Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011sf2a.conf...15c&link_type=abstract
SF2A-2011: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: G. Alecian, K. Belkacem,
Astronomy and Astrophysics
Astrophysics
Planetary Formation, Planetary Migration, Protoplanetary Disks, Planet-Disk Interactions, Planet: Saturn, Saturn: Rings
Scientific paper
In this plenary session talk, I review some of the most important recent progresses in planetary science. I focus here on two aspects linked to planetary formation. In section ref{crida:sec:pm}, I present the issue of planetary migration of type I. After an introduction to planet-disk interactions, I present the differential Lindblad torque, responsible for a too fast inward migration of terrestrial planets. Then, the corotation torque is presented. It is shown that the total torque is positive in the inner regions of the disk, and negative in the outer regions, leading to a convergence of terrestrial planets to an equilibrium radius. In section ref{crida:sec:Sat}, I present a new scenario for the formation of Saturn's rings and satellites. New results suggest that the rings were initially very massive, made of pieces of the icy mantle of differentiated satellite that migrated into Saturn at the time of solar system formation. These rings then spread viscously, and reach the observed mass and density in about 4 Gyrs. As a by-product of this spreading, all the satellites inside the orbit of Titan form beyond the Roche limit and then migrate to their present position.
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