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).
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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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