NDLI: Resonant Removal of Exomoons during Planetary Migration

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Resonant Removal of Exomoons during Planetary Migration

Content Provider	Semantic Scholar
Author	Spalding, Christopher Batygin, Konstantin Adams, Fred C.
Copyright Year	2015
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 1 AU could lose moons if it formed beyond ∼ 5 AU. 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.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://authors.library.caltech.edu/64987/2/Spalding_2016p18.pdf
Alternate Webpage(s)	http://authors.library.caltech.edu/64987/1/1511.09472v1.pdf
Language	English
Access Restriction	Open
Subject Keyword	Censuses Direct inward dial Distance (graph theory) GUCY2C protein, human Gigantism Interaction Moon Planetary scanner Reside Resonance Satellite Viruses
Content Type	Text
Resource Type	Article

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