Resonant Removal of Exomoons During Planetary Migration

Abstract

Jupiter and Saturn play host to an impressive array of satellites, making it reasonable to suspect that similar systems of moons might exist around giant extrasolar planets. Furthermore, a significant population of such planets is known to reside at distances of several Astronomical Units (AU), leading to speculation that some moons thereof might support liquid water on their surfaces. However, giant planets are thought to undergo inward migration within their natal protoplanetary disks, suggesting that gas giants currently occupying their host star's habitable zone formed further out. Here we show that when a moon-hosting planet undergoes inward migration, dynamical interactions may naturally destroy the moon through capture into a so-called "evection resonance." Within this resonance, the lunar orbit's eccentricity grows until the moon eventually collides with the planet. Our work suggests that moons orbiting within about 10 planetary radii are susceptible to this mechanism, with the exact number dependent upon the planetary mass, oblateness and physical size. Whether moons survive or not is critically related to where the planet began its inward migration as well as the character of inter-lunar perturbations. For example, a Jupiter-like planet currently residing at 1AU could lose moons if it formed beyond 5AU. Cumulatively, we suggest that an observational census of exomoons could potentially inform us on the extent of inward planetary migration, for which no reliable observational proxy currently exists.

6 Figures, Accepted for Publication in The Astrophysical Journal

References in corpus (10)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Accretion disc viscosity: how big is alpha?
• On the Luminosity of Young Jupiters
• The fast spin-rotation of a young extrasolar planet
• Transit timing effects due to an exomoon
• Planetary Candidates Observed by Kepler V: Planet Sample from Q1-Q12 (36 Months)
• The Migration of Gap-Opening Planets is not Locked to Viscous Disk Evolution
• Formation, Habitability, and Detection of Extrasolar Moons
• The formation of the Galilean moons and Titan in the Grand Tack scenario
• The Possible Moon of Kepler-90g is a False Positive

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• The Structure and Stability of Extended, Inclined Circumplanetary Disk or Ring Systems
• Collisional formation of massive exomoons of super-terrestrial exoplanets
• Consequences of dynamically unstable moons in extrasolar systems
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• Special cases : moons, rings, comets, trojans