Other
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dps....40.2108s&link_type=abstract
American Astronomical Society, DPS meeting #40, #21.08; Bulletin of the American Astronomical Society, Vol. 40, p.424
Other
Scientific paper
Large moonlets embedded in a planetary ring can create gaps going around the whole circumference almost void of material. Two examples have been identified in Saturn's A-ring to date: Pan in the Encke gap and Daphnis in the Keeler gap. The gravity of the moons induces wavy-like structures (wakes) at the gap edges. Observations by the ISS imaging team revealed deviations of the edge form from the basic sinusoidal model. Gap edges perturbed by resonances, and alternatively, a moonlet on an eccentric orbit are suitable to explain the observations.
Here we present results of N-particle box simulations of a gap edge including collisions where the edge is perturbed by a moonlet on an eccentric orbit. We especially compare the results with analytical predictions and non-collisional streamline kinematics. Further, the resulting streamlines are compared with the corresponding density isolines, showing that both can deviate significantly from each other. Additionally, based on these numerical experiments we investigate the damping behavior at the gap edge and draw conclusions for the analytical modeling of the wakes and for interpretation of Cassini data.
Salo Heikki
Schmidt Jonas
Seiss Martin
Spahn Frank
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