A Giant Planet Candidate near a Young Brown Dwarf

2004/09/14 by G. Chauvin, A. -M. Lagrange, A.‐M. Lagrange +10 · 63 citations
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph

paper · pdf · doi:10.1051/0004-6361:200400056

published as Astron.Astrophys.425:L29-L32,2004 · 4 pages and 4 figures, letter accepted to A&A

arxiv created 2004/09/14 · openalex publication_date 2004/09/21 · arxiv updated 2010/04/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31

Abstract

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.

Citations

• New Members of the TW Hydrae Association, β Pictoris Moving Group, and Tucana/Horologium Association

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