275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0–10
275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0–10
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K2 活动 0-10 中的 275 颗候选行星和 149 颗已验证行星绕明亮恒星运行
DOI：
10.3847/1538-3881/aaadff
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
J. Winters
中科院分区：
文献类型：
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作者：
A. Mayo;A. Vanderburg;D. Latham;A. Bieryla;T. Morton;L. Buchhave;C. Dressing;C. Beichman;P. Berlind;M. Calkins;D. Ciardi;I. Crossfield;G. Esquerdo;M. Everett;E. Gonzales;L. Hirsch;E. Horch;A. Howard;S. Howell;J. Livingston;Rahul I. Patel;E. Petigura;J. Schlieder;N. Scott;Clea F. Schumer;E. Sinukoff;J. Teske;J. Winters
自2014年以来，美国宇航局的K2任务观测了黄道面的大部分地区，以寻找凌日行星，并发现了数百颗候选行星。随着观测计划至少持续到2018年初，K2将继续发现更多的候选行星。我们在这里展示了K2任务0-10运动期间观测到的275颗候选行星，它们围绕着比13等（开普勒波段）亮的恒星运行，并且我们获得了高分辨率光谱（R = 44,000）。利用vespa软件包对这些候选对象进行分析，以计算它们的假阳性概率（FPP）。我们发现有149个候选物被验证的FPP低于0.1%，其中39个以前只是候选物，56个以前未被检测到。描述了数据简化、候选行星识别和统计验证的过程，并探索了候选行星和新验证行星的人口统计学特征。我们在我们的候选样本的行星半径分布中显示了一个缺口的初步证据。将我们的样本与Fulton等人研究的开普勒候选样本进行比较，我们得出结论，需要更多的行星来定量确认与K2候选行星或已验证行星的差距。这项工作，除了将已验证的K2行星的数量增加近50%，并为后续观测提供新的目标外，还将作为验证即将到来的K2运动和凌日系外行星测量卫星（预计于2018年发射）候选者的框架。
Since 2014, NASA’s K2 mission has observed large portions of the ecliptic plane in search of transiting planets and has detected hundreds of planet candidates. With observations planned until at least early 2018, K2 will continue to identify more planet candidates. We present here 275 planet candidates observed during Campaigns 0–10 of the K2 mission that are orbiting stars brighter than 13 mag (in Kepler band) and for which we have obtained high-resolution spectra (R = 44,000). These candidates are analyzed using the vespa package in order to calculate their false-positive probabilities (FPP). We find that 149 candidates are validated with an FPP lower than 0.1%, 39 of which were previously only candidates and 56 of which were previously undetected. The processes of data reduction, candidate identification, and statistical validation are described, and the demographics of the candidates and newly validated planets are explored. We show tentative evidence of a gap in the planet radius distribution of our candidate sample. Comparing our sample to the Kepler candidate sample investigated by Fulton et al., we conclude that more planets are required to quantitatively confirm the gap with K2 candidates or validated planets. This work, in addition to increasing the population of validated K2 planets by nearly 50% and providing new targets for follow-up observations, will also serve as a framework for validating candidates from upcoming K2 campaigns and the Transiting Exoplanet Survey Satellite, expected to launch in 2018.