The Brown Dwarf Kinematics Project: Parallaxes for Southern Low Luminosity Brown Dwarfs

Details The Brown Dwarf Kinematics Project: Parallaxes for Southern Low Luminosity Brown Dwarfs The Brown Dwarf Kinematics Project: Parallaxes for Southern Low Luminosity Brown Dwarfs

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..260f&link_type=abstract

NOAO Proposal ID #2010A-0260

Astronomy and Astrophysics

Astronomy

Scientific paper

The distances and kinematics of brown dwarfs provide key statistical constraints on their ages, moving group membership, absolute brightnesses, evolutionary trends, and multiplicity. Yet fundamental measurements of parallax, proper motion and radial velocity have been made for only a relatively small fraction of the known brown dwarf population. To address this deficiency, we have initiated the Brown Dwarf Kinematics Project which aims to measure and compile the 6D positions and velocities of all known brown dwarfs within 20 pc of the Sun and select sources of scientific interest. As part of this overarching project, we propose a one semester continuation of our approved long-term astrometric program using CTIO 4m + ISPI to measure the distances and proper motions of 51 low luminosity brown dwarfs in the Southern hemisphere. By focusing on the latest-type brown dwarfs, in particular sources spanning the poorly-understood L dwarf/T dwarf transition, this program will provide fundamental measurements for testing atmospheric and evolutionary models, and will allow us to better define the luminosity/effective temperature scale for the lowest luminosity brown dwarfs now known.

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