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        Discovery of the benchmark metal poor T8 dwarf BD+01 2920B

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        904685.pdf (PDF, 932Kb)
        Author
        Pinfield, D.J.
        Burningham, B.
        Lodieu, N.
        Leggett, S.
        Tinney, C.G.
        van Spaandonk, L.
        Marocco, F.
        Smart, R.
        Gomes, J.
        Smith, Leigh
        Lucas, P.W.
        Day-jones, A.
        Murray, D.
        Katsiyannis, A. C.
        Catalan, S.
        Cardoso, C.
        Clarke, James
        Folkes, S.
        Galvez-Ortiz, M.
        Homeier, D.
        Jenkins, J.
        Jones, H.R.A.
        Zhang, Z.
        Attention
        2299/10470
        Abstract
        We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (<=10,000AU) late T dwarf companions to Hipparcos and Gliese stars. We have discovered a new binary system containing a K-band suppressed T8p dwarf WISEP J142320.86+011638.1 and the mildly metal poor ([Fe/H]=-0.38+-0.06) primary BD+01 2920 (HIP 70319), a G1 dwarf at a distance of 17.2pc. This new benchmark has Teff=680+-55K and a mass of 20-50MJup. Its spectral properties are well modelled except for known discrepancies in the Y and K bands. Based on the well determined metallicity of its companion, the properties of BD+01 2920B imply that the currently known T dwarfs are dominated by young low-mass objects. We also present an accurate proper motion for the T8.5 dwarf WISEP J07003.84+272544.8
        Publication date
        2012
        Published in
        Monthly Notices of the Royal Astronomical Society
        Published version
        https://doi.org/10.1111/j.1365-2966.2012.20549.x
        Other links
        http://hdl.handle.net/2299/10470
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