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Crystallization of Silicate Particles By Shock Waves

Published online by Cambridge University Press:  30 March 2016

Taishi Nakamoto  and
Hitoshi Miura
Taishi Nakamoto
Affiliation:
Center for Computational Physics, University of Tsukuba, Tsukuba 305-8577, Japan
Hitoshi Miura
Affiliation:
Center for Computational Physics, University of Tsukuba, Tsukuba 305-8577, Japan

Abstract

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Crystalline silicate dust particles have been found in some comets, though progenitors of those dust particles are thought to be amorphous. Here, the origin of the crystalline particles was investigated based on the shock-wave heating mechanism. We find that appropriate shock waves can crystallize amorphous dust particles and conditions of these shock waves (shock velocity and pre-shock gas density) are clarified.

The gas density in the solar nebula and the shock velocity that may be induced in comet forming regions by some mechanisms were discussed. It was suggested that comets formed in a region closer than about 20 AU to the Sun can contain the crystalline particles, whereas comets formed in a further region can hardly have them.

Type
I. Joint Discussions
Information
Highlights of Astronomy , Volume 13 , 2005 , pp. 525 - 527
Copyright
Copyright © Astronomical Society of Pacific 2005

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