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Dust destruction and survival in the Cassiopeia A reverse shock

Priestley, FD; Arias, M; Barlow, MJ; De Looze, I; (2021) Dust destruction and survival in the Cassiopeia A reverse shock. Monthly Notices of the Royal Astronomical Society 10.1093/mnras/stab3195. (In press). Green open access

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Abstract

Core-collapse supernovae (CCSNe) produce large (≳ 0.1 M⊙) 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 − 0.8 M⊙ of 0.1 μm silicate grains, while the post-shock ejecta has 0.02 − 0.09 M⊙ of 5 − 10 nm grains in dense clumps, and 2 × 10−3 M⊙ of 0.1 μm grains in the diffuse X-ray emitting shocked ejecta. The implied dust destruction efficiency is 74−94% in the clumps and 92−98% overall, giving Cas A a final dust yield of 0.05 − 0.30 M⊙. If the unshocked ejecta grains are larger than 0.1 μm, the dust masses are higher, the destruction efficiencies are lower, and the final yield may exceed 0.5 M⊙. 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.

Type: Article
Title: Dust destruction and survival in the Cassiopeia A reverse shock
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stab3195
Publisher version: https://doi.org/10.1093/mnras/stab3195
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher's terms and conditions.
Keywords: supernovae: individual: Cassiopeia A, dust, extinction, ISM: supernova remnants, ISM: evolution
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/10137903
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