Deep z-band observations of the coolest y dwarf

Taisiya G. Kopytova, Ian J M Crossfield, Niall R. Deacon, Wolfgang Brandner, Esther Buenzli, Amelia Bayo, Joshua E. Schlieder, Elena Manjavacas, Beth A. Biller, Derek Kopon

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11 Citations (Scopus)
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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)

Original languageEnglish
Article number3
Number of pages4
JournalThe Astrophysical Journal
Volume797
Issue number1
DOIs
Publication statusPublished - 17 Nov 2014

Keywords

  • brown dwarfs
  • stars: individual (WISE J085510.83-071442.5)
  • stars: low-mass

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