The destruction of dust grains in collisions of a supernova with a circumstellar medium

Astronomy and Astrophysics – Astronomy

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Cosmic Dust, Interstellar Matter, Interstellar Radiation, Particle Collisions, Stellar Envelopes, Supernovae, Density Distribution, Grain Size, Infrared Radiation, Supernova Remnants

Scientific paper

Dust grains exist, if not abundantly, in systems composed of a Type II supernova and a circumstellar medium (CSM). The grains, however, may subsequently suffer intense sputtering by X-ray emitting plasmas during the collision of the supernova ejecta with the CSM. An approximate expression is obtained for the amount of grain erosion in both the blast-shocked CSM and the reverse-shocked ejecta, assuming their self-similar interaction. The distortion of the grain size distribution is also calculated. In the remnant of SN 1979c, the population of the grains of radius 0.1 micron, for example, will be diminished substantially in both the ejecta and the CSM, while in the remnant of SN 1980k, it will be affected considerably only in the ejecta. The infrared fluxes expected from the blast-shocked CSM are roughly estimated. The present destruction mechanism may be responsible for the severe under-abundance of dust in the Cassiopeia A supernova remnant.

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