Dust Destruction By The Reverse Shock In The Cassiopeia A Supernova Remnant

Details Dust Destruction By The Reverse Shock In The Cassiopeia A Supernova Remnant Dust Destruction By The Reverse Shock In The Cassiopeia A Supernova Remnant

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21934305m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #343.05

Astronomy and Astrophysics

Astronomy

Scientific paper

It has been demonstrated by observations that young supernovae (SNe) are indeed able to efficiently synthesize dust. However, the total dust mass estimated from observations is still orders of magnitude lower than the amount of dust predicted by models. At the same time, SNe represent the major agent responsible for dust destruction. Because SNe are possibly the only viable dust factory in the early Universe, it is extremely important to establish the origin of this discrepancy. It could be that the models of dust coagulation in supernova ejecta need to be corrected, or that the dust is present but undetectable, due to environmental conditions or technical limitations. It is also possible that a significant fraction of the newly formed dust is destroyed within the supernova remnant. Our work explores this latter option.
In the Cassiopeia A supernova remnant, dust emission has been observed associated with the optical knots containing recently formed material. The dust present in the clumps is threatened by the reverse shock traveling through the ejecta toward the center of the supernova. The shock is able to disrupt the clumps and will inject the dust grains into a hot gas, where they will be eroded and possibly destroyed by thermal and inertial sputtering. We present a model that describes the propagation of the reverse shock into the supernova cavity and evaluates the destruction of the newly formed dust, taking into account the variation of the physical properties of both the shock and the ejecta across the remnant.

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