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arXiv 1206.0601astro-ph.EPastro-ph.SR
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开普勒transit候选物VII的SOPHIE速度测量。开普勒近距离巨型系外行星候选者的假阳性率为35%

SOPHIE velocimetry of Kepler transit candidates VII. A false-positive rate of 35% for Kepler close-in giant exoplanet candidates

A. Santerne, R. F. Díaz, C. Moutou, F. Bouchy, G. Hébrard, J. -M. Almenara, A. S. Bonomo, M. Deleuil, N. C. Santos

备注：
Accepted in A&A. 16 pages including 4 online material pages. 6 figures and 1 table
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摘要：

开普勒凌日候选天体的假阳性概率是候选天体性质统计研究的一个重要参数。先前对开普勒视野中恒星星族的调查提供了一个估计，对于大多数候选者，FPP小于5%。我们在这里报告的结果，我们的径向速度观测样本的46开普勒候选人的过境深度大于0.4%，轨道周期小于25天，主恒星亮度比开普勒14.7等。我们使用安装在上普罗旺斯天文台1.93米望远镜上的苏菲摄谱仪来确定凌日候选者的性质。在这个样本中，我们发现了五个未稀释的食双星，两个褐矮星，六个稀释的食双星，和九个新的凌日行星，补充了11个已经公布的行星。其余13名候选人没有随访或由于光子噪声限制或缺乏观察而仍未解决。根据这些结果，我们计算出开普勒近巨星候选者的FPP为34.8% \pm 6.5%。我们的目的是调查的变化的巨大的候选人与较长的轨道周期，发现它应该是恒定的轨道周期之间的10和200天。这与以前的估计不一致。我们讨论了这种差异的原因，以及这项工作可能扩展到较小的行星候选人。最后，考虑到假阳性率，我们从开普勒数据中改进了热木星的出现率。

英文摘要：

The false-positive probability (FPP) of Kepler transiting candidates is a key value for statistical studies of candidate properties. A previous investigation of the stellar population in the Kepler field has provided an estimate for the FPP of less than 5% for most of the candidates. We report here the results of our radial velocity observations on a sample of 46 Kepler candidates with a transit depth greater than 0.4%, orbital period less than 25 days and host star brighter than Kepler magnitude 14.7. We used the SOPHIE spectrograph mounted on the 1.93-m telescope at the Observatoire de Haute-Provence to establish the nature of the transiting candidates. In this sample, we found five undiluted eclipsing binaries, two brown dwarfs, six diluted eclipsing binaries, and nine new transiting planets that complement the 11 already published planets. The remaining 13 candidates were not followed-up or remain unsolved due to photon noise limitation or lack of observations. From these results we computed the FPP for Kepler close-in giant candidates to be 34.8% \pm 6.5%. We aimed to investigate the variation of the FPP for giant candidates with the longer orbital periods and found that it should be constant for orbital periods between 10 and 200 days. This significant disagrees with the previous estimates. We discuss the reasons for this discrepancy and the possible extension of this work toward smaller planet candidates. Finally, taking the false-positive rate into account, we refined the occurrence rate of hot jupiters from the Kepler data.

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