Ridge Formation And De-spinning Of Iapetus Via An Impact-generated Satellite

Details Ridge Formation And De-spinning Of Iapetus Via An Impact-generated Satellite Ridge Formation And De-spinning Of Iapetus Via An Impact-generated Satellite

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011dda....42.0808l&link_type=abstract

American Astronomical Society, DDA meeting #42, #8.08; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present a scenario for building the equatorial ridge and
de-spinning Iapetus through an impact-generated disk and satellite.
This impact puts debris into orbit, forming a ring inside the Roche
limit and a satellite outside. This satellite rapidly pushes the ring
material down to the surface of Iapetus, and then itself tidally
evolves outward, thereby helping to de-spin Iapetus. This scenario
can de-spin Iapetus an order of magnitude faster than when tides due
to Saturn act alone, almost independently of its interior geophysical
evolution. Eventually, the satellite is stripped from its orbit by
Saturn. The range of satellite and impactor masses required is
compatible with the estimated impact history of Iapetus.

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