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2004•Astronomy and AstrophysicsOpen access

A giant planet candidate near a young brown dwarf

G. Chauvin, A.‐M. Lagrange, Christophe Dumas, B. Zuckerman, D. Mouillet, Inseok Song, J. L. Beuzit, Patrick Lowrance

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Abstract

We present deep VLT/NACO infrared imaging and spectroscopic observations of the brown dwarf 2MASSWJ 1207334-393254, obtained during our on-going adaptive optics survey of southern young, nearby associations. This ~25 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, and 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 and an effective temperature of K.

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We present deep VLT/NACO infrared imaging and spectroscopic observations of the brown dwarf 2MASSWJ 1207334-393254, obtained during our on-going adaptive optics survey of southern young, nearby associations. This ~25 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, and 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 and an effective temperature of K.

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Available abstract

We present deep VLT/NACO infrared imaging and spectroscopic observations of the brown dwarf 2MASSWJ 1207334-393254, obtained during our on-going adaptive optics survey of southern young, nearby associations. This ~25 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, and 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 and an effective temperature of K.

Key concepts: Brown dwarf, Dwarf planet, Photometry (optics), Physics, Planet, Astrophysics, Adaptive optics, Giant planet

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