Showing papers by "Nanjing University published in 1979"

On the origin of the asteroids.

Abstract: Initial temperature distribution of the nebulous disk around the sun led to the bordering region between the asteroids and Jupiter becoming a transitory region, in which the“icy”matter changed from uncondensed state to condensed state. The discontinuity in chemical constitution makes the projected surface density of solid condensate in the inner portion of the Jupiter region bigger than the mean value in the asteroid region, and the time taken for dust particle to precipitate becomes comparable to that in the asteroid region. Owing to gravitational instability, the dust layer then broke up into clusters of particles, each cluster transforming into a planetesimal. The mass of such plenetesimal and the rate of its growth in the Jupiter region are bigger than those in the asteroid region. Perturbation and mutual encounter between large planetesimals in the inner portion of the Jupiter region, changed their orbits, and produced rather large relative velocity. Part of such planetesimals entered the asteroid region, drew out most of the matter there, and increased the random velocity of the asteroids that remained, so they could not combine to form a planet. We prove the above view through quantitative analysis in this paper.