A second substellar companion in the Gliese 86 system. A brown dwarf in an extrasolar planetary system

Details A second substellar companion in the Gliese 86 system. A brown dwarf in an extrasolar planetary system A second substellar companion in the Gliese 86 system. A brown dwarf in an extrasolar planetary system

Apr 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...370l...1e&link_type=abstract

Astronomy and Astrophysics, v.370, p.L1-L4 (2001)

Astronomy and Astrophysics

Astrophysics

64

Stars: Individual: Gliese 86, Stars: Brown Dwarfs, Planetary Systems

Scientific paper

We report observations using the ESO adaptive optics system ADONIS of the known extrasolar planetary system Gliese 86. This star has a known 4 MJup sin i planet in a 15.8 day orbit and exhibits an additional, large, long-period, radial velocity drift (\cite{queloz00}). The coronographic images reveal a faint (J=14.7, H=14.4, K=13.7) object at a projected distance of r=1{.'' 72 +/- 0.'' 02 and PA=119+/- 1 o. 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{leggett00}. 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 MGJ86B <= 70 MJup can be inferred from the models by \cite{baraffe98}. Dusty model atmospheres appear not to be compatible with the IR colors. Based on observations collected with the 3.6~m Telescope of the European Southern Observatory La Silla under proposal Nos. 66.C-0333, 266.C-5621 and 266.C-5634.

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