Other
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.539..419g&link_type=abstract
In: Proceedings of the Conference on Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets, 22-25 A
Other
Dust, Planetesimals, Accretion Disk
Scientific paper
The trajectories of dust particles in a proto-planetary nebula are calculated both analytically and numerically, as they undergo settling and radial infall due to gas drag. The analytical formulae are combined with a Boltzmann averaging procedure to obtain the evolutionary behaviour of a collection of particles of various sizes. It is found that a selective segregation process occurs in which all intermediate size particles (typically of the order of a centimeter at 1AU, and increasingly larger further out) very quickly settle to the mid-plane, whereas smaller particles remain at all heights in the disk. The Boltzmann formalism is also used to derive the correct averaged equations of motion for a "fluid" composed of the dust grains; we deduce a typical particle size above which the standard fluid equation of motion fails to reproduce the behaviour of this collection of particles.
Barrière-Fouchet Laure
Garaud Pascale
Lin Douglas N. C.
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