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We present the discovery of a 0.2" companion to the young M dwarf GJ 3629 aspart of our high contrast adaptive optics imaging search for giant planetsaround low-mass stars with the Keck-II and Subaru telescopes. Two epochs ofimaging confirm the pair is co-moving and reveal signs of orbital motion. Theprimary exhibits saturated X-ray emission, which together with its UVphotometry from GALEX point to an age younger than ~300 Myr. At these ages thecompanion lies below the hydrogen burning limit with a model-dependent mass of46 +/- 16 Mjup based on the system's photometric distance of 22 +/- 3 pc.Resolved YJHK photometry of the pair indicates a spectral type of M7 +/- 2 forGJ 3629 B. With a projected separation of 4.4 +/- 0.6 AU and an estimatedorbital period of 21 +/- 5 yr, GJ 3629 AB is likely to yield a dynamical massin the next several years, making it one of only a handful of brown dwarfs tohave a measured mass and an age constrained from the stellar primary.

Planets Around Low-Mass Stars (PALMS). II. A Low-Mass Companion to the Young M Dwarf GJ 3629 Separated By 0.2"