description.versiontypeFinal Published version
dcterms.dateAccepted2015-07-10
rioxxterms.versionVoR
rioxxterms.versionofrecordhttps://doi.org/10.1088/0004-637X/807/2/183
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue
herts.rights.accesstypeOpen


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