Crystallization of Silicate Particles by Shock Waves

Details Crystallization of Silicate Particles by Shock Waves Crystallization of Silicate Particles by Shock Waves

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005hia....13..525n&link_type=abstract

Highlights of Astronomy, Vol. 13, as presented at the XXVth General Assembly of the IAU - 2003 [Sydney, Australia, 13 - 26 July

Astronomy and Astrophysics

Astronomy

Scientific paper

A dust particle in a gas medium can be heated by shock waves: fundamental heating processes are the drag heating the conduction from the hot gas and the radiation. We have developed a detailed numerical model of the mechanism in which many physical and chemical processes are taken into account appropriately: included are 1-dimensional plane-parallel gas flow chemical reactions among 35 gas species radiation from gas molecules/atoms and dust particles gas drag force drag heating heat conduction between gas and dust particles evaporation of dust and so forth. Using the model we systematically explored conditions of shock waves the shock velocity and the pre-shock gas density with which dust particles can be crystallized. The change of chemical composition of the gas was paid attention as well. We obtained the critical condition of shock waves for the crystallization. With the critical condition we can examine if a shock generating mechanism and an environment in the solar nebula are responsible for the crystallization of dust particles. We looked into continuous accretion shock clumpy accretion shocks bow shocks in front of eccentric planetesimals and gravitational density waves. It seems that some dust crystallization scenarios may be possible.

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