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Article Dans Une Revue Icarus Année : 2010

Moonlet Induced Wakes in Planetary Rings: Analytical Model Including Eccentric Orbits of Moon and Ring Particles

Résumé

Saturn's rings host two known moons, Pan and Daphnis, which are massive enough to clear circumferential gaps in the ring around their orbits. Both moons create wake patterns at the gap edges by gravitational deflection of the ring material Cuzzi and Scargle(1985), Showalter et al(1986)). New Cassini observations revealed that these wavy edges deviate from the sinusoidal waveform, which one would expect from a theory that assumes a circular orbit of the perturbing moon and neglects particle interactions. Resonant perturbations of the edges by moons outside the ring system, as well as an eccentric orbit of the embedded moon, may partly explain this behavior Porco et al (2005):weiss et al.(2005, 2009) ). Here we present an extended non-collisional streamline model which accounts for both effects. We describe the resulting variations of the density structure and the modification of the nonlinearity parameter . Furthermore, an estimate is given for the applicability of the model. We use the streamwire model introduced by Stewart1991 to plot the perturbed ring density at the gap edges.
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Dates et versions

hal-00683832 , version 1 (30-03-2012)

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M. Seiss, F. Spahn, Jürgen Schmidt. Moonlet Induced Wakes in Planetary Rings: Analytical Model Including Eccentric Orbits of Moon and Ring Particles. Icarus, 2010, 210 (1), pp.298. ⟨10.1016/j.icarus.2010.06.013⟩. ⟨hal-00683832⟩

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