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arXiv 1206.3307astro-ph.EP
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低质量恒星周围的行星(PALMS)。II。年轻M矮星GJ 3629的一颗小质量伴星

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

Brendan P. Bowler, Michael C. Liu, Evgenya L. Shkolnik, Motohide Tamura

摘要:

我们提出了一个0.2”的年轻的M矮星GJ 3629的同伴的发现,作为我们的高对比度自适应光学成像搜索低质量恒星周围的巨行星的一部分,与Sask-II和斯巴鲁望远镜。两个时期的成像证实了这一对是共同运动的,并揭示了轨道运动的迹象。其主要特征是X射线发射饱和,加上GALEX的紫外光度测定,年龄小于3亿年。在这些年龄,伴星位于氢燃烧极限以下,根据系统的测光距离为22 +/- 3 pc,其模型依赖的质量为46 +/- 16 Mjup。这对天体的分辨YJHK光度表明GJ 3629 B的光谱型为M7 +/- 2。GJ 3629 AB的轨道周期估计为21 +/- 5年,预计距离为4.4 +/- 0.6天文单位,很可能在未来几年内产生动力学质量,使其成为少数几个具有测量质量和年龄的棕矮星之一。

英文摘要:

We present the discovery of a 0.2" companion to the young M dwarf GJ 3629 as part of our high contrast adaptive optics imaging search for giant planets around low-mass stars with the Keck-II and Subaru telescopes. Two epochs of imaging confirm the pair is co-moving and reveal signs of orbital motion. The primary exhibits saturated X-ray emission, which together with its UV photometry from GALEX point to an age younger than ~300 Myr. At these ages the companion lies below the hydrogen burning limit with a model-dependent mass of 46 +/- 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 for GJ 3629 B. With a projected separation of 4.4 +/- 0.6 AU and an estimated orbital period of 21 +/- 5 yr, GJ 3629 AB is likely to yield a dynamical mass in the next several years, making it one of only a handful of brown dwarfs to have a measured mass and an age constrained from the stellar primary.

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