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LSQ13ddu: a rapidly evolving stripped-envelope supernova with early circumstellar interaction signatures
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Number of Authors: 332020 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 492, no 2, p. 2208-2228Article in journal (Refereed) Published
Abstract [en]

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 He I 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 He I 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 Ni-56 powering but can be explained through a combination of CSM interaction and an underlying Ni-56 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.

Place, publisher, year, edition, pages
2020. Vol. 492, no 2, p. 2208-2228
Keywords [en]
circumstellar matter, supernovae: general, supernovae: individual: LSQ13ddu
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-179545DOI: 10.1093/mnras/stz3598ISI: 000512297600048OAI: oai:DiVA.org:su-179545DiVA, id: diva2:1412052
Available from: 2020-03-05 Created: 2020-03-05 Last updated: 2020-03-05Bibliographically approved

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Chen, Ting-WanKaramehmetoglu, EmirSollerman, Jesper
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Department of AstronomyThe Oskar Klein Centre for Cosmo Particle Physics (OKC)
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