Issue |
A&A
Volume 370, Number 1, April IV 2001
|
|
---|---|---|
Page(s) | L1 - L4 | |
Section | Letters | |
DOI | https://doi.org/10.1051/0004-6361:20010298 | |
Published online | 15 April 2001 |
A second substellar companion in the Gliese 86 system*
A brown dwarf in an extrasolar planetary system
1
Thüringer Landessternwarte Tautenburg, Sternwarte 5, 07778 Tautenburg, Germany
2
Universität Heidelberg, Institut für Theoretische Astrophysik, Tiergartenstr. 15, 69121 Heidelberg, Germany
3
European Southern Observatory, Casilla 19001, Santiago 19, Chile
4
University of California Berkeley/Center for Adaptive Optics, 601 Campbell Hall, Berkeley, CA 94720, USA
5
DSM/DANIA/Service d'Astrophysique, CEA/Saclay, 91191 Gif-sur-Yvette, France
6
Institut für Astronomie, Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
Corresponding author: S. G. Els, sels@kso.tls-tautenburg.de
Received:
1
February
2001
Accepted:
22
February
2001
We report observations using the ESO adaptive optics system
ADONIS of the known extrasolar planetary system Gliese 86.
This star has a known planet in a 15.8 day orbit
and exhibits an additional, large, long-period, radial
velocity drift ([CITE]).
The coronographic images reveal a faint (
)
object at a projected distance of
and
.
Gliese 86 and the discovered object share the same proper motion,
as confirmed by independent measurements at three different epochs
indicating that this system is gravitationally bound.
From the infrared colors and magnitudes we infer an approximate spectral
type for Gliese 86B at the transition from L to T dwarfs, also called
"early T dwarf"assuming the classification by [CITE].
Although present brown dwarf evolutionary models do not cover the
mass and age range probed by this objects, an upper limit of the
mass of about
can be inferred from the models
by [CITE]. Dusty model atmospheres appear not to be compatible
with the IR colors.
Key words: stars: individual: Gliese 86 / stars: brown dwarfs / planetary systems
© ESO, 2001
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