A Stellar Companion in the HD 189733 System with a Known Transiting Extrasolar Planet
A Stellar Companion in the HD 189733 System with a Known Transiting Extrasolar Planet
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HD 189733 系统中的恒星伴星与已知的凌日系外行星
DOI：
10.1086/503671
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
R. Stefanik
中科院分区：
文献类型：
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作者：
G. Bakos;A. Pál;D. Latham;R. Noyes;R. Stefanik
我们发现，距离我们很近的(19pc)K0恒星HD 189733是一颗凌日巨行星的轨道，它是一个双星系统的主星，次星是一颗中M矮星，预计与主星的距离约为216AU。这一结论是基于天体测量、自行和径向速度测量、光谱类型确定和光度学。我们还检测到次要物体的微分自行运动。这些数据似乎与第二颗行星的顺时针轨道一致，几乎位于天空平面内(即几乎垂直于凌日行星的轨道平面)，周期约为3200年。
We show that the very close-by (19 pc) K0 star HD 189733, already found to be orbited by a transiting giant planet, is the primary of a double star system, with the secondary being a mid-M dwarf with projected separation of about 216 AU from the primary. This conclusion is based on astrometry, proper-motion and radial velocity measurements, spectral type determination, and photometry. We also detect differential proper motion of the secondary. The data appear consistent with the secondary's orbiting the primary in a clockwise orbit, lying nearly in the plane of the sky (i.e., nearly perpendicular to the orbital plane of the transiting planet), and with period of about 3200 years.