Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981icar...45..517n&link_type=abstract
Icarus, vol. 45, Mar. 1981, p. 517-528.
Astronomy and Astrophysics
Astronomy
109
Cosmic Dust, Protoplanets, Solar System, Stellar Evolution, Astronomical Models, Density Distribution, Gravitational Effects, Particle Collisions
Scientific paper
The process of dust grain growth and sedimentation in the primordial solar nebula is investigated for a region near the earth's orbit. The growth equation for dust grains that are sinking as well as in thermal motion is solved numerically, in the wide mass range between 10 to the -12th and 10 to the 6th. Turbulent motions in the nebula are assumed to have already decayed when the sedimentation begins, and it is shown that growth and sedimentation proceed rapidly due to a cooperative interaction between processes. At about 3,000 years after the beginning of the growth and sedimentation process, a dust layer composed of centimeter-sized grains is formed at the equator of the solar nebula. From these results, it may be estimated that 5,000 years after the beginning of sedimentation the dust layer breaks up due to the onset of gravitational instability.
Hayashi Chuichiro
Nakagawa Yasuhiro
Nakazawa Kazuhiro
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