Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dda....39.1512h&link_type=abstract
American Astronomical Society, DDA meeting #39, #15.12
Astronomy and Astrophysics
Astronomy
Scientific paper
Being the remnants of the accretion and collision of approximately seventy 20-500 km-sized bodies, iron meteorites provide the best clues to the nature of the collisions among planetesimals and planetary embryos, and the initial stage of accretion and growth of these objects in our solar system. The parent bodies of iron meteorites were traditionally, 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 are currently uncommon in that area. This implies that the iron meteorites’ parent bodies probably formed in the inner part of the solar system, and were scattered into the main belt through collisions and interactions with the protoplanets and the remaining planetesimals (Bottke et al 2006). An important effect that strongly influences the efficiency of this scattering is the perturbation of a growing giant planet. We have constructed a comprehensive model of the growth and scattering of meteorites’ parent bodies by numerically integrating the orbits of a few thousand planetesimals and several hundred planetary embryos in the vicinity of a growing giant planet. The results of our simulations, which complement those by Bottke et al (2006), indicate a transitional range for the mass of the growing giant body ( 50M⊕) above which the perturbative effect of this object plays a strong role in the scattering of planetesimals and decreases the efficiency of the delivery of the parent bodies of iron meteorites to the asteroid belt. I will present the details of our study and discuss the applicability of our results within the context of the core-accretion and disk instability models of giant planets formation.
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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