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LSQ13ddu: a rapidly evolving stripped-envelope supernova with early circumstellar interaction signatures

Clark, Peter, Maguire, Kate, Inserra, Cosimo ORCID:, Prentice, Simon, Smartt, Stephen J, Contreras, Carlos, Hossenizadeh, Griffin, Hsiao, Eric Y, Kankare, Erkki, Kasliwal, Mansi, Nugent, Peter, Shahbandeh, Melissa, Baltay, Charles, Rabinowitz, David, Arcavi, Iair, Ashall, Chris, Burns, Christopher R, Callis, Emma, Chen, Ting-Wan, Diamond, Tiara, Fraser, Morgan, Howell, D Andrew, Karamehmetoglu, Emir, Kotak, Rubina, Lyman, Joseph, Morrell, Nidia, Phillips, Mark, Pignata, Giuliano, Pursiainen, Miika, Sollerman, Jesper, Stritzinger, Maximilian, Sullivan, Mark and Young, David 2020. LSQ13ddu: a rapidly evolving stripped-envelope supernova with early circumstellar interaction signatures. Monthly Notices of the Royal Astronomical Society 492 (2) , pp. 2208-2228. 10.1093/mnras/stz3598

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This paper describes the rapidly evolving and unusual supernova LSQ13ddu, discovered by the La Silla-QUEST survey. LSQ13ddu displayed a rapid rise of just 4.8 ± 0.9 d to reach a peak brightness of −19.70 ± 0.02 mag in the LSQgr band. Early spectra of LSQ13ddu showed the presence of weak and narrow HeI HeI features arising from interaction with circumstellar material (CSM). These interaction signatures weakened quickly, with broad features consistent with those seen in stripped-envelope SNe becoming dominant around two weeks after maximum. The narrow HeI HeI velocities are consistent with the wind velocities of luminous blue variables but its spectra lack the typically seen hydrogen features. The fast and bright early light curve is inconsistent with radioactive 56Ni powering but can be explained through a combination of CSM interaction and an underlying 56Ni decay component that dominates the later time behaviour of LSQ13ddu. Based on the strength of the underlying broad features, LSQ13ddu appears deficient in He compared to standard SNe Ib.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Oxford University Press
ISSN: 0035-8711
Date of First Compliant Deposit: 3 April 2020
Date of Acceptance: 20 December 2019
Last Modified: 08 May 2023 16:52

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