Discovery of the benchmark metal poor T8 dwarf BD+01 2920B
D. J. Pinfield, B. Burningham, N. Lodieu, S. K. Leggett, C. G. Tinney,, L. van Spaandonk, F. Marocco, R. Smart, J. Gomes, L. Smith, P. W. Lucas, A., C. Day-Jones, D. N. Murray, A. C. Katsiyannis, S. Catalan, C. Cardoso, J. R., A. Clarke, S. Folkes, M. C. Galvez-Ortiz, D. Homeier
TL;DR
This paper reports the discovery of a metal-poor T8 dwarf companion to a G1 star, providing a benchmark for studying T dwarf properties and their relation to metallicity and age.
Contribution
It presents the discovery of a new benchmark T8p dwarf with well-characterized properties and a detailed analysis of its implications for T dwarf populations.
Findings
The T8p dwarf has a temperature of 680±55K.
The primary star has a metallicity of [Fe/H]=-0.38.
The T dwarf's properties suggest many are young, low-mass objects.
Abstract
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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