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

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. and Zhang, Z. (2012) Discovery of the benchmark metal poor T8 dwarf BD+01 2920B. Monthly Notices of the Royal Astronomical Society (MNRAS), 422 (3). pp. 1922-1932. ISSN 0035-8711
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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
Item Type Article
Keywords astro-ph.sr
Date Deposited 15 May 2025 12:24
Last Modified 30 May 2025 23:50

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