ASASSN-13dn Vgriz light curves

It was discovered near maximum light, reaching an absolute magnitude of Mv~-19mag, placing this object between normal luminosity type II SNe and superluminous SNe. A detailed analysis of the photometric and spectroscopic data of ASASSN-13dn is performed.

The spectra are characterized by broad lines, in particular the H{alpha} lines where we measure expansion velocities ranging between 14000-6000km/s over the first 100 days. H{alpha} dominates the nebular spectra, and we detect a narrow P-Cygni absorption within the broader emission line with an expansion velocity of 1100km/s. Photometrically, its light curve shows a re-brightening of ~0.6mag in the gri bands starting at 25+/-2 days after discovery, with a secondary peak at ~73d, followed by an abrupt and nearly linear decay of 0.09mag/d for the next 35 days.