The discovery of a T6.5 subdwarf

B. Burningham, Leigh Smith, C. V. Cardoso, P.W. Lucas, A. J. Burgasser, H.R.A. Jones, R.L. Smart

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13 Citations (Scopus)
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Abstract

We report the discovery of ULAS J131610.28+075553.0, an sdT6.5 dwarf in the UKIDSS Large Area Survey 2 epoch proper motion catalogue. This object displays significant spectral peculiarity, with the largest yet seen deviations from T6 and T7 templates in the Y and K bands for this subtype. Its large, similar to 1 arcsec yr(-1), proper motion suggests a large tangential velocity of V-tan approximate to 240-340 km s(-1), if we assume its M-J lies within the typical range for T6.5 dwarfs. This makes it a candidate for membership of the Galactic halo population. However, other metal-poor T dwarfs exhibit significant under luminosity both in specific bands and bolometrically. As a result, it is likely that its velocity is somewhat smaller, and we conclude it is a likely thick disc or halo member. This object represents the only T dwarf earlier than T8 to be classified as a subdwarf, and is a significant addition to the currently small number of known unambiguously substellar subdwarfs.

Original languageEnglish
Pages (from-to)359-364
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume440
Issue number1
DOIs
Publication statusPublished - May 2014

Keywords

  • surveys
  • brown dwarfs
  • stars: low-mass
  • DEEP SKY SURVEY
  • SURVEY-EXPLORER WISE
  • LARGE-AREA SURVEY
  • SUN-LIKE STAR
  • T-DWARFS
  • BROWN DWARFS
  • SPECTRAL CLASSIFICATION
  • ROSS 458C
  • UKIDSS
  • COMPANION

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