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Hot Jupiters from secular planet–planet interactions

Author

Listed:
  • Smadar Naoz

    (Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University)

  • Will M. Farr

    (Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University)

  • Yoram Lithwick

    (Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University)

  • Frederic A. Rasio

    (Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University)

  • Jean Teyssandier

    (Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA), Northwestern University)

Abstract

The formation of retrograde hot Jupiters About one-quarter of the known hot Jupiter exoplanets are orbiting in the 'wrong direction', or counter to the spin axis of the host star. Attempts to explain this phenomenon have so far failed. It is known that in triple-star systems, retrograde orbits of this type can be produced by the long-term effects of stellar perturbations. An analysis of the motions of planetary bodies, including octupole-order effects and tidal friction, suggest that a similar mechanism may be operating involving planets rather than stars. The new model proposes a mechanism called Kozai capture, in which long-term interactions with a more-distant planet can naturally produce close-in planets with retrograde orbits, through forces familiar in the Kozai mechanism that are thought to cause the high eccentricities observed in the orbits of exosolar planets.

Suggested Citation

  • Smadar Naoz & Will M. Farr & Yoram Lithwick & Frederic A. Rasio & Jean Teyssandier, 2011. "Hot Jupiters from secular planet–planet interactions," Nature, Nature, vol. 473(7346), pages 187-189, May.
    • Handle: RePEc:nat:nature:v:473:y:2011:i:7346:d:10.1038_nature10076
    DOI: 10.1038/nature10076
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