Priestley, F. D., Arias, M., Barlow, M. J. and De Looze, I.
2022.
Dust destruction and survival in the Cassiopeia A reverse shock.
Monthly Notices of the Royal Astronomical Society
509
(3)
, 3163–3171.
10.1093/mnras/stab3195
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Abstract
Core-collapse supernovae (CCSNe) produce large (≳0.1M⊙) masses of dust, and are potentially the primary source of dust in the Universe, but much of this dust may be destroyed before reaching the interstellar medium. Cassiopeia A (Cas A) is the only supernova remnant where an observational measurement of the dust destruction efficiency in the reverse shock is possible at present. We determine the pre- and post-shock dust masses in Cas A using a substantially improved dust emission model. In our preferred models, the unshocked ejecta contains 0.6−0.8M⊙ of 0.1μm silicate grains, while the post-shock ejecta has 0.02−0.09M⊙ of 5−10nm grains in dense clumps, and 2×10−3M⊙ of 0.1μm grains in the diffuse X-ray emitting shocked ejecta. The implied dust destruction efficiency is 74−94percent in the clumps and 92−98percent overall, giving Cas A a final dust yield of 0.05−0.30M⊙. If the unshocked ejecta grains are larger than 0.1μm, the dust masses are higher, the destruction efficiencies are lower, and the final yield may exceed 0.5M⊙. As Cas A has a dense circumstellar environment and thus a much stronger reverse shock than is typical, the average dust destruction efficiency across all CCSNe is likely to be lower, and the average dust yield higher. This supports a mostly stellar origin for the cosmic dust budget.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Physics and Astronomy |
Publisher: | Royal Astronomical Society |
ISSN: | 0035-8711 |
Date of First Compliant Deposit: | 1 December 2021 |
Date of Acceptance: | 30 October 2021 |
Last Modified: | 10 May 2023 12:56 |
URI: | https://orca.cardiff.ac.uk/id/eprint/145764 |
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