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dc.contributor.authorLeggett, S.
dc.contributor.authorSaumon, D.
dc.contributor.authorMarley, M.
dc.contributor.authorLodders, K.
dc.contributor.authorCanty, J.
dc.contributor.authorLucas, P.W.
dc.contributor.authorSmart, R.
dc.contributor.authorTinney, C.
dc.contributor.authorHomeier, D.
dc.contributor.authorAllard, F.
dc.contributor.authorBurningham, B.
dc.contributor.authorDay-Jones, A.
dc.contributor.authorFegley, B.
dc.contributor.authorIshii, Miki
dc.contributor.authorJones, H.R.A.
dc.contributor.authorMarocco, F.
dc.contributor.authorPinfield, D.J.
dc.contributor.authorTamura, M.
dc.date.accessioned2012-04-03T14:00:29Z
dc.date.available2012-04-03T14:00:29Z
dc.date.issued2012-04-01
dc.identifier.citationLeggett , S , Saumon , D , Marley , M , Lodders , K , Canty , J , Lucas , P W , Smart , R , Tinney , C , Homeier , D , Allard , F , Burningham , B , Day-Jones , A , Fegley , B , Ishii , M , Jones , H R A , Marocco , F , Pinfield , D J & Tamura , M 2012 , ' The Properties of the 500 K Dwarf UGPS J072227.51-054031.2, and a Study of the Far-Red Flux of Cold Brown Dwarfs ' , The Astrophysical Journal , vol. 748 , no. 2 , L74 . https://doi.org/10.1088/0004-637X/748/2/74
dc.identifier.issn0004-637X
dc.identifier.otherArXiv: http://arxiv.org/abs/1201.2973v1
dc.identifier.otherORCID: /0000-0002-8872-4462/work/62748882
dc.identifier.otherORCID: /0000-0003-4600-5627/work/64327331
dc.identifier.urihttp://hdl.handle.net/2299/8169
dc.description46 pages, 5 Tables, 15 Figures; accepted for publication in ApJ, January 13 2012
dc.description.abstractWe present i and z photometry for 25 T dwarfs and one L dwarf. Combined with published photometry, the data show that the i - z, z - Y and z - J colors of T dwarfs are very red, and continue to increase through to the late-type T dwarfs, with a hint of a saturation for the latest types with T_eff ~ 600 K. We present new 0.7-1.0 um and 2.8-4.2 um spectra for the very late-type T dwarf UGPS J072227.51-054031.2, as well as improved astrometry for this dwarf. Examination of the spectral energy distribution using the new and published data, with Saumon & Marley models, shows that the dwarf has T_eff = 505 +/- 10 K, a mass of 3-11 M_Jupiter and an age between 60 Myr and 1 Gyr. This young age is consistent with the thin disk kinematics of the dwarf. The mass range overlaps with that usually considered to be planetary, despite this being an unbound object discovered in the field near the Sun. This apparently young rapid rotator is also undergoing vigorous atmospheric mixing, as determined by the IRAC and WISE-2 4.5 um photometry and the Saumon & Marley models. The optical spectrum for this 500 K object shows clearly detected lines of the neutral alkalis Cs and Rb, which are emitted from deep atmospheric layers with temperatures of 900-1200 K.en
dc.format.extent861310
dc.language.isoeng
dc.relation.ispartofThe Astrophysical Journal
dc.subjectastro-ph.SR
dc.titleThe Properties of the 500 K Dwarf UGPS J072227.51-054031.2, and a Study of the Far-Red Flux of Cold Brown Dwarfsen
dc.contributor.institutionSchool of Physics, Astronomy and Mathematics
dc.contributor.institutionScience & Technology Research Institute
dc.contributor.institutionCentre for Astrophysics Research
dc.description.statusPeer reviewed
rioxxterms.versionofrecord10.1088/0004-637X/748/2/74
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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