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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 ofjust 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 weakand narrow He I features arising from interaction with circumstellar material(CSM). These interaction signatures weakened quickly, with broad featuresconsistent with those seen in stripped-envelope SNe becoming dominant aroundtwo weeks after maximum. The narrow He I velocities are consistent with thewind velocities of luminous blue variables but its spectra lack the typicallyseen hydrogen features. The fast and bright early light curve is inconsistentwith radioactive $^{56}$Ni powering but can be explained through a combinationof CSM interaction and an underlying $^{56}$Ni decay component that dominatesthe later time behaviour of LSQ13ddu. Based on the strength of the underlyingbroad features, LSQ13ddu appears deficient in He compared to standard SNe Ib.

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