OVERSTABLE LIBRATIONS CAN ACCOUNT FOR THE PAUCITY OF MEAN MOTION RESONANCES AMONG EXOPLANET PAIRS
Peter Goldreich & Hilke E. Schlichting (2014)
- Published
- Jan 9, 2014
- Journal
- The Astronomical Journal · Vol. 147 · No. 2
- DOI
- 10.1088/0004-6256/147/2/32
At a GlanceAI
Proposes overstability of resonant librations as a mechanism that breaks many exoplanet pairs out of mean-motion resonance.
SummaryAI
Many close-in exoplanet pairs sit near, but not exactly in, mean-motion resonances, creating a longstanding puzzle for migration-based formation scenarios. Goldreich and Schlichting argue that resonant librations can become overstable, growing in amplitude until planets escape resonance, naturally reducing the number of resonant pairs. This provides a theoretical pathway that reconciles resonance capture with the observed paucity of resonant exoplanet systems. The idea implies that resonance statistics can constrain how dissipation (e.g., tidal damping) operates during or after migration.
Method SnapshotAI
Analytical dynamical modeling of resonant motion with dissipative effects to assess the stability of librations and the likelihood of resonance escape.
BackgroundAI
Celestial mechanics of mean-motion resonances, basic orbital migration/dissipation concepts, and dynamical stability of libration around resonance.