Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 492, Issue 2, Pages 2208-2228Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz3598
Keywords
circumstellar matter; supernovae: general; supernovae: individual: LSQ13ddu
Categories
Funding
- Department for Education
- UK Science and Technology Facility Council through an Ernest Rutherford Fellowship [ST/M005348/1]
- EU/H2020/ERC grant [758638]
- National Science Foundation [AST-1313484, AST-1613472]
- Alexander von Humboldt Foundation
- Royal Society - Science Foundation Ireland University Research Fellowship
- Ministry of Economy, Development, and Tourism's Millennium Science Initiative [IC120009]
- VILLUM FONDEN [13261]
- Independent Research Fund Denmark
- EU/FP7-ERC grant [615929]
- ESO program [188.D-3003]
- USA's National Science Foundation [AST-1613472, AST-0306969, AST-0607438, AST-1008343, AST-1613426, AST-1613455]
- Sapere Aude Level 2 grant - Danish Agency for Science and Technology and Innovation
- NASA's Astrophysics Data Analysis Program [NNX13AF35G]
- UK STFC [PL13B10, PL13B16]
- Science and Technology Facilities Council [ST/P000312/1] Funding Source: researchfish
- STFC [ST/P000495/1, ST/P006892/1, ST/P000312/1, ST/M005348/1, ST/S006176/1] Funding Source: UKRI
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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 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.
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