2020/08/12 by Philip J. Carter, Carter, Philip J., Sarah T. Stewart +1 · 2 citations
Earth and Planetary Sciences · Physics and Astronomy · #Astro and Planetary Science #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Geological and Geochemical Analysis #High-pressure geophysics and materials
paper · pdf · doi:10.48550/arxiv.2008.05549
openalex publication_date 2020/08/12 · openalex created_date 2022/07/24 · openalex updated_date 2026/07/28
Giant planet migration is an important phenomenon in the evolution of\nplanetary systems. Recent works have shown that giant planet growth and\nmigration can shape the asteroid belt, but these works have not considered\ninteractions between planetesimals. We have calculated the evolution of\nplanetesimal disks, including planetesimal-planetesimal collisions, during gas\ngiant growth and migration. The numbers, locations, and impact velocities of\nthese collisions depend on the specific growth and migration path. We find that\ngiant planet growth alone has little effect on impact velocities, and most of\nthe planetesimals scattered by growing giants do not undergo collisions with\neach other during the growth period. In contrast, we find that giant planet\nmigration induces large numbers of high velocity collisions between\nplanetesimals. These impacts have sufficient velocities to cause shock-induced\nvaporization for both water ice and silicate components of planetesimals, and\nto cause catastrophic disruption of the bodies. New bodies may form from impact\ndebris. Collisional evolution reduces the efficiency of planetesimal\nimplantation into the asteroid belt via giant planet growth and migration. A\nsmall fraction of the largest planetesimals implanted into the asteroid belt\nwould have been processed via collisions. We identify important consequences of\nplanetesimal collisions that have not been considered in planet accretion\nmodels. The prevalence of high velocity collisions during giant planet\nmigration, and their potential links to the properties of meteorites, and the\nformation of chondrules, makes impact vaporization a critically important\nphenomenon. The consequences of vaporizing planetesimal constituents require\nfurther detailed study. New collision outcome models for impacts within the\nnebula, and models for new planetesimal formation are needed.\n