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arXiv 1606.01264astro-ph.EP
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来自K2活动5和6的凌日系外行星候选者

Transiting exoplanet candidates from K2 Campaigns 5 and 6

Benjamin J. S. Pope, Hannu Parviainen, Suzanne Aigrain

摘要:

我们为K2任务的观测引入了一个新的过境搜索和审查管道,并提出了由该管道从活动5和6的目标中确定的候选过境行星。我们的流水线使用基于高斯过程的K2 SC代码来校正K2指向系统,同时对恒星变化进行建模。的系统校正,变异性去趋势的光变曲线进行搜索与框最小二乘法的过境,和一个依赖于周期的检测阈值被用来生成一个初步的候选列表。两个或三个人手动审查每个候选人,以产生最终的候选人名单,使用一组自动生成的过渡适合和分类的诊断测试,以通知审查。我们发现了147个单行星系统候选者和5个多行星系统,独立地恢复了先前公布的热~双星EPIC 212110888 b,WASP-55 b(EPIC 212300977 b)和卡塔尔-2b(EPIC 212756297 b)。我们还报告了对开普勒星等Kp < 13的所有候选者进行的侦察光谱学的结果,确定了12个可能的误报目标。我们将我们的结果与其他K2过境搜索管道的结果进行了比较,注意到我们的结果对于可变和/或活跃的恒星表现得特别好,但结果总体上非常相似。在过境搜索和审查过程中使用的所有光变曲线和代码以及后续光谱都是公开的。

英文摘要:

We introduce a new transit search and vetting pipeline for observations from the K2 mission, and present the candidate transiting planets identified by this pipeline out of the targets in Campaigns 5 and 6. Our pipeline uses the Gaussian Process-based K2SC code to correct for the K2 pointing systematics and simultaneously model stellar variability. The systematics-corrected, variability-detrended light curves are searched for transits with the Box Least Squares method, and a period-dependent detection threshold is used to generate a preliminary candidate list. Two or three individuals vet each candidate manually to produce the final candidate list, using a set of automatically-generated transit fits and assorted diagnostic tests to inform the vetting. We detect 147 single-planet system candidates and 5 multi-planet systems, independently recovering the previously-published hot~Jupiters EPIC 212110888b, WASP-55b (EPIC 212300977b) and Qatar-2b (EPIC 212756297b). We also report the outcome of reconnaissance spectroscopy carried out for all candidates with Kepler magnitude Kp < 13, identifying 12 targets as likely false positives. We compare our results to those of other K2 transit search pipelines, noting that ours performs particularly well for variable and/or active stars, but that the results are very similar overall. All the light curves and code used in the transit search and vetting process are publicly available, as are the follow-up spectra.

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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