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

show 15 more authors

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 J. S. Jenkins H. R. A. Jones Z. H. Zhang

Authors on Pith no claims yet

classification 🌌 astro-ph.SR

keywords dwarfbenchmarkknownmetalpoorpropertieswellwisep

0 comments

read the original 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.

This paper has not been read by Pith yet.

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

discussion (0)