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SOFIA mid-infrared observations of Supernova 1987A in 2016 - forward shocks and possible dust re-formation in the post-shocked region?

Matsuura, Mikako, De Buizer, James M, Arendt, Richard G, Dwek, Eli, Barlow, M J, Bevan, Antonia, Cigan, Phil, Gomez, Haley L, Rho, Jeonghee, Wesson, Roger, Bouchet, Patrice, Danziger, John and Meixner, Margaret 2018. SOFIA mid-infrared observations of Supernova 1987A in 2016 - forward shocks and possible dust re-formation in the post-shocked region? Monthly Notices of the Royal Astronomical Society 482 (2) , pp. 1715-1723. 10.1093/mnras/sty2734

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Abstract

The equatorial ring of Supernova (SN) 1987A has been exposed to forward shocks from the SN blast wave, and it has been suggested that these forward shocks have been causing on-going destruction of dust in the ring. We obtained SOFIA FORCAST 11.1, 19.7 and 31.5 μm photometry of SN 1987A in 2016. Compared with Spitzer measurements 10 years earlier, the 31.5 μm flux has significantly increased. The excess at 31.5 μm appears to be related to the Herschel 70 μm excess, which was detected 5 years earlier. The dust mass needed to account for the the 31.5–70 μm excess is 3–7× 10−4 M⊙, more than ten times larger than the ring dust mass (∼1 × 10−5 M⊙) estimate from the data 10-years earlier. We argue that dust grains are re-formed or grown in the post-shock regions in the ring after forward shocks have destroyed pre-existing dust grains in the ring and released refractory elements into gas. In the post-shock region, atoms can stick to surviving dust grains, and the dust mass may have increased (grain growth), or dust grains might have condensed directly from the gas. An alternative possibility is that the outer part of the expanding ejecta dust might have been heated by X-ray emission from the circumstellar ring. The future development of this excess could reveal whether grains are reformed in the post-shocked region of the ring or eject dust is heated by X-ray.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 10 October 2018
Date of Acceptance: 1 October 2018
Last Modified: 31 Jan 2019 23:34
URI: http://orca.cf.ac.uk/id/eprint/115748

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