Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979acasn..20...33d&link_type=abstract
Acta Astronomica Sinica, vol. 20, Mar. 1979, p. 33-42. In Chinese, with abstract in English.
Astronomy and Astrophysics
Astronomy
Asteroids, Cosmology, Planetary Evolution, Solar System, Temperature Distribution, Chemical Composition, Interplanetary Dust, Jupiter (Planet)
Scientific paper
A hypothesis is proposed whereby the initial temperature distribution of the nebular disk about the primordial sun produced a transition region between the asteroids and Jupiter in which 'icy' matter transformed from the uncondensed to the condensed state. The resulting discontinuous chemical composition would have made the projected surface density of the solid condensate in the inner Jupiter region larger than the mean value in the asteroid region, the dust layers in both regions would break up into particle clusters due to gravitational instability, and each cluster would become a planetesimal. It is suggested that perturbations and mutual encounters of large planetesimals in the inner Jupiter region changed their orbits and that some of these planetesimals entered the asteroid region, drew off most of the matter there, and increased the random velocity of the remaining asteroids, so that they could not combine to form a planet. The feasibility of this hypothesis is demonstrated via a quantitative analysis.
Dai Wu-Sheng
Hu W.-Z.
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