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Shedding light on the Type Ia supernova extinction puzzle: dust location found
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Stockholm University, Faculty of Science, Department of Physics. Stockholm University, Faculty of Science, The Oskar Klein Centre for Cosmo Particle Physics (OKC).
Number of Authors: 32018 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 479, no 3, p. 3663-3674Article in journal (Refereed) Published
Abstract [en]

The colour evolution of reddened Type Ia supernovae can place strong constraints on the location of dust and help address the question of whether the observed extinction stems from the interstellar medium or from circumstellar material surrounding the progenitor. Here, we analyse BV photometry of 48 reddened Type Ia supernovae from the literature and estimate the dust location from their B - V colour evolution. We find a time-variable colour excess E(B - V) for 15 supernovae in our sample and constrain dust to distances between 0.013 and 45 pc (4 x 10(16)-10(20) cm). For the remaining supernovae, we obtain a constant E(B - V) evolution and place lower limits on the dust distance from the explosion. In all the 48 supernovae, the inferred dust location is compatible with an interstellar origin for the extinction. This is corroborated by the observation that supernovae with relatively nearby dust (less than or similar to 1 pc) are located close to the centre of their host galaxy in high-density dusty regions, where interactions between the supernova radiation and interstellar clouds close by are likely to occur. For supernovae showing time-variable E(B - V), we identify a potential preference for low-R-V values, unusually strong sodium absorption, and blue-shifted and time-variable absorption features. Within the interstellar framework, this brings evidence to a proposed scenario, where cloud-cloud collisions induced by the supernova radiation pressure can shift the grain size distribution to smaller values and enhance the abundance of sodium in the gaseous phase.

Place, publisher, year, edition, pages
2018. Vol. 479, no 3, p. 3663-3674
Keywords [en]
circumstellar matter, supernovae: general, dust, extinction
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-160238DOI: 10.1093/mnras/sty1619ISI: 000441382300059OAI: oai:DiVA.org:su-160238DiVA, id: diva2:1249675
Available from: 2018-09-20 Created: 2018-09-20 Last updated: 2018-09-20Bibliographically approved

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Bulla, MattiaGoobar, ArielDhawan, Suhail
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