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18 April 2024

» arxiv » 1912.5986

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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 Diamond ; Morgan 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 ;
Date:	12 Dec 2019
Abstract:	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$pm$0.9 d to reach a peak brightness of $-$19.70$pm$0.02 mag in the $mathit{LSQgr}$ band. Early spectra of LSQ13ddu showed the presence of 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 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 $^{56}$Ni powering but can be explained through a combination of CSM interaction and an underlying $^{56}$Ni 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.
Source:	arXiv, 1912.5986
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