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Searching for Planets of Brown Dwarfs1

Published online by Cambridge University Press:  26 May 2016

Eike Guenther  and
Guenther Wuchterl
Eike Guenther
Affiliation:
Thüringer Landessternwarte Tautenburg, 07778 Tautenburg, Germany
Guenther Wuchterl
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik (MPE), Giessenbachstr. 1, 85741 Garching, Germany

Abstract

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Up to now, most planet search projects have concentrated on G and K stars. In order to considerably widen the view, we have stated a survey for planets of old, nearby brown dwarfs and very low-mass stars. Using UVES, we have observed 26 brown dwarfs and very low-mass stars. As it turned out these objects are very inactive and thus highly suitable for such a project. For 19 objects, we can exclude a planet with the mass of 3 MJ, and a period of 100 days or less with a probability of more than 60%. For these objects, we can also exclude Pegasi-planets with a high probability. For another 4 objects, we can exclude at least a brown dwarf companion. One object is a double line spectroscopic binary, and one object shows significant radial-velocity variations that can not be caused by a normal stellar-spot. This object either has a planetary-mass companion, or the variations are caused by surface structures that are quite different from normal star-spots.

Type
Part 6. Searches for Substellar Companions
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 225 - 232
Copyright
Copyright © Astronomical Society of the Pacific 2001 

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