dc.contributor.author | Kopytova, Taisiya G. | |
dc.contributor.author | Crossfield, Ian J M | |
dc.contributor.author | Deacon, Niall R. | |
dc.contributor.author | Brandner, Wolfgang | |
dc.contributor.author | Buenzli, Esther | |
dc.contributor.author | Bayo, Amelia | |
dc.contributor.author | Schlieder, Joshua E. | |
dc.contributor.author | Manjavacas, Elena | |
dc.contributor.author | Biller, Beth A. | |
dc.contributor.author | Kopon, Derek | |
dc.date.accessioned | 2017-07-19T16:37:10Z | |
dc.date.available | 2017-07-19T16:37:10Z | |
dc.date.issued | 2014-11-17 | |
dc.identifier.citation | Kopytova , T G , Crossfield , I J M , Deacon , N R , Brandner , W , Buenzli , E , Bayo , A , Schlieder , J E , Manjavacas , E , Biller , B A & Kopon , D 2014 , ' Deep z-band observations of the coolest y dwarf ' , The Astrophysical Journal , vol. 797 , no. 1 , 3 . https://doi.org/10.1088/0004-637X/797/1/3 | |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | http://hdl.handle.net/2299/18995 | |
dc.description | Taisiya G. Kopytova, et al., “Deep z-band observations of the coolest y dwarf”, The Astrophysical Journal, Vol. 797(1), November 2014. © 2014. The American Astronomical Society. | |
dc.description.abstract | WISE J085510.83-071442.5 (hereafter, WISE 0855-07) is the coolest Y dwarf known to date and is located at a distance of 2.31 ± 0.08 pc, giving it the fourth largest parallax of any known star or brown dwarf system. We report deep z-band observations of WISE 0855-07 using FORS2 on UT1/Very Large Telescope. We do not detect any counterpart to WISE 0855-07 in our z-band images and estimate a brightness upper limit of AB mag > 24.8 (F ν <0.45 μJy) at 910 ± 65 nm with 3σ confidence. We combine our z-band upper limit with previous near- and mid-infrared photometry to place constraints on the atmospheric properties of WISE 0855-07 via comparison to models which implement water clouds in the atmospheres of T eff <300 K substellar objects. We find that none of the available models that implement water clouds can completely reproduce the observed spectral energy distribution of WISE 0855-07. Every model significantly disagrees with the (3.6 μm/4.5 μm) flux ratio and at least one other bandpass. Since methane is predicted to be the dominant absorber at 3-4 μm, these mismatches might point to an incorrect or incomplete treatment of methane in current models. We conclude that (a) WISE0855-07 has T eff 200-250 K, (b) | en |
dc.format.extent | 4 | |
dc.format.extent | 863983 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | brown dwarfs | |
dc.subject | stars: individual (WISE J085510.83-071442.5) | |
dc.subject | stars: low-mass | |
dc.subject | Nuclear and High Energy Physics | |
dc.title | Deep z-band observations of the coolest y dwarf | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | Science & Technology Research Institute | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=84914671688&partnerID=8YFLogxK | |
rioxxterms.versionofrecord | 10.1088/0004-637X/797/1/3 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |