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.
@article{arxiv.1912.05986,
title = {LSQ13ddu: A rapidly-evolving stripped-envelope supernova with early circumstellar interaction signatures},
author = {Peter Clark and Kate Maguire and Cosimo Inserra and Simon Prentice and Stephen J. Smartt and Carlos Contreras and Griffin Hossenizadeh and Eric Y. Hsiao and Erkki Kankare and Mansi Kasliwal and Peter Nugent and Melissa Shahbandeh and Charles Baltay and David Rabinowitz and Iair Arcavi and Chris Ashall and Christopher R. Burns and Emma Callis and Ting-Wan Chen and Tiara Diamond and Morgan Fraser and D. Andrew Howell and Emir Karamehmetoglu and Rubina Kotak and Joseph Lyman and Nidia Morrell and Mark Phillips and Giuliano Pignata and Miika Pursiainen and Jesper Sollerman and Maximilian Stritzinger and Mark Sullivan and David Young},
journal= {arXiv preprint arXiv:1912.05986},
year = {2020}
}
Comments
22 pages, 20 figures; accepted for publication in MNRAS