SN 2013ej light curves 1 to 450d after explosion

We present optical and near-infrared photometric and spectroscopic observations of SN 2013ej, in galaxy M74, from 1 to 450 d after the explosion. SN 2013ej is a hydrogen-rich supernova, classified as a Type IIL due to its relatively fast decline following the initial peak. It has a relatively high peak luminosity (absolute magnitude M_V_=-17.6) but a small ^56^Ni production of ~0.023M_{sun}. Its photospheric evolution is similar to other Type II SNe, with shallow absorption in the H{alpha} profile typical for a Type IIL. During transition to the radioactive decay tail at ~100d, we find the SN to grow bluer in B-V colour, in contrast to some other Type II supernovae. At late times, the bolometric light curve declined faster than expected from ^56^Co decay and we observed unusually broad and asymmetric nebular emission lines. Based on comparison of nebular emission lines most sensitive to the progenitor core mass, we find our observations are best matched to synthesized spectral models with a M_ZAMS=12-15 M_{sun}_ progenitor. The derived mass range is similar to but not higher than the mass estimated for Type IIP progenitors. This is against the idea that Type IIL are from more massive stars. Observations are consistent with the SN having a progenitor with a relatively low-mass envelope.

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Creator Yuan F.; Jerkstrand A.; Valenti S.; Sollerman J.; Seitenzahl I.R.; Pastorello A.; Schulze S.; Chen T.-W.; Childress M.J.; Fraser M.; Fremling C.; Kotak R.; Ruiter A.J.; Schmidt B.P.; Smartt S.J.; Taddia F.; Terreran G.; Tucker B.E.; Barbarino C.; Benetti S.; Elias-Rosa N.; Gal-Yam A.; Howell D.A.; Inserra C.; Kankare E.; Lee M.Y.; Li K.L.; Maguire K.; Margheim S.; Mehner A.; Ochner P.; Sullivan M.; Tomasella L.; Young D.R.
Publisher CDS
Publication Year 2018
OpenAccess true
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Discipline Astrophysics and Astronomy; Natural Sciences; Observational Astronomy; Physics; Stellar Astronomy