Other
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dda....41.1006m&link_type=abstract
American Astronomical Society, DDA meeting #41, #10.06; Bulletin of the American Astronomical Society, Vol. 41, p.939
Other
Scientific paper
Planetesimal-driven migration has come to be understood as an important process in the evolution of the orbits of the giant planets. Could planetesimal-driven migration also be important process in the evolution of the orbits of the terrestrial planets? We investigate here whether planetesimal-driven migration may have been important while rocky planetary embryos were accreting within in a massive swarm of planetesimals in the inner solar system. The conditions under which terrestrial planet embryo migration can occur are relatively narrow. First, embryos (defined as lunar to Mars-mass bodies) must be able to preferentially form in some regions of the planetesimal disk before others. Second, the rate of migration must be high enough that migrating embryos can reach embryo-free zones of the disk before new embryos have a chance to grow there. If these conditions were met within the terrestrial planet accretion disk, then embryo migration may be an important component of the formation history of the terrestrial planets. In particular, the outward migration of Mars may have populated the inner asteroid belt with planetesimals, directly analogous to the resonant Kuiper belt objects that were presumably populated by Neptune's outward migration. These resonant objects may have been an important contributor to terrestrial planet impacts when they became unstable due to the migration of the outer giant planets.
Bottke William F.
Levison Harold F.
Minton David A.
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