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arXiv 2402.07903astro-ph.EPastro-ph.IMastro-ph.SR
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星历匹配揭示K2任务中经验证和候选行星的假阳性

Ephemeris Matching Reveals False Positive Validated and Candidate Planets from the K2 Mission

Drake A. Lehmann, Andrew Vanderburg

AI总结:

本文利用星历匹配技术识别K2行星候选样本中的假阳性,发现43个假阳性(含一颗曾被验证的行星K2-256 b),从而提升K2行星样本的可靠性。

摘要:

开普勒太空望远镜的数据已促成数千颗行星候选体的发现。这些候选体大多可能是真实的系外行星,但仍有相当数量的假阳性污染样本,尤其是在K2任务提供的候选列表中。识别并剔除行星候选样本中潜藏的假阳性,对于优先分配后续观测资源和获取最准确的行星族群统计至关重要。在此,我们使用一种称为“星历匹配”的技术来识别K2行星候选样本中的假阳性,该技术通过比较不同信号的周期和凌星时间来实现。当来自不同恒星的信号呈现相同的周期和凌星时间时,我们可以断定至少其中一个信号是污染。我们在已发表的K2行星候选体中识别出43个假阳性(约占完整列表的2%),其中一个(K2-256 b)此前曾被验证为真实系外行星。这项工作提高了K2行星样本的可靠性,并有助于增强对幸存行星候选体的信心。

英文摘要:

Data from the Kepler space telescope have led to the discovery of thousands of planet candidates. Most of these candidates are likely to be real exoplanets, but a significant number of false positives still contaminate the sample, especially in candidate lists from the K2 mission. Identifying and rejecting the false positives lurking in the planet candidates sample is important for prioritizing follow-up resources and measuring the most accurate population statistics. Here, we identify false positives in the K2 planet candidate sample using a technique called "ephemeris matching," in which we compare the period and transit time of different signals. When signals from different stars show the same period and time of transit, we can conclude that at least one of the two signals is contamination. We identify 43 false positives among published K2 planet candidates (nearly 2% of the complete list), one of which (K2-256 b) was previously validated as genuine exoplanet. This work increases the reliability of the K2 planet sample and helps boost confidence in the surviving planet candidates.

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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