Shrinking binary and planetary orbits by Kozai cycles with tidal friction

  title={Shrinking binary and planetary orbits by Kozai cycles with tidal friction},
  author={D. Fabrycky and S. Tremaine},
  journal={The Astrophysical Journal},
At least two arguments suggest that the orbits of a large fraction of binary stars and extrasolar planets shrank by 1-2 orders of magnitude after formation: (1) the physical radius of a star shrinks by a large factor from birth to the main sequence, yet many main-sequence stars have companions orbiting only a few stellar radii away, and (2) in current theories of planet formation, the region within ~0.1 AU of a protostar is too hot and rarefied for a Jupiter-mass planet to form, yet many hot… Expand

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