Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sf2a.conf..249s&link_type=abstract
SF2A-2009: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics, held 29 June - 4 July 2009 in
Astronomy and Astrophysics
Astrophysics
Scientific paper
We use a 1-dimensional hydrodynamic code to simulate the global evolution of Saturn's Rings through viscous spreading, including satellites torques. While previous studies, using constant viscosities, suggest a rapid spread out of the ring system in a few hundred million years (Esposito 1986), we show that new viscosity prescriptions derived from N-body simulations such as the one of Daisaka et al. (2001) would dramatically affect the large scale evolution of the ring system, allowing for a survival of the rings over 5 billion years. We show also that transitions form self-gravitating to non self-gravitating regions would produce large scale structures. Surprisingly the final state of the ring system seems somewhat independent of the initial mass using the viscosity of Daisaka et al. (2001). The possibility of confinement by nearby satellites is still under investigation but first results suggest that they could significantly lengthen the rings viscous age.
Brahic Andre
Charnoz Sebastien
Crida Aurelien
Salmon Joseph
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