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arXiv 1102.0543astro-ph.EP
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开普勒候选多凌日行星系统的结构和动力学

Architecture and Dynamics of Kepler's Candidate Multiple Transiting Planet Systems

Jack J. Lissauer, Darin Ragozzine, Daniel C. Fabrycky, Jason H. Steffen, Eric B. Ford, Jon M. Jenkins, Avi Shporer, Matthew J. Holman, Jason F. Rowe, Elisa V. Q… 展开作者

Jack J. Lissauer, Darin Ragozzine, Daniel C. Fabrycky, Jason H. Steffen, Eric B. Ford, Jon M. Jenkins, Avi Shporer, Matthew J. Holman, Jason F. Rowe, Elisa V. Quintana, Natalie M. Batalha, William J. Borucki, Stephen T. Bryson, Douglas A. Caldwell, Joshua A. Carter, David Ciardi, Edward W. Dunham, Jonathan J. Fortney, Thomas N. Gautier, Steve Howell, David G. Koch, David W. Latham, Geoffrey W. Marcy, Robert C. Morehead, Dimitar Sasselov

摘要:

在\ik数据的前四个月里发现的大约1200颗凌日行星候选者中,约有三分之一是多个候选系统的成员。有115颗目标恒星有两颗候选凌日行星,45颗有三颗,8颗有四颗,5颗和6颗各有一颗。我们描述了这些候选多行星系统的动力学性质。观测到的周期比的分布表明,绝大多数的候选人对既不是在也不是附近的低阶平均运动共振。尽管如此,存在小的但统计上显著的过量的候选对,其在共振中以及间隔开得稍微太远而不能共振,特别是在2:1共振附近。我们发现,几乎所有的候选系统是稳定的,测试数值积分,假设一个名义上的质量半径关系。几个考虑强烈地表明,这些多候选系统中的绝大多数是真正的行星系。使用观察到的多重性频率,我们发现,一个单一的人口的行星系,匹配较高的多重性低估了单凌日系统的数量。我们提供了多候选系统的真实多重性和相互倾斜分布的限制,揭示了多个超级地球大小和海王星大小的行星具有低到中等相互倾斜的系统人口。

英文摘要:

About one-third of the ~1200 transiting planet candidates detected in the first four months of \ik data are members of multiple candidate systems. There are 115 target stars with two candidate transiting planets, 45 with three, 8 with four, and one each with five and six. We characterize the dynamical properties of these candidate multi-planet systems. The distribution of observed period ratios shows that the vast majority of candidate pairs are neither in nor near low-order mean motion resonances. Nonetheless, there are small but statistically significant excesses of candidate pairs both in resonance and spaced slightly too far apart to be in resonance, particularly near the 2:1 resonance. We find that virtually all candidate systems are stable, as tested by numerical integrations that assume a nominal mass-radius relationship. Several considerations strongly suggest that the vast majority of these multi-candidate systems are true planetary systems. Using the observed multiplicity frequencies, we find that a single population of planetary systems that matches the higher multiplicities underpredicts the number of singly-transiting systems. We provide constraints on the true multiplicity and mutual inclination distribution of the multi-candidate systems, revealing a population of systems with multiple super-Earth-size and Neptune-size planets with low to moderate mutual inclinations.

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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