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Discovery and Observations of the Unusually Luminous Type-Defying II-P/II-L Supernova ASASSN-13co

Holoien T. W.-S., Prieto J. L., Pejcha O., Stanek Z., Kochanek C. S., Shappee B. J., Grupe D., Morrell N., Thorstensen J. R., Basu U., Beacom J. F., Bersier D., Brimacombe J., Davis A. B., Pojmański G., Skowron D. M.

Acta Astronomica

2016

Vol. 66, No. 2

219--238

We present photometric and spectroscopic observations of ASASSN-13co, an unusually luminous Type II supernova and the first core-collapse supernova discovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). First detection of the supernova was on UT 2013 August 29 and the data presented span roughly 3.5 months after discovery. We use the recently developed model by Pejcha and Prieto to model the multi-band light curves of ASASSN-13co and derive the bolometric luminosity curve. We compare ASASSN-13co to other Type II supernovae to show that it was unusually luminous for a Type II supernova and that it exhibited an atypical light curve shape that does not cleanly match that of either a standard Type II-L or Type II-P supernova.