A Giant Planet Candidate near a Young Brown Dwarf
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Astrophysics, abstract
astro-ph/0409323
From: Gael Chauvin [view email]
Date: Tue, 14 Sep 2004 08:17:15 GMT (54kb)
A Giant Planet Candidate near a Young Brown Dwarf
Authors:
G. Chauvin,
A.-M. Lagrange,
C. Dumas,
B. Zuckerman,
D. Mouillet,
I. Song,
J.-L. Beuzit,
P. Lowrance
Comments: 4 pages and 4 figures, letter accepted to A&A
We present deep VLT/NACO infrared imaging and spectroscopic observations of
the brown dwarf 2MASSWJ1207334-393254, obtained during our on-going adaptive
optics survey of southern young, nearby associations. This 25 MJup brown dwarf,
located 70 pc from Earth, has been recently identified as a member of the TW
Hydrae Association (age 8 Myr). Using adaptive optics infrared wavefront
sensing to acquire sharp images of its circumstellar environment, we discovered
a very faint and very red object at a close separation of 780 mas (55 AU).
Photometry in the H, Ks and L’ bands and upper limit in J-band are compatible
with a spectral type L5-L9.5. Near-infrared spectroscopy is consistent with
this spectral type estimate. Different evolutionary models predict an object
within the planetary regime with a mass of 5+-2 MJup and an effective
temperature of Teff=1250+-200K.
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