Azalee Bostroem, K;
Valenti, S;
Horesh, A;
Morozova, V;
Kuin, NPM;
Wyatt, S;
Jerkstrand, A;
... Young, DR; + view all
(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 ASASSN-15oz, 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.
| Type: | Article |
|---|---|
| Title: | Signatures of circumstellar interaction in the Type IIL supernova ASASSN-15oz |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stz570 |
| Publisher version: | https://doi.org/10.1093/mnras/stz570 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Techniques: imaging spectroscopy, stars: late-type, supernovae: general, supernovae: individual: ASASSN-15oz, stars: winds, outflows |
| 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 Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10076791 |
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