Early Formation of the Saturnian System?

Details Early Formation of the Saturnian System? Early Formation of the Saturnian System?

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agusm.p43a..08c&link_type=abstract

American Geophysical Union, Spring Meeting 2007, abstract #P43A-08

Physics

6024 Interiors (8147), 6280 Saturnian Satellites, 8147 Planetary Interiors (5430, 5724, 6024)

Scientific paper

Recent observations have provided clues that the Saturnian satellites formed early enough so that short-lived radiogenic isotopes accreted with them and played an important role in their thermophysical evolution. Using the date when calcium-aluminum inclusions (CAIs), as seen in some meteorites, were created as our time reference, we have deduced times of formation for Iapetus, Mimas, and Enceladus. These consistently fall in the interval between 2 and 5 My after CAIs were formed. Using these dates in the initial conditions for thermophysical models yield scenarios that can explain Iapetus' shape, and solve the Cold-Mimas / Hot-Enceladus paradox. The results are also consistent with interior models proposed for Titan and interpretations of Rhea's gravity field measurements. These results also have implications for the age of Saturn and the formation of the outer solar system. Acknowledgements: This work was carried out at the Jet Propulsion Laboratory-California Institute of Technology, under contract to NASA.

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