Keck Laser Guide Star Adaptive Optics Monitoring of 2MASS J1534-2952AB: First Dynamical Mass Determination for a Binary T Dwarf

Details Keck Laser Guide Star Adaptive Optics Monitoring of 2MASS J1534-2952AB: First Dynamical Mass Determination for a Binary T Dwarf Keck Laser Guide Star Adaptive Optics Monitoring of 2MASS J1534-2952AB: First Dynamical Mass Determination for a Binary T Dwarf

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1105l&link_type=abstract

American Astronomical Society, AAS Meeting #212, #11.05; Bulletin of the American Astronomical Society, Vol. 40, p.204

Physics

Optics

Scientific paper

The coolest known brown dwarfs, the T dwarfs, are the lowest luminosity and coolest objects directly imaged outside of our solar system, and thus determining their fundamental properties is a key step towards understanding evolution of substellar objects. We present multi-epoch near-infrared high angular resolution imaging of the binary T dwarf 2MASS J15344984-2952274AB obtained with the Keck laser guide star adaptive optics system from 2005--2008. Discovered by HST in 2000, this object is among the most promising known binary T dwarf for orbital monitoring, given its short estimated eriod, nearly equal-magnitude flux ratio, and high quality parallax measurement. Our excellent Keck data readily detect the orbital motion of the two components, with sub-milliarcsecond relative astrometry. Combined with an extensive (re-)analysis of archival HST imaging, we determine an orbital period of 20 yr, a semi-major axis of 2.9 AU, and a total mass of 62 +/- 5 MJup. This is the coolest and lowest mass binary with a dynamical mass determination to date.

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