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2009•AIP conference proceedingsRequires access

A Model for Low Temperature Crystallization of Silicate Dust in Protoplanetary Disks

Tetsuo Yamamoto, Kyoko K. Tanaka, Tomonori Usuda, Motohide Tamura, Miki Ishii

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Abstract

We analyzed the mechanism of low‐temperature crystallization of an amorphous silicate grain due to exothermic chemical reactions in the surface layer of the grains as demonstrated experimentally (Kaito et al. 2007, ApJ. 666, L57). We constructed a model of the crystallization and derived the crystallization conditions of the amorphous silicate core of the grain. The analysis enables us to obtain the crystallization conditions in protoplanetary disks. Our results suggest that silicate crystallization occurs in a wider variety of conditions than hitherto considered.

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What this paper is about

We analyzed the mechanism of low‐temperature crystallization of an amorphous silicate grain due to exothermic chemical reactions in the surface layer of the grains as demonstrated experimentally (Kaito et al. 2007, ApJ. 666, L57). We constructed a model of the crystallization and derived the crystallization conditions of the amorphous silicate core of the grain. The analysis enables us to obtain the crystallization conditions in protoplanetary disks. Our results suggest that silicate crystallization occurs in a wider variety of conditions than hitherto considered.

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Available abstract

We analyzed the mechanism of low‐temperature crystallization of an amorphous silicate grain due to exothermic chemical reactions in the surface layer of the grains as demonstrated experimentally (Kaito et al. 2007, ApJ. 666, L57). We constructed a model of the crystallization and derived the crystallization conditions of the amorphous silicate core of the grain. The analysis enables us to obtain the crystallization conditions in protoplanetary disks. Our results suggest that silicate crystallization occurs in a wider variety of conditions than hitherto considered.

Key concepts: Crystallization, Silicate, Amorphous solid, Exothermic reaction, Materials science, Chemical engineering, Grain size, Silicate glass

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