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

A. J. Burgasser·J. D. Kirkpatrick·R. M. Cutri·H. McCallon·G. Kopan·J. E. Gizis·J. Liebert·I. N. Reid·M. E. Brown·D. G. Monet·C. C. Dahn·C. A. Beichman·M. F. Skrutskie
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Abstract

We report the discovery of a widely separated (258$\farcs3\pm0\farcs$4) T dwarf companion to the Gl 570ABC system. This new component, Gl 570D, was initially identified from the Two Micron All Sky Survey (2MASS). Its near-infrared spectrum shows the 1.6 and 2.2 $\micron$ CH$_4$ absorption bands characteristic of T dwarfs, while its common proper motion with the Gl 570ABC system confirms companionship. Gl 570D (M$_J$ = 16.47$\pm$0.07) is nearly a full magnitude dimmer than the only other known T dwarf companion, Gl 229B, and estimates of L = (2.8$\pm$0.3)x10$^{-6}$ L$_{\sun}$ and T$_{eff}$ = 750$\pm$50 K make it significantly cooler and less luminous than any other known brown dwarf companion. Using evolutionary models by Burrows et al. and an adopted age of 2-10 Gyr, we derive a mass estimate of 50$\pm$20 M$_{Jup}$ for this object.

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A. J. Burgasser, J. D. Kirkpatrick, R. M. Cutri, H. McCallon, G. Kopan, J. E. Gizis, J. Liebert, I. N. Reid, M. E. Brown, D. G. Monet, C. C. Dahn, C. A. Beichman, M. F. Skrutskie. 2000-01-11. Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B. https://doi.org/10.1086/312522

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