Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B

Details Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B

May 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...19510913b&link_type=abstract

American Astronomical Society, 195th AAS Meeting, #109.13; Bulletin of the American Astronomical Society, Vol. 32, p.876

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Scientific paper

We report the discovery of a widely separated (258.3s+/-0.4s) T dwarf companion to the Gl 570ABC system. This new component, Gl 570D, was initially identified by the Two Micron All Sky Survey (2MASS). Its near-infrared spectrum shows the 1.6 and 2.2 μm CH4 absorption bands characteristic of T dwarfs, while its common proper motion with the Gl 570ABC system, confirmed by 2MASS, establishes companionship. Gl 570D (MJ = 16.47+/-0.07) is nearly a full magnitude dimmer than the only other known T dwarf companion, Gl 229B, and estimates of L = (2.8+/-0.3)x10-6 L&sun; and Teff = 790+/-40 K make it significantly less luminous and cooler than any other known brown dwarf. Using evolutionary models by Burrows et al. and an adopted age of 2-10 Gyr, we derive a mass estimate of 50+/-20 MJup for this object. The Two Micron All Sky Survey is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration and the National Science Foundation.

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