Discovery of the benchmark metal poor T8 dwarf BD+01 2920B
Pinfield, D. J. · Burningham, B. · Lodieu, N. · Leggett, S. K. · Tinney, C. G. · van Spaandonk, L. · Marocco, F. · Smart, R. · Gomes, J. · Smith, L. · Lucas, P. W. · Day-Jones, A. C. · Murray, D. N. · Katsiyannis, A. C. · Catalan, S. · Cardoso, C. · Clarke, J. R. A. · Folkes, S. · Galvez-Ortiz, M. C. · Homeier, D. · Jenkins, J. S. · Jones, H. R. A. · Zhang, Z. H.
Original · EN
We have searched the WISE 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 J1423+0116 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 20-50 Mjup. 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 J075003.84+272544.8.
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