利用CB-BLS在CoRoT和地基数据中寻找凌日环双星
Searching For Transiting Circumbinary Planets in CoRoT and Ground-Based Data Using CB-BLS
摘要：
目标。我们在食双星（EBs）周围寻找凌日环双星（CB）行星。方法. CB-BLS算法是近年来提出的一种用于探测绕EBs运行的CB类行星的算法，本文介绍了CB-BLS算法在搜索灵敏度、通用性和性能方面的研究进展，以及CB-BLS算法在模拟数据上的探测试验。我们还描述了一个分析方法的CB-BLS检测限的确定，和正确的去趋势的内在变星的方法。结果我们提出了一些盲目的测试与模拟行星注入到真正的CoRoT数据。CB-BLS的升级使其能够成功检测所有盲法检测，并且这些检测符合检测限分析。我们还正确地从TrES行星搜索的观测中降低了明亮的食双星的趋势，并提出了将CB-BLS应用于宽视场调查的多个真实光变曲线的一些初步结果。结论. CB-BLS现在已经足够成熟，可以应用于实际数据，所提出的处理方案将作为我们未来将CB-BLS应用于宽场调查（如CoRoT）数据的模板。即使是在没有探测到的情况下，也能够限制CB行星的出现，这将有助于确定CB行星的正确频率，从而有助于对行星形成的一般理解。尽管如此，寻找过境CB行星仍然是一个学习的经验，类似于几年前围绕单恒星的过境行星的状态。最近在这方面的快速进展，加上天基测光的精致质量，可以现实地期望，如果存在过境CB行星，那么它们很快就会被发现。
英文摘要：
Aims. We search for transiting circumbinary (CB) planets around eclipsing binaries (EBs). Methods. CB-BLS is a recently-introduced algorithm for the detection of transiting CB planets around EBs.We describe progress in search sensitivity, generality and capability of CB-BLS, and detection tests of CB-BLS on simulated data. We also describe an analytical approach for the determination of CB-BLS detection limits, and a method for the correct detrending of intrinsically-variable stars. Results. We present some blind-tests with simulated planets injected to real CoRoT data. The presented upgrades to CB-BLS allowed it to detect all the blind tests successfully, and these detections were in line with the detection limits analysis. We also correctly detrend bright eclipsing binaries from observations by the TrES planet search, and present some of the first results of applying CB-BLS to multiple real light curves from a wide-field survey. Conclusions. CB-BLS is now mature enough for its application to real data, and the presented processing scheme will serve as the template for our future applications of CB-BLS to data from wide-field surveys such as CoRoT. Being able to put constraints even on non-detection will help to determine the correct frequency of CB planets, contributing to the understanding of planet formation in general. Still, searching for transiting CB planets is still a learning experience, similarly to the state of transiting planets around single stars only a few years ago. The recent rapid progress in this front, coupled with the exquisite quality of space-based photometry, allows to realistically expect that if transiting CB planets exist - then they will soon be found.
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