SIMBAD references

2000ApJ...531L..57B - Astrophys. J., 531, L57-L60 (2000/March-1)

Discovery of a brown dwarf companion to Gliese 570ABC: a 2MASS T dwarf significantly cooler than Gliese 229B.

BURGASSER A.J., KIRKPATRICK J.D., CUTRI R.M., McCALLON H., KOPAN G., GIZIS J.E., LIEBERT J., REID I.N., BROWN M.E., MONET D.G., DAHN C.C., BEICHMAN C.A. and SKRUTSKIE M.F.

Abstract (from CDS):

We report the discovery of a widely separated (258".3±0".4) T dwarf companion to the Gl 570ABC system. This new component, Gl 570D, was initially identified from the Two Micron All-Sky Survey. 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 confirms 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☉ and Teff=750±50 K make it significantly cooler and less luminous than any other known brown dwarf companion. 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.

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Journal keyword(s): Stars: Binaries: Visual - Infrared: Stars - Stars: Fundamental Parameters - Stars: Individual: Name: Gliese 570D - Stars: Low-Mass, Brown Dwarfs

Simbad objects: 7

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