Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.3206h&link_type=abstract
American Astronomical Society, DPS meeting #39, #32.06; Bulletin of the American Astronomical Society, Vol. 39, p.474
Astronomy and Astrophysics
Astronomy
Scientific paper
Traditionally, the parent bodies of iron meteorites are assumed to have formed, differentiated, and subsequently been disrupted in the main asteroid belt. Observational evidence, however, does not support this assumption and indicates that differentiated bodies or their fragments were not common in that area. According to Hf-W isotope constraints, cores formed in most iron meteorite parent bodies in less then 1 Myr after CAI formation. Recently, Bottke et al. (2006) suggested that the iron meteorite parent bodies probably formed inside 2 AU. The protoplanets in that region underwent collisions with the remaining planetesimals and scattered some of these objects into the main belt. In this paper, we investigate this scenario and present the results of numerical simulations of the accretion and scattering of planetesimals, under the influence of protoplanets in the inner solar system and the gravitational perturbation of a growing Jupiter. We numerically integrated the orbits of several hundred Moon- to Mars-sized objects, randomly placed between 0.5 and 1.3 AU and 2 and 3 AU, along with a suite of planetesimals between 0.5 and 3 AU, for different values of the mass of Jupiter (0.01 to 5 Jupiter-mass). Results of simulations for 2 Myr indicate that a few percent of the protoplanets and some of the planetesimals are indeed scattered into the asteroid belt region. Extension of the integrations beyond 2 Myr shows that the growing Jupiter will have significant effect on the accretion and scattering of objects in the region between 1.3 and 2 AU, especially when it reaches a mass of a few hundred Earth-masses. We present the results of our simulations and discuss their applicability to understanding meteorite chronologies.
This work is supported by the NASA Astrobiology Institute under the cooperative agreement NNA04CC08A at the Institute for Astronomy at the University of Hawaii.
Haghighipour Nader
Scott Edward
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