Disruption of Planetary Orbits Through Evection Resonance with an External Companion: Circumbinary Planets and Multiplanet Systems

Abstract

Planets around binary stars and those in multiplanet systems may experience resonant eccentricity excitation and disruption due to perturbations from a distant stellar companion. This "evection resonance" occurs when the apsidal precession frequency of the planet, driven by the quadrupole associated with the inner binary or the other planets, matches the orbital frequency of the external companion. We develop an analytic theory to study the effects of evection resonance on circumbinary planets and multiplanet systems. We derive the general conditions for effective eccentricity excitation or resonance capture of the planet as the system undergoes long-term evolution. Applying to circumbinary planets, we show that inward planet migration may lead to eccentricity growth due to evection resonance with an external perturber, and planets around shrinking binaries may not survive the resonant eccentricity growth. On the other hand, significant eccentricity excitation in multiplanet systems occurs in limited parameter space of planet and binary semimajor axes, and requires the planetary migration to be sufficiently slow.

arXiv comment15 pages, 16 figures

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Cited by in corpus (16)

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• Eccentricities and Inclinations of Multi-Planet Systems with External Perturbers
• Populations of planets in multiple star systems
• Mass, Density, and Formation Constraints in the Compact, Sub-Earth Kepler-444 System including Two Mars-Mass Planets
• Migration of Planets Into and Out of Mean Motion Resonances in Protoplanetary Disks: Analytical Theory of Second-Order Resonances
• Hot Jupiter and ultra-cold Saturn formation in dense star clusters
• The binary mass ratios of circumbinary planet hosts
• Blackhole Mergers Through Evection Resonances
• Hot Jupiter formation in dense clusters: secular chaos in multi-planetary systems
• The Structure and Stability of Extended, Inclined Circumplanetary Disk or Ring Systems
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• Could there be an undetected inner planet near the stability limit in Kepler-1647?
• Exciting mutual inclination in planetary systems with a distant stellar companion: the case of Kepler-108
• The Number of Transits Per Epoch for Transiting Misaligned Circumbinary Planets