A Giant Planet Candidate near a Young Brown Dwarf

A.-M. Lagrange; B. Zuckerman; C. Dumas; D. Mouillet; G. Chauvin; I. Song; J.-L. Beuzit; P. Lowrance

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A Giant Planet Candidate near a Young Brown Dwarf

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arxiv astro-ph/0409323 v1 pith:6THLY76Z submitted 2004-09-14 astro-ph

A Giant Planet Candidate near a Young Brown Dwarf

G. Chauvin , A.-M. Lagrange , C. Dumas , B. Zuckerman , D. Mouillet , I. Song , J.-L. Beuzit , P. Lowrance This is my paper

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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.

A Giant Planet Candidate near a Young Brown Dwarf

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