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

March 2000 • 2000ApJ...531L..57B

Authors • Burgasser, Adam J. • Kirkpatrick, J. Davy • Cutri, Roc M. • McCallon, Howard • Kopan, Gene • Gizis, John E. • Liebert, James • Reid, I. Neill • Brown, Michael E. • Monet, David G. • Dahn, Conard C. • Beichman, Charles A. • Skrutskie, Michael F.

Abstract • 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 (M_J=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_solar and T_eff=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 M_Jup for this object.

Links

• SIMBAD http://simbad.u-strasbg.fr/simbo.pl?bibcode=2000ApJ...531L..57B
• PDF https://iopscience.iop.org/article/10.1086/312522/pdf
• PREPRINT http://arxiv.org/abs/astro-ph/0001194
• ELECTR https://doi.org/10.1086%2F312522
• SPIRES http://inspirehep.net/search?p=find+eprint+astro-ph/0001194