arXiv 1009.30132010-09-15astro-ph.EP

疏散星团transit巡天的包围分析：与场一致的短周期行星频率的上限

Ensemble analysis of open cluster transit surveys: upper limits on the frequency of short-period planets consistent with the field

Jennifer L. van Saders, B. Scott Gaudi

备注：: 14 pages, 4 figures
DOI：: 10.1088/0004-637X/729/1/63

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摘要：

几次短周期凌日巨行星的光度测量已经瞄准了一些疏散星团，但没有令人信服的探测结果。虽然每一个单独的调查通常针对数量不足的恒星，预计检测假设短周期的巨行星的调查领域的恒星的频率，我们问是否缺乏检测从合奏的疏散星团调查是不一致的期望从外地行星人口。我们选择了一个子集，现有的过境调查与定义良好的选择标准和量化的检测效率，并统计结合他们的零结果显示，在行星分数的上限为5.5%和1.4%的1.0 $R_{J}$和1.5 $R_{J}$行星，分别在$3<P<5$天的周期范围。对于$1<P<3$天的周期范围，我们发现1.0 $R_{J}$和1.5 $R_{J}$的上限分别为1.4%和0.31%。将这些结果与视向速度和凌日观测中的短周期巨行星围绕场星的频率进行比较，我们得出结论，没有证据表明疏散星团支持与现有数据相比根本不同的行星种群。

英文摘要：

Several photometric surveys for short-period transiting giant planets have targeted a number of open clusters, but no convincing detections have been made. Although each individual survey typically targeted an insufficient number of stars to expect a detection assuming the frequency of short-period giant planets found in surveys of field stars, we ask whether the lack of detections from the ensemble of open cluster surveys is inconsistent with expectations from the field planet population. We select a subset of existing transit surveys with well-defined selection criteria and quantified detection efficiencies, and statistically combine their null results to show that the upper limit on the planet fraction is 5.5% and 1.4% for 1.0 $R_{J}$ and 1.5 $R_{J}$ planets, respectively in the $3<P<5$ day period range. For the period range of $1<P<3$ days we find upper limits of 1.4% and 0.31% for 1.0 $R_{J}$ and 1.5 $R_{J}$, respectively. Comparing these results to the frequency of short-period giant planets around field stars in both radial velocity and transit surveys, we conclude that there is no evidence to suggest that open clusters support a fundamentally different planet population than field stars given the available data.

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