On the relative sizes of planets within kepler multiple-candidate systems

David R. Ciardi, Daniel C. Fabrycky, Eric B. Ford, T. N. Gautier, Steve B. Howell, Jack J. Lissauer, Darin Ragozzine, Jason F. Rowe

Research output: Contribution to journalArticlepeer-review

79 Scopus citations


We present a study of the relative sizes of planets within the multiple-candidate systems discovered with the Kepler mission. We have compared the size of each planet to the size of every other planet within a given planetary system after correcting the sample for detection and geometric biases. We find that for planet pairs for which one or both objects are approximately Neptune-sized or larger, the larger planet is most often the planet with the longer period. No such size-location correlation is seen for pairs of planets when both planets are smaller than Neptune. Specifically, if at least one planet in a planet pair has a radius of ≳ 3 R, 68% ± 6% of the planet pairs have the inner planet smaller than the outer planet, while no preferred sequential ordering of the planets is observed if both planets in a pair are smaller than ≲ 3 R.

Original languageEnglish (US)
Article number41
JournalAstrophysical Journal
Issue number1
StatePublished - Jan 20 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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