Other
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010dda....41.0303g&link_type=abstract
American Astronomical Society, DDA meeting #41, #3.03; Bulletin of the American Astronomical Society, Vol. 41, p.927
Other
Scientific paper
The Asteroid Belt's largest member, Ceres, appears to be consist of a rocky core surrounded by an icy veneer. Until recently an object of this nature would have been viewed less as asteroidal and more as cometary in nature. Models have suggested that gas drag in the early solar nebula could cause small icy particles to drift inwards from beyond the orbit of Jupiter (Mousis et. al. and others). A requirement of this scenario is that the particles must drift inwards quickly enough that they are not vaporized by their proximity to the sun interior to the frost line. Might the volatiles have been delivered during a later stage of planetary evolution, when icy planetesimals had grown to substantially larger sizes? Using a high-order multistep integrator, we simulated the trajectories and evoultions of 10,000 planetesimals in each of the inter-planet gaps in the presence of the jovian planets. We also integrated 1500 planetesimals in the presence of jovian "embryos". We find that owing to close encounters with the jovian planets a high percentage of particles--over 60% of those originating between Jupiter and Saturn--at some point in their lives evolve to have perihelia within the Asteroid Belt. Since a planetesimal in this scenario would have a higher thermal interia than a small grain, as well as a higher velocity, which circumvents the problem of vaporization and could prove to be a more efficient way of delivering volatile compounds to the inner Solar System. Collisions between these objects and objects within asteroid belt could have emplanted ices onto asteroids like Ceres.
Castillo-Rogez Julie C.
Grazier Kevin R.
Sharp P.
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