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Angular momentum of two collided rarefied preplanetesimals and formation of binaries

Published online by Cambridge University Press:  06 April 2010

Sergei I. Ipatov
Sergei I. Ipatov*
Affiliation:
Catholic University of America, Washington DC, USA email: [email protected] Space Research Institute, Moscow, Russia
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Abstract

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The mean angular momentum associated with the collision of two celestial objects moving in almost circular heliocentric orbits was studied. The results of these studies were used to develop models of the formation of binaries at the stage of rarefied preplanetesimals. The models can explain a greater fraction of binaries formed at greater distances from the Sun. Sometimes there could be two centers of contraction inside the rotating preplanetesimal formed as the result of a collision between two rarefied preplanetesimals. Such formation of binaries could result in binaries with almost the same masses of components separated by a large distance. Formation of a disk around the primary could result because the angular momentum that was obtained by a rarefied preplanetesimal formed by collision was greater than the critical angular momentum for a solid body. One or several satellites of the primary could be formed from the disk.

Keywords

Minor planetsasteroidsKuiper Beltsolar system: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S263: Icy Bodies of the Solar System , August 2009 , pp. 37 - 40
Copyright
Copyright © International Astronomical Union 2010

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