Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21840206m&link_type=abstract
American Astronomical Society, AAS Meeting #218, #402.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Planetesimals, the building blocks of planetary embryos, must grow before gas is dispersed from their natal protoplanetary disks. Due to their different aerodynamic properties, planetesimals of varying sizes and shapes experience different drag forces from the gas during this time. Such differential forces produce a wind-shearing effect, which generates an effective acceleration between nearby planetesimals of different sizes. For any two planetesimals, a wind-shearing radius can be considered, at which the differential acceleration due to the wind becomes greater than the mutual gravitational pull between the planetesimals. We demonstrate that this wind-shearing radius can be much smaller than the gravitational shearing radius by the star (the Hill radius). We then discuss the role of wind-shearing for the stability and survival of binary planetesimals, and provide stability criteria for binary planetesimals embedded in a gaseous disk.
Murray-Clay Ruth
Perets Hagai
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