Velocity Evolution of Planetesimals: Unified Analytical Formulas and Comparisons with N-Body Simulations

Details Velocity Evolution of Planetesimals: Unified Analytical Formulas and Comparisons with N-Body Simulations Velocity Evolution of Planetesimals: Unified Analytical Formulas and Comparisons with N-Body Simulations

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000icar..143...28s&link_type=abstract

Icarus, Volume 143, pp. 28-44 (2000).

Astronomy and Astrophysics

Astronomy

56

Scientific paper

Analytical formulas are derived for the rates of evolution of the mean square orbital eccentricities and inclinations of a general population of planetesimals. For planetesimals on crossing orbits, the derivations based upon the local-velocity formalism of P. Hornung et al. (1985, Icarus 64, 295-307) and upon the Hill-variable formalism of S. Ida et al. (1993, Mon. Not. R. Astron. Soc.) and H. Tanaka and S. Ida (1995, Icarus 120, 371-386) are reconciled and some minor errors in the earlier work are corrected. The corrected analytical theory is compared with a series of N-body simulations of one- and two-component planetesimal systems. For planetesimals on noncrossing orbits, the contribution to velocity evolution is found to be about two times as large as was previously estimated. In addition, N-body simulatiuons show that the rate of dynamical friction is about 30% less effective at driving two-component systems toward equipartition of random kinetic energy than is estimated by the theory. When these adjustments are made to the theory, we find remarkable agreement with the N-body simulations. These results essentially support previously published estimates for the time scale of runaway accretion of planetary embryos.

Affiliated with

Also associated with

No associations

Rating

Velocity Evolution of Planetesimals: Unified Analytical Formulas and Comparisons with N-Body Simulations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Velocity Evolution of Planetesimals: Unified Analytical Formulas and Comparisons with N-Body Simulations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Velocity Evolution of Planetesimals: Unified Analytical Formulas and Comparisons with N-Body Simulations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-807045