开普勒-11周围一个紧密排列的低质量、低密度行星系统
地球与行星天体物理
2015-05-27 v1
摘要
当一颗系外行星从其恒星前方经过（凌星）时，可根据星光减弱程度测量其半径，并根据凌星间隔时间测量其轨道周期。多颗行星凌星同一颗恒星能揭示更多信息：周期比决定稳定性和动力学，相互引力作用反映行星质量和轨道形状，而观测到的多行星凌星比例对行星系统的共面性具有启示意义。但已知拥有超过一颗凌星行星的恒星很少，且没有恒星拥有三颗以上。本文报告开普勒太空望远镜对一颗类似太阳的恒星的观测结果，揭示了六颗凌星行星，其中五颗的轨道周期在10至47天之间，第六颗周期更长。这五颗内行星是质量和大小均已被测量的最小行星之一，这些测量结果表明它们拥有大量轻气体包层。行星轨道的高度共面性和接近性意味着行星形成末期存在能量耗散。
引用
@article{arxiv.1102.0291,
title = {A Closely-Packed System of Low-Mass, Low-Density Planets Transiting Kepler-11},
author = {Jack J. Lissauer and Daniel C. Fabrycky and Eric B. Ford and William J. Borucki and Francois Fressin and Geoffrey W. Marcy and Jerome A. Orosz and Jason F. Rowe and Guillermo Torres and William F. Welsh and Natalie M. Batalha and Stephen T. Bryson and Lars A. Buchhave and Douglas A. Caldwell and Joshua A. Carter and David Charbonneau and Jessie L. Christiansen and William D. Cochran and Jean-Michel Desert and Edward W. Dunham and Michael N. Fanelli and Jonathan J. Fortney and Thomas N. Gautier and John C. Geary and Ronald L. Gilliland and Michael R. Haas and Jennifer R. Hall and Matthew J. Holman and David G. Koch and David W. Latham and Eric Lopez and Sean McCauliff and Neil Miller and Robert C. Morehead and Elisa V. Quintana and Darin Ragozzine and Dimitar Sasselov and Donald R. Short and Jason H. Steffen},
journal= {arXiv preprint arXiv:1102.0291},
year = {2015}
}
备注
published in Nature