Condensation process of silicate vapor at chondrule formation.

Abstract

In the stage of chondrule formation in the protoplanetary disk, smaller grains would reach the melting point earlier and could vaporize while larger grains are in the process of melting. In this study, we examine the process of condensation, especially competition between homogeneous nucleation and formation of core-mantle type grains due to heterogeneous nucleation. We obtained an analytic expression of the condition to form new dust grains by the homogeneous nucleation. The condition gives a new constraint on the mechanism of chondrule formation.