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A&A 459, 955-963 (2006)
DOI: 10.1051/0004-6361:20054710
New constrains on Gliese 86 B
VLT near infrared coronographic imaging survey of planetary hosts
A.-M. Lagrange1, H. Beust1, S. Udry2, G. Chauvin3, and M. Mayor21 Laboratoire d'Astrophysique de Grenoble, Université J. Fourier, BP 53, 38041 Grenoble Cedex 9, France
e-mail: lagrange@obs.ujf-grenoble.fr
2 Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
3 ESO Casilla 19001, Santiago 19, Chile
(Received 16 December 2005 / Accepted 1 March 2006)
Abstract
Aims.We present the results of multi epoch imaging observations
of the companion to the planetary host Gliese 86. Associated with
radial velocity measurements, this study aimed at dynamically
characterizing with the orbital properties and the mass of this
companion (hereafter Gliese 86 B), but also at investigating the
possible history of this particular system.
Methods.We used the adaptive optics instrument NACO at the ESO Very Large
Telescope to obtain deep coronographic imaging to obtain new
photometric and astrometric measurements of Gliese 86 B.
Results.Part of the orbit is resolved. The photometry of
Gl 86
B
indicates colors compatible with a ~70 Jupiter mass brown dwarf or a
white dwarf. Both types of objects fit the available, still
limited astrometric data. If we attribute the long term
radial velocity residual drift observed for
Gl 86
A to B,
then the mass of the latter
object is
. We analyse both astrometric and
radial velocity data to propose first orbital parameters for
Gl 86
B.
Assuming
Gl 86
B is a
white dwarf, we explore
the constraints induced by this hypothesis and refine the parameters
of the system.
Key words: stars: individual: Gliese 86 -- stars: low mass, brown dwarfs -- stars: planetary systems -- instrumentation: adaptive optics
© ESO 2006