K2第一阶段候选者的恒星和行星性质和17颗行星的确认，包括一颗接受类地日射的行星
Stellar and Planetary Properties of K2 Campaign 1 Candidates and Validation of 17 Planets, Including a Planet Receiving Earth-like Insolation
摘要：
扩展后的开普勒任务K2现在每三个月提供一次新领域的测光，以寻找凌日行星。在最近的一项研究中，福尔曼-麦基和合作者提出了一份清单，列出了在K2战役1中围绕31颗恒星运行的36颗行星候选者。在这方面的贡献，我们目前的恒星和行星性质的所有系统。我们结合了地面观测有限的调查数据和自适应光学成像与自动过境分析方案，以验证21个候选行星，17个是第一次，并确定6个候选行星可能是误报。特别令人感兴趣的是K2-18（EPIC 201912552），一颗明亮的（K=8.9）M2.8矮星，拥有一颗2.23 \pm 0.25 R_地球行星，T_eq = 272 \pm 15 K，轨道周期为33天。我们还提出了两个新的开源软件包，使这种分析。第一，等时线，是一个灵活的工具，拟合理论恒星模型的观测数据，以确定恒星的性质，使用嵌套的抽样计划，以捕捉的多峰性质的后验分布的物理参数的恒星，可能是可扩展的演变。第二个是vespa，一个新的通用程序，用于计算假阳性概率和统计验证凌日系外行星。
英文摘要：
The extended Kepler mission, K2, is now providing photometry of new fields every three months in a search for transiting planets. In a recent study, Foreman-Mackey and collaborators presented a list of 36 planet candidates orbiting 31 stars in K2 Campaign 1. In this contribution, we present stellar and planetary properties for all systems. We combine ground-based seeing-limited survey data and adaptive optics imaging with an automated transit analysis scheme to validate 21 candidates as planets, 17 for the first time, and identify 6 candidates as likely false positives. Of particular interest is K2-18 (EPIC 201912552), a bright (K=8.9) M2.8 dwarf hosting a 2.23 \pm 0.25 R_Earth planet with T_eq = 272 \pm 15 K and an orbital period of 33 days. We also present two new open-source software packages which enable this analysis. The first, isochrones, is a flexible tool for fitting theoretical stellar models to observational data to determine stellar properties using a nested sampling scheme to capture the multimodal nature of the posterior distributions of the physical parameters of stars that may plausibly be evolved. The second is vespa, a new general-purpose procedure to calculate false positive probabilities and statistically validate transiting exoplanets.
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。
