Tracing the Origins of the Solar System
Tracing the origin of the Solar System Michel Blanc OAMP, Marseille This talk was prepared with highly appreciated contributions from : Yann Alibert, Antonella Barucci, Willy Benz, Dominique Bockelée-Morvan,Scott Bolton, Angioletta Coradini, Alain Doressoundiram, Michel Festou, Daniel Gautier, Tristan Guillot, Philippe Lamy, Alessandro Morbidelli, Toby Owen, Christophe Sotin. 2 A « Cosmic Vision » Can one trace back this formation history along of the Solar the paths of chemical System compounds ? The Solar Nebula Circumstellar disks Jovian planets’ Rocky Small nebulae Pegasides planets bodies Terrestrial exoplanets ? Icy Jovian satellites planets Rings and tori 3 Our view of Solar System objects at the dawn of the XXIst century Neptune The inner solar system (Plot prepared by the Minor Planets Center, december 2003) 4 A large population of small bodies in the outer solar system Where did it come from ? 5 (Courtesy A. Doressoundiram) What radial density profile for the Nebula ? 6 1 – The Solar Nebula Turbulence maintains some degree of mixing •Hand He throughout, lost to ISM after ~10 Myrs • Volatiles : rare gases, N2,… Hot inner nebula : Cold outer nebula : Condensates dominated Condensates dominated by metal and silicate by ices of H2O, compounds hydrates of C and N 2 - The inner solar system : accretion of metal and silicate condensates In the early solar nebula, the Dust dust accreted to form rocks and Proto-Planets the rocks accreted to form planetary embryos. In the asteroid belt this process was stopped when Jupiter formed. Accretion
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