KEPLER-68: THREE PLANETS, ONE WITH A DENSITY BETWEEN THAT OF EARTH AND ICE GIANTS

@article{Gilliland2013KEPLER68TP,
  title={KEPLER-68: THREE PLANETS, ONE WITH A DENSITY BETWEEN THAT OF EARTH AND ICE GIANTS},
  author={Ronald L. Gilliland and Geoffrey W. Marcy and Jason F. Rowe and Leslie A. Rogers and Guillermo Torres and François Fressin and Eric D. Lopez and Lars A. Buchhave and J{\o}rgen Christensen-Dalsgaard and Jean-Michel D{\'e}sert and Christopher E. Henze and Howard T. Isaacson and Jon M. Jenkins and Jack Lissauer and William J. Chaplin and Sarbani Basu and Travis S. Metcalfe and Yvonne P. Elsworth and Rasmus Handberg and Saskia Hekker and Daniel Huber and Christoffer Karoff and Hans Kjeldsen and Mikkel N. Lund and Mia S Lundkvist and Andrea Miglio and David Charbonneau and Eric B. Ford and Jonathan J. Fortney and Michael R. Haas and Andrew W. Howard and Steve B. Howell and Darin Ragozzine and Susan E. Thompson},
  journal={The Astrophysical Journal},
  year={2013},
  volume={766}
}
NASA's Kepler Mission has revealed two transiting planets orbiting Kepler-68. Follow-up Doppler measurements have established the mass of the innermost planet and revealed a third Jovian-mass planet orbiting beyond the two transiting planets. Kepler-68b, in a 5.4 day orbit, has M⊕, R⊕, and g cm−3, giving Kepler-68b a density intermediate between that of the ice giants and Earth. Kepler-68c is Earth-sized, with a radius R⊕ and transits on a 9.6 day orbit; validation of Kepler-68c posed unique… 

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