A closely packed system of low-mass, low-density planets transiting Kepler-11

@article{Lissauer2011ACP,
  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 François 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 D{\'e}sert and Edward Wood Dunham and Michael Nicholas Fanelli and Jonathan J. Fortney and Thomas Gautier and John Charles 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 D. Lopez and Sean D. McCauliff and Neil Miller and Robert C. Morehead and Elisa V. Quintana and Darin Ragozzine and Dimitar D. Sasselov and Donald R. Short and Jason H. Steffen},
  journal={Nature},
  year={2011},
  volume={470},
  pages={53-58}
}
When an extrasolar planet passes in front of (transits) its star, its radius can be measured from the decrease in starlight and its orbital period from the time between transits. Multiple planets transiting the same star reveal much more: period ratios determine stability and dynamics, mutual gravitational interactions reflect planet masses and orbital shapes, and the fraction of transiting planets observed as multiples has implications for the planarity of planetary systems. But few stars have… 

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