AGGREGATION OF SiC-X GRAINS IN SUPERNOVA EJECTA

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Deneault_2009_Combined_ApJ_705_1215.pdf (321.76 KB)

Date

2009-10-20

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Publisher

The American Astronomical Society

Abstract

We present a model for the formation of silicon carbide aggregates within the expanding and cooling supernova remnant. SiC type-X (SiC-X) grains measured in the laboratory at a high spatial resolution have been found to be aggregates of smaller crystals which are isotopically homogenous. The initial condensation of SiC in the ejecta occurs within an interior dense shell of material which is created by a reverse shock which rebounds from the core–envelope interface. A subsequent reverse shock accelerates the grains forward, but the gas drag from the ejecta on the rapidly moving particles limits their travel distance. By observing the effects of gas drag on the travel distance of grains, we propose that supernova grain aggregates form from material that condensed in a highly localized region, which satisfies the observational evidence of isotopic homogeneity in SiC-X grains.

Description

© 2009. The American Astronomical Society. All rights reserved
Final Published Version

Keywords

Supernova remnants – infrared, Stars – astrochemistry

Citation

AGGREGATION OF SiC-X GRAINS IN SUPERNOVA EJECTA 2009, 705: 1215-1218 TheAstrophysical Journal

URI

http://hdl.handle.net/20.500.11868/569

DOI

https://doi.org/10.1088/0004-637X/705/2/1215

Collections

2009 CNHS Faculty Publications