KOLLMEIER, Juna A.; RAYMOND, Sean N.

doi:10.1093/mnrasl/sly219

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KOLLMEIER, Juna A.

RAYMOND, Sean N.
ECLIPSE 2019

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Ce document a été publié dans

Monthly Notices of the Royal Astronomical Society: Letters. 2019, vol. 483, n° 1, p. L80-L84

Oxford Journals

Résumé en anglais

Each of the giant planets within the Solar System has large moons but none of these moons have their own moons (which we call submoons). By analogy with studies of moons around short-period exoplanets, we investigate the dynamical stability of submoons. We find that 10 km-scale submoons can only survive around large (1000 km-scale) moons on wide-separation orbits. Tidal dissipation destabilizes the orbits of submoons around moons that are small or too close to their host planet; this is the case for most of the Solar System's moons. A handful of known moons are, however, capable of hosting long-lived submoons: Saturn's moons Titan and Iapetus, Jupiter's moon Callisto, and Earth's Moon. Based on its inferred mass and orbital separation, the newly-discovered exomoon candidate Kepler-1625b-I can, in principle, host submoons, although its large orbital inclination may pose a difficulty for dynamical stability. The existence, or lack thereof, of submoons, may yield important constraints on satellite formation and evolution in planetary systems.< Réduire

Mots clés en anglais

Astrophysics - Earth and Planetary Astrophysics

DOI

http://dx.doi.org/10.1093/mnrasl/sly219

Project ANR

Modélisation du processus de croissance des planètes Joviennes/ - ANR-13-BS05-0003

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Importé de hal

Unités de recherche

Laboratoire d'Astrophysique de Bordeaux (LAB) - UMR 5804