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Signatures of circumstellar interaction in the Type IIL supernova ASASSN-15oz

Bostroem, K Azalee, Valenti, Stefano, Horesh, Assaf, Morozova, Viktoriya, Kuin, N Paul M, Wyatt, Samuel, Jerkstrand, Anders, Sand, David J., Lundquist, Michael, Smith, Mathew, Sullivan, Mark, Hosseinzadeh, Griffin, Arcavi, Iair, Callis, Emma, Cartier, Régis, Gal-Yam, Avishay, Galbany, Lluís, Gutiérrez, Claudia, Howell, D Andrew, Inserra, Cosimo, Kankare, Erkki, López, Kristhell Marisol, McCully, Curtis, Pignata, Giuliano, Piro, Anthony L., Rodríguez, Ósmar, Smartt, Stephen J., Smith, Kenneth W., Yaron, Ofer and Young, David R. 2019. Signatures of circumstellar interaction in the Type IIL supernova ASASSN-15oz. Monthly Notices of the Royal Astronomical Society 485 (4) , pp. 5120-5141. 10.1093/mnras/stz570

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Abstract

Hydrogen-rich, core-collapse supernovae are typically divided into four classes: IIP, IIL, IIn, and IIb. Recent hydrodynamic modelling shows that circumstellar material is required to produce the early light curves of most IIP/IIL supernovae. In this scenario, IIL supernovae experience large amounts of mass-loss before exploding. We test this hypothesis on ASASSN15oz, a Type IIL supernova. With extensive follow-up in the X-ray, UV, optical, IR, and radio, we present our search for signs of interaction and the mass-loss history indicated by their detection. We find evidence of short-lived intense mass-loss just prior to explosion from light-curve modelling, amounting in 1.5 M of material within 1800 R of the progenitor. We also detect the supernova in the radio, indicating mass-loss rates of 10−6 to 10−7 M yr−1 prior to the extreme mass-loss period. Our failure to detect the supernova in the X-ray and the lack of narrow emission lines in the UV, optical, and NIR do not contradict this picture and place an upper limit on the mass-loss rate outside the extreme period of <10−4 M yr−1. This paper highlights the importance gathering comprehensive data on more Type II supernovae to enable detailed modelling of the progenitor and supernova which can elucidate their mass-loss histories and envelope structures and thus inform stellar evolution models.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 4 June 2019
Date of Acceptance: 19 February 2019
Last Modified: 04 Jun 2019 15:55
URI: http://orca.cf.ac.uk/id/eprint/123158

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