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十个新的和更新的多行星系统，以及系外行星系统的调查

Ten New and Updated Multi-planet Systems, and a Survey of Exoplanetary Systems

J. T. Wright, S. Upadhyay, G. W. Marcy, D. A. Fischer, Eric B. Ford, John Asher Johnson

备注：
ApJ accepted. v.2 makes minor corrections to author list, citations, and provides a stable set of orbital parameters for HD 183263 in Table 1. v.3 makes preprint consistent with ApJ version, minor changes to wording, orbital parameters of HD 217107 and HD 187123c in Table 1
发表信息：
Astrophys.J.693:1084-1099,2009
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摘要：

我们提出了10个多行星系统的最新速度，包括对Keck和Lick档案数据的重新分析，从而改进了速度，取代了我们以前发表的测量结果。我们得到更新的轨道适合10利克和凯克系统，包括两个系统（HD 11964，HD 183263），我们提供了第二颗行星的确认，只有在其他地方暂时确定，和其他两个（HD 187123，和HD 217107），我们提供了一个主要的修订外行星的轨道。我们从文献中编译轨道要素，以生成200 pc以内的28个已发表的多行星系统的目录。从这个目录中，我们发现了几个有趣的模式：-包括那些具有长期径向速度趋势的系统，至少28%的已知行星系统似乎包含多个行星。- 多行星系统中的行星比单行星的偏心率小一些。- 多行星系统和单行星系统中行星轨道距离的分布不一致：单行星系统在P ~ 3天处出现堆积，在1 AU附近出现跳跃，而多行星系统在对数周期内表现出更均匀的分布。此外，在所有的行星系统中，我们发现：-恒星质量和巨行星半长轴之间可能存在一种新兴的正相关关系。- 质量比木星大的系外行星的偏心率分布范围广泛，在0 < e < 0.5，而质量较低的系外行星的偏心率分布在e = 0附近达到峰值。

英文摘要：

We present the latest velocities for 10 multi-planet systems, including a re-analysis of archival Keck and Lick data, resulting in improved velocities that supersede our previously published measurements. We derive updated orbital fits for ten Lick and Keck systems, including two systems (HD 11964, HD 183263) for which we provide confirmation of second planets only tentatively identified elsewhere, and two others (HD 187123, and HD 217107) for which we provide a major revision of the outer planet's orbit. We compile orbital elements from the literature to generate a catalog of the 28 published multiple-planet systems around stars within 200 pc. From this catalog we find several intriguing patterns emerging: - Including those systems with long-term radial velocity trends, at least 28% of known planetary systems appear to contain multiple planets. - Planets in multiple-planet systems have somewhat smaller eccentricities than single planets. - The distribution of orbital distances of planets in multi-planet systems and single planets are inconsistent: single-planet systems show a pile-up at P ~ 3 days and a jump near 1 AU, while multi-planet systems show a more uniform distribution in log-period. In addition, among all planetary systems we find: - There may be an emerging, positive correlation between stellar mass and giant-planet semi-major axis. - Exoplanets more massive than Jupiter have eccentricities broadly distributed across 0 < e < 0.5, while lower-mass exoplanets exhibit a distribution peaked near e = 0.

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