On the tidal dissipation of obliquity

T. M. Rogers, D. N.C. Lin

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

We investigate tidal dissipation of obliquity in hot Jupiters. Assuming an initial random orientation of obliquity and parameters relevant to the observed population, the obliquity of hot Jupiters does not evolve to purely aligned systems. In fact, the obliquity evolves to either prograde, retrograde, or 90°orbits where the torque due to tidal perturbations vanishes. This distribution is incompatible with observations which show that hot Jupiters around cool stars are generally aligned. This calls into question the viability of tidal dissipation as the mechanism for obliquity alignment of hot Jupiters around cool stars.

Original languageEnglish (US)
Article numberL10
JournalAstrophysical Journal Letters
Volume769
Issue number1
DOIs
StatePublished - May 20 2013

Keywords

  • planet-star interactions
  • planets and satellites: dynamical evolution and stability
  • planets and satellites: formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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