Monday

Transient surveys have discovered a wide range of new objects that do not fit the standard behaviour of known classes of astronomical phenomena. In particular, high cadence surveys such as Pan-STARRS1 and ATLAS are uncovering and constraining the behaviour of ‘fast’ transients showing significant change on the time scale of a few days that have up to now been unobserved in lower cadence surveys. I present new analysis of the photometric and spectroscopic behaviour of the unusual supernova LSQ13ddu. It showed a rapid rise time of 5 days to a peak magnitude of – 19.6 followed by a fast decline post maximum. The rapid rise triggered an active spectroscopic and photometric follow-up campaign primarily via PESSTO revealing LSQ13ddu to share spectral features with several types of interacting stripped-core supernovae – narrow He features accompanied by broader emission features similar to those seen in broad line Ics, some of which have been linked to GRBs. The next generation of transient surveys such as the LSST may reveal a range of objects with similar hybrid properties with LSQ13ddu providing a glimpse into the potential zoo of odd objects awaiting discovery.