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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; Gálvez-Ortiz, M. C; Homeier, D; Jenkins, J. S; Jones, H. R. A; Zhang, Z. H
Monthly Notices of the Royal Astronomical Society, 20/May , Volume: 422, Issue: 3Journal Article
We have searched the Wide-field Infrared Survey Explorer first data release for widely separated (≤10 000 au) 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 17.2 pc. This new benchmark has T eff= 680 ± 55 K and a mass of 20-50M Jup. 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.
