Crystallization of Silicate Particles in Circumstellar Disks by Shock Waves

Details Crystallization of Silicate Particles in Circumstellar Disks by Shock Waves Crystallization of Silicate Particles in Circumstellar Disks by Shock Waves

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1158..147n&link_type=abstract

EXOPLANETS AND DISKS: THEIR FORMATION AND DIVERSITY: Proceedings of the International Conference. AIP Conference Proceedings, V

Physics

Circumstellar Shells, Clouds, And Expanding Envelopes, Circumstellar Masers, Planetary Bow Shocks, Interplanetary Shocks, Origin And Evolution

Scientific paper

Crystalline silicate dust particles have been found observationally in some circumstellar disks and in some comets. However, the origin of the crystalline silicates is an unsolved problem, because the progenitors of those dust particles are thought to be amorphous. A plausible theory for the origin of crystalline silicate is the annealing of amorphous particles. Along that line, some annealing mechanisms have been proposed and examined to date. Shock wave heating is one of them, though preferred conditions of shock waves have not been examined generally. In this study, based on the shock-wave heating mechanism, a wide variety of conditions of shock waves, such as the shock velocity and the pre-shock gas density, in which amorphous particles are heated enough to crystallize, were examined using numerical simulations. As a result, conditions of shock waves that are appropriate for annealing have been clarified and summarized. Next, some preferred shock waves that can be generated at the right place with the right velocity are discussed. It is found that some shock waves can be generated and they may be appropriate to anneal amorphous dust particles there. Thus, in a circumstellar disk, it seems possible that amorphous dust particles are annealed and transformed into crystalline particles.

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