Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p51c1148e&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P51C-1148
Physics
[6008] Planetary Sciences: Comets And Small Bodies / Composition, [6040] Planetary Sciences: Comets And Small Bodies / Origin And Evolution, [6218] Planetary Sciences: Solar System Objects / Jovian Satellites, [6280] Planetary Sciences: Solar System Objects / Saturnian Satellites
Scientific paper
We interpret satellite accretion in terms of a two-component gaseous subnebula, as in the SEMM model of Mosqueira and Estrada (2003a,b). Ablation and capture of planetesimal fragments crossing the gaseous circumplanetary disks delivers enough collisional rubble to account for the mass budgets of the regular satellites of Jupiter and Saturn. This process can result in rock/ice fractionation provided the makeup of the population of disk crossers is non-homogeneous, thus offering a natural explanation for the marked compositional differences between outer solar nebula objects and those that accreted in the subnebulae of the giant planets. Because rocky (unlike icy) fragments crossing the outer disks of Jupiter and Saturn never reach a temperature high enough to ablate either due to melting or vaporization, our model leads to an enhancement of the ice content of Iapetus, and to a lesser degree those of Titan, Callisto and Ganymede, and accounts for the (non-stochastic) compositions of these large, low-porosity outer regular satellites of Jupiter and Saturn (Mosqueira, Estrada and Charnoz 2009, submitted). For this to work, the primordial population of ~ 10 km planetesimals in the Jupiter-Saturn region must be partially differentiated, so that the ensuing collisional cascade produces an icy population of ~ 1 m size fragments to be ablated during subnebula crossing. To this end, we invoke the presence of Al26 in the first generation of planetesimals. This work is supported by NASA PG&G and OPR grants.
Charnoz Sebastien
Estrada Paul R.
Mosqueira Ignacio
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