Planetesimal Migration in the Outer Solar System and the Composition of the Scattered Disk

Details Planetesimal Migration in the Outer Solar System and the Composition of the Scattered Disk Planetesimal Migration in the Outer Solar System and the Composition of the Scattered Disk

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dda....38.1003g&link_type=abstract

American Astronomical Society, DDA meeting #38, #10.03

Astronomy and Astrophysics

Astronomy

Scientific paper

In a previous work (Grazier et al. 2001), we explored the migration of planetesimals in the early outer Solar System. Using a high-order modified Störmer multistep integrator, we integrated the trajectories of 10,000 particles in each of the gaps of the outer planets for up to 12 My. In those simulations, close planet/planetesimal approaches were integrated with a high-accuracy Störmer-based close approach method, and data from all close approaches were stored in a large database--allowing us to recreate the migration history of any single planetesimal, or re-integrate any single close approach. Tracking the evolution of the planetesimal swarm allows us to examine the relative number of planetesimals which migrate to the Edgeworth-Kuiper Belt (EKB) or Oort Cloud, as well as the amount of cometary material delivered to the inner Solar System.
In addition to extending those integrations to 100 My, we now also integrate the trajectories--and capture the evolution history--of 3000 particles originating in the EKB. Presently the EKB is viewed as an amalgam of two overlying populations - the classic Kuiper Belt Objects and the Scattered Disk Objects (SDOs). One unexpected result from our simulations was that a population with orbital elements consistent with the SDOs evolved from objects that originated from within the orbit of Neptune. This result suggests that the evolution of the Edgeworth-Kuiper Belt is even more dynamically complicated than previously thought.

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