Viscosity of a Planetesimal Disk Due to Gravitational Encounters

Details Viscosity of a Planetesimal Disk Due to Gravitational Encounters Viscosity of a Planetesimal Disk Due to Gravitational Encounters

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002dda....33.0708o&link_type=abstract

American Astronomical Society, DDA Meeting #33, #07.08; Bulletin of the American Astronomical Society, Vol. 34, p.937

Other

Scientific paper

We study the rate of radial diffusion of planetesimals due to gravitational encounters. We calculate the viscosity in a swarm of equal-sized planetesimals using three-body orbital integrations, and obtain a semi-analytic expression that reproduces these numerical results. We find that the viscosity is independent of the velocity dispersion of planetesimals when the velocity dispersion is so small that Kepler shear dominates planetesimals' relative velocities. On the other hand, in high velocity cases where random velocities dominate the relative velocities, the viscosity is a decreasing function of the velocity dispersion. We also calculate the rate of radial diffusion of planetesimals due to gravitational perturbation by a protoplanet. Using these results, we obtain a condition of gap formation by a protoplanet embedded in a planetesimal disk, which can explain the results of previous N-body simulations.

Affiliated with

Also associated with

No associations

Rating

Viscosity of a Planetesimal Disk Due to Gravitational Encounters 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 Viscosity of a Planetesimal Disk Due to Gravitational Encounters, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Viscosity of a Planetesimal Disk Due to Gravitational Encounters will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1043232