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arXiv 1607.08237astro-ph.EPastro-ph.IM
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长周期凌日系外行星的数量

The population of long-period transiting exoplanets

Daniel Foreman-Mackey, Timothy D. Morton, David W. Hogg, Eric Agol, Bernhard Schölkopf

摘要:

开普勒任务已经发现了数千颗系外行星,并彻底改变了我们对其人口的理解。这一庞大的、同质的发现目录使得人们能够严格研究系外行星和行星系的出现率与它们的物理特性之间的关系。然而,像开普勒这样的凌日调查对轨道周期比我们太阳系中质量最大的行星木星和土星的轨道周期短得多的行星最敏感。为了解决这一缺陷,我们对长周期系外行星进行了全自动搜索,这些系外行星在开普勒光变曲线档案中只有一到两次凌日。当应用于$\sim 40,000$最明亮的类太阳目标恒星时,这种搜索产生了16个长周期系外行星候选者。在这些候选者中,6个是新发现,5个是在具有内部短周期凌日行星的系统中。由于我们的方法不涉及人为干预,我们凭经验描述了我们搜索的检测效率。基于这些结果,我们测量了轨道周期在2-25年范围内的比木星小的系外行星的平均出现率,即每个类太阳恒星有$2.0\pm0.7$行星。

英文摘要:

The Kepler Mission has discovered thousands of exoplanets and revolutionized our understanding of their population. This large, homogeneous catalog of discoveries has enabled rigorous studies of the occurrence rate of exoplanets and planetary systems as a function of their physical properties. However, transit surveys like Kepler are most sensitive to planets with orbital periods much shorter than the orbital periods of Jupiter and Saturn, the most massive planets in our Solar System. To address this deficiency, we perform a fully automated search for long-period exoplanets with only one or two transits in the archival Kepler light curves. When applied to the $\sim 40,000$ brightest Sun-like target stars, this search produces 16 long-period exoplanet candidates. Of these candidates, 6 are novel discoveries and 5 are in systems with inner short-period transiting planets. Since our method involves no human intervention, we empirically characterize the detection efficiency of our search. Based on these results, we measure the average occurrence rate of exoplanets smaller than Jupiter with orbital periods in the range 2-25 years to be $2.0\pm0.7$ planets per Sun-like star.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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