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While interaction with circumstellar material is known to play an importantrole in Type IIn supernovae (SNe), analyses of the more common SNe IIP and IILhave not traditionally included interaction as a significant power source.However, recent campaigns to observe SNe within days of explosion have revealednarrow emission lines of high-ionization species in the earliest spectra ofluminous SNe II of all subclasses. These "flash ionization" features indicatethe presence of a confined shell of material around the progenitor star. Herewe present the first low-luminosity (LL) SN to show flash ionization features,SN 2016bkv. This SN peaked at $M_V = -16$ mag and has H{\alpha} expansionvelocities under 1350 km/s around maximum light, placing it at the faint/slowend of the distribution of SNe IIP (similar to SN 2005cs). The light-curveshape of SN 2016bkv is also extreme among SNe IIP. A very strong initial peakcould indicate additional luminosity from circumstellar interaction. A verysmall fall from the plateau to the nickel tail indicates unusually largeproduction of radioactive nickel compared to other LL SNe IIP. A comparisonbetween nebular spectra of SN 2016bkv and models raises the possibility that SN2016bkv is an electron-capture supernova.

Short-Lived Circumstellar Interaction in the Low-Luminosity Type IIP SN 2016bkv