Astrophysics

Talk: Florian Kirchschlager (University College London)

Nov 18, 2019 from 01:00 PM to 02:30 PM

LS15 / R. 138

Dust processing by the reverse shock in the supernova remnant Cassiopeia A

 

Dust grains form in the ejecta of core collapse supernovae. However, due to interactions of the blast wave with the circumstellar and interstellar medium, reverse shocks will traverse the ejecta which could potentially destroy large amounts of the newly formed dust material by sputtering or grain-grain collisions. Hydrodynamic simulations help us to model the temporal evolution of gas density and temperature for the passage of a reverse shock in a clumpy supernova ejecta. Subsequently, dust trajectories and destruction rates can be computed using our newly developed post-processing code Paperboats, which includes gas and plasma drag, grain charging, sputtering, gas accretion, and grain-grain collisions. Unlike many other studies, both sputtering and grain-grain collisions are considered as destruction processes, providing a more complete picture of the dust evolution.

The oxygen-rich supernova remnant Cassiopeia A - one of the best studied dusty supernova remnants - provides a unique laboratory to investigate the destruction of dust by the reverse shock. I will present destruction rates as a function of initial grain sizes and gas densities for this unique system. The results show that grain-grain collisions and sputtering are synergistic and that grain-grain collisions can play a crucial role in determining the surviving dust budget in supernova remnants.

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