The Value of Systems with Multiple Transiting Planets
The Value of Systems with Multiple Transiting Planets
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具有多个凌日行星的系统的价值
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
M. Holman
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作者：
D. Ragozzine;M. Holman
除其他事项外，目前对行星系统形成和演化的研究利用了两个重要的观测资源：对凌日行星的精确描述，以及多行星系统的频率和性质。迄今为止，除了考虑其他行星对凌日光曲线的影响（主要是通过凌日时间变化（TTVs））之外，对凌日系外行星的研究几乎完全集中在只有一颗行星的系统上。这项工作考虑了多个行星被看到凌日同一颗恒星的系统，并得出结论，这种“多凌日”系统将是除了我们自己的太阳系之外信息最丰富的行星系统。Steffen等人在2010年宣布了\emph{开普勒}望远镜发现的5个新的候选多过境系统，尽管这些候选系统还没有被完全确认为行星。在预期可能确认的多过境系统，我们详细讨论了这些系统的价值。例如，在多过境系统中，对过境时间变化的正确解释得到了显著改善。真正的相互倾斜度是对行星形成的一个有价值的探测，在某些系统中也可以很好地确定，特别是通过罗西特-麦克劳克林对每个行星的测量。此外，这样的系统可能会经历可预测和可观察的相互事件，其中一颗行星穿过另一颗行星，这允许对各种物理和轨道参数的独特约束，特别是相互倾角。
Among other things, studies of the formation and evolution of planetary systems currently draw on two important observational resources: the precise characterization available for planets that transit their parent stars and the frequency and nature of systems with multiple planets. Thus far, the study of transiting exoplanets has focused almost exclusively on systems with only one planet, except for considering the influence of additional planets on the transit light curve, mostly through transit timing variations (TTVs). This work considers systems where multiple planets are seen to transit the same star and concludes that such "multi-transiting" systems will be the most information-rich planetary systems besides our own solar system. Five new candidate multi-transiting systems from \emph{Kepler} have been announced in Steffen et al. 2010, though these candidates have not yet been fully confirmed as planets. In anticipation of the likely confirmation of multi-transiting systems, we discuss the value of these systems in detail. For example, proper interpretation of transit timing variations is significantly improved in multi-transiting systems. The true mutual inclination, a valuable probe of planetary formation, can also be well determined in certain systems, especially through Rossiter-McLaughlin measurements of each planet. In addition, such systems may undergo predictable and observable mutual events, where one planet crosses over the other, which allow for unique constraints on various physical and orbital parameters, particularly the mutual inclination.