Dynamical Mass of Gj 802b: a Brown Dwarf in a Triple System
نویسندگان
چکیده
We report a dynamical measurement of the mass of the brown dwarf GJ 802B using aperture-masking interferometry and astrometry. In addition, we report the discovery that GJ 802A is itself a close spectroscopic noneclipsing binary with a 19 hr period.We find the mass of GJ 802B to be 0:063 0:005M . GJ 802 has kinematics inconsistent with a young star and more consistent with the thick-disk population, implying a system age of 10 Gyr. However, model evolutionary tracks for GJ 802B predict system ages of 2 Gyr, suggesting that brown dwarf evolutionary models may be underestimating luminosity for old brown dwarfs. Subject headingg s: stars: low-mass, brown dwarfs Online material: color figure
منابع مشابه
Direct Detection of the Brown Dwarf Gj 802b with Adaptive Optics Masking Interferometry
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تاریخ انتشار 2008