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

D.J. Pinfield, B. Burningham, N. Lodieu, S. Leggett, C.G. Tinney, L. van Spaandonk, F. Marocco, R. Smart, J. Gomes, Leigh Smith, P.W. Lucas, A. Day-jones, D. Murray, A. C. Katsiyannis, S. Catalan, C. Cardoso, James Clarke, S. Folkes, M. Galvez-Ortiz, D. HomeierJ. Jenkins, H.R.A. Jones, Z. Zhang

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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
Original languageEnglish
Pages (from-to)1922-1932
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date13 Apr 2012
Publication statusPublished - 2012


  • astro-ph.SR


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