Condensation of Silicon Carbide in Supernova Ejecta
Date
2017-07-01
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
The American Astronomical Society
Abstract
We present a kinetic model of the formation of silicon carbide (SiC) in the expanding and cooling outflows of Type
II supernova ejecta. We assume an ejecta cloud composed of a mixture of Si, C, and O in the gas phase, with the
initial temperature, density, and composition as tunable parameters. The condensation of diatomic SiC into (SiC)2
molecules provides the abundance of nucleation sites for the eventual condensation of larger SiC solids and dust
grains. We find that the abundance of these nucleation sites, formed after the first 1700 days after the explosion, is
strongly governed by the C/Si ratio, the density of the gas, and the rate of cooling in the ejecta.
Description
© 2017. The American Astronomical Society. All rights reserved.
Final Published Version
Final Published Version
item.page.type
Article
item.page.format
Keywords
Astrochemistry – ISM, Supernova remnants – molecular processes
Citation
Condensation of Silicon Carbide in Supernova Ejecta 2017, 843:57 The Astrophysical Journal