Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.6605w&link_type=abstract
American Astronomical Society, DPS meeting #38, #66.05; Bulletin of the American Astronomical Society, Vol. 38, p.617
Astronomy and Astrophysics
Astronomy
Scientific paper
The Late Heavy Bombardment has been ascribed to passage of Saturn through the 2:1 commensurability resonance with Jupiter 0.8 Gy after the formation of the Solar System (Gomes et al. 2005, Nature 435, 466). The slow planetary migration is assumed to be caused by gravitational scattering of planetesimals originally present in a massive disk beyond the original orbits of Uranus and Neptune, containing about 35 Earth masses distributed between 15 and 30 AU. The orbital evolution simulations of Gomes et al. allow the swarm to be depleted only by planetary encounters. However, these bodies would be subject to collisions during this interval, which can result in mass loss from the swarm and/or accretion of large bodies. The inner edge of the swarm is stirred by perturbations of the outermost giant planet; if the planetesimals are too small, collisional disruption may deplete the swarm and halt the migration. A multi-zone collisional code with fragmentation is used to model the evolution of the swarm during the slow migration of the outer planets. The results constrain the initial sizes and orbital distributions that are consistent with the survival of the swarm, and the accretion of bodies as large as Pluto and Triton.
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