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Title:
A giant planet candidate near a young brown dwarf. Direct VLT/NACO observations using IR wavefront sensing
Authors:
Chauvin, G.; Lagrange, A.-M.; Dumas, C.; Zuckerman, B.; Mouillet, D.; Song, I.; Beuzit, J.-L.; Lowrance, P.
Affiliation:
AA(European Southern Observatory, Casilla 19001, Santiago 19, Chile ), AB(Laboratoire d'Astrophysique, Observatoire de Grenoble, 414 rue de la piscine, Saint-Martin d'Hères, France), AC(European Southern Observatory, Casilla 19001, Santiago 19, Chile), AD(Department of Physics and Astronomy and Center for Astrobiology, University of California, Los Angeles, 8371 Math Science Building, Box 951562, CA 90095-1562, USA), AE(Laboratoire d'Astrophysique, Observatoire Midi-Pyrénées, Tarbes, France), AF(Department of Physics and Astronomy and Center for Astrobiology, University of California, Los Angeles, 8371 Math Science Building, Box 951562, CA 90095-1562, USA), AG(Laboratoire d'Astrophysique, Observatoire de Grenoble, 414 rue de la piscine, Saint-Martin d'Hères, France), AH(Spitzer Science Center, Infrared Processing and Analysis Center, MS 220-6, Pasadena, CA 91125, USA)
Publication:
Astronomy and Astrophysics, v.425, p.L29-L32 (2004) (A&A; Homepage)
Publication Date:
10/2004
Origin:
A&A
Astronomy Keywords:
2MASSWJ 1207334-393254, brown dwarf, giant planet, adaptive optics imaging and spectroscopy
DOI:
10.1051/0004-6361:200400056
Bibliographic Code:
2004A&A...425L..29C

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 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 M=5±2 MJup and an effective temperature of Teff=1250±200 K.

Based on observations obtained at the Paranal Observatory, Chile, in ESO programs 73.C-0469 and 273.C-5029.

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