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

Peter Clark, Kate Maguire, Cosimo Inserra, Simon Prentice, Stephen J. Smartt, Carlos Contreras, Griffin Hossenizadeh, Eric Y. Hsiao, Erkki Kankare, Mansi Kasliwal, Peter Nugent, Melissa Shahbandeh, Charles Baltay, David Rabinowitz, Iair Arcavi, Chris Ashall, Christopher R. Burns, Emma Callis, Ting-Wan Chen, Tiara DiamondMorgan Fraser, D. Andrew Howell, Emir Karamehmetoglu, Rubina Kotak, Joseph Lyman, Nidia Morrell, Mark Phillips, Giuliano Pignata, Miika Pursiainen, Jesper Sollerman, Maximilian Stritzinger, Mark Sullivan, David Young

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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 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 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.
Original languageEnglish
Pages (from-to)2208-2228
JournalMonthly Notices of the Royal Astronomical Society
Issue number2
Publication statusPublished - 01 Feb 2020


  • circumstellar matter
  • supernovae: general
  • supernovae: individual: LSQ13ddu


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