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

Burgasser, Adam J. and Kirkpatrick, J. Davy and Cutri, Roc M. and McCallon, Howard and Kopan, Gene and Gizis, John E. and Liebert, James and Reid, I. Neill and Brown, Michael E. and Monet, David G. and Dahn, Conard C. and Beichman, Charles A. and Skrutskie, Michael F. (2000) Discovery of a Brown Dwarf Companion to Gliese 570ABC: A 2MASS T Dwarf Significantly Cooler than Gliese 229B. Astrophysical Journal, 531 (1). L57-L60. ISSN 0004-637X. doi:10.1086/312522.

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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 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 ± 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) × 10^(-6) L_☉ 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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Burgasser, Adam J.0000-0002-6523-9536
Kirkpatrick, J. Davy0000-0003-4269-260X
Cutri, Roc M.0000-0002-0077-2305
Gizis, John E.0000-0002-8916-1972
Brown, Michael E.0000-0002-8255-0545
Beichman, Charles A.0000-0002-5627-5471
Additional Information:© 2000 American Astronomical Society. Received 1999 November 22; accepted 2000 January 11; published 2000 February 10. A. J. B. acknowledges Robert Blum and Ron Probst for their guidance at the telescope and in the reduction process, the capable assistance of CTIO telescope operators Mauricio Fernandez and Alberto Zúniga, useful discussions with Mark Marley, helpful comments from the anonymous referee, and Daniel Durand for dealing with high volumes of image requests on the CADC DSS server. We thank the 2MASS staff and scientists for their efforts in creating a truly incredible astronomical resource. DSS images were obtained from the Canadian Astronomy Data Centre, which is operated by the Herzberg Institute of Astrophysics, National Research Council of Canada. A. J. B., J. D. K., I. N. R., and J. L. acknowledge funding through a NASA/JPL grant to 2MASS Core Project science. A. J. B., J. D. K., R. M. C., and C. A. B. acknowledge the support of the Jet Propulsion Laboratory, California Institute of Technology, which is operated under contract with the National Aeronautics and Space Administration. This publication makes use of data from the Two Micron All-Sky Survey, which 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.
Group:Infrared Processing and Analysis Center (IPAC), Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Subject Keywords:binaries: visual; infrared: stars; stars: fundamental parameters; stars: individual (Gliese 570D); stars: low-mass, brown dwarfs
Issue or Number:1
Record Number:CaltechAUTHORS:20120926-154423821
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34481
Deposited By: Ruth Sustaita
Deposited On:27 Sep 2012 15:52
Last Modified:09 Nov 2021 23:08

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