On The Accretion Of Planetesimals In Circumbinary Disks

Details On The Accretion Of Planetesimals In Circumbinary Disks On The Accretion Of Planetesimals In Circumbinary Disks

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1001t&link_type=abstract

American Astronomical Society, DPS meeting #38, #10.01; Bulletin of the American Astronomical Society, Vol. 38, p.493

Astronomy and Astrophysics

Astronomy

Scientific paper

Following our recent work on the circumprimary case (Thebault, Marzari, Scholl, 2006, Icarus, 183, 193), we investigate the conditions for accretion of planetesimals in a circumbinary disk. We explore the distribution of relative velocities in a swarm of planetesimals with sizes ranging from 0.1 to 100 km, under the coupled influence of gravitational perturbations of the binary and gas drag. Gas drag has two major effects on planetesimals: 1) orbits are circularized and spiral inward 2) Orbits of planetesimals of the same size have their periastron aligned in a specific size-dependent direction. As a result, relative velocities among small planetesimals of the same size may drop to almost zero whereas relative velocities among bodies of different sizes increase due to differential orbital alignment. Various orbital parameters and mass ratios for the binary system are explored. We derive relative velocity maps around the binary and determine regions where are small enough to favor accretion.

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