37 New T-type Brown Dwarfs in the Canada-France Brown Dwarfs Survey

Details 37 New T-type Brown Dwarfs in the Canada-France Brown Dwarfs Survey 37 New T-type Brown Dwarfs in the Canada-France Brown Dwarfs Survey

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aj....141..203a&link_type=abstract

The Astronomical Journal, Volume 141, Issue 6, article id. 203 (2011).

Astronomy and Astrophysics

Astronomy

7

Brown Dwarfs, Infrared: Stars, Proper Motions, Surveys

Scientific paper

The Canada-France Brown Dwarfs Survey is an i'- and z'-band survey realized with MegaCam at the Canada-France-Hawaii Telescope that covers a surface area of 780 deg2. Image analysis is now completed while J-band follow-up campaigns are ~90% done. The survey identified about 70 T dwarf candidates, of which 43 now have near-infrared spectra obtained with NIRI and GNIRS at Gemini and ISAAC at the Very Large Telescope. Six of these were previously published and we present here the 37 new discoveries, all T dwarfs. They range from T0 to T8.5 with four being of type T7 or later. Both newly identified T8 dwarfs are possibly high log (g) massive brown dwarfs of thin disk age. One T4.5 dwarf shows signs of sub-metallicity. We present proper motions and near-infrared photometry, and discuss about the most peculiar/interesting objects in some details.

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