Photometric and spectroscopic evolution of the type IIP supernova SN 2004et

Abstract

We present optical photometry and spectroscopy of the type IIP supernova SN 2004et that occurred in the nearby galaxy NGC 6946. The observations span a time range of 8 days to 541 days after explosion. The late time bolometric luminosity and the H$\alpha$ luminosity in the nebular phase indicate that $0.06\pm 0.02M_{\odot }$ of ${}^{56}$Ni was synthesised during the explosion. The plateau luminosity, its duration and the expansion velocity of the supernova at the middle of the plateau indicate an explosion energy of $E_{\exp }=1.20_{-0.30}^{+0.38}\times 10^{51}$ ergs. The late time light curve and the evolution of the [OI] and H$\alpha$ emission line profiles indicate the possibility of an early dust formation in the supernova ejecta. The luminosity of [OI] 6300, 6364 Ådoublet, before the dust formation phase, is found to be comparable to that of SN 1987A at similar epochs, impling an oxygen mass in the range $1.5-2M_{\odot }$, and a main sequence mass of $20M_{\odot }$ for the progenitor.

26 pages, 11 figures, accepted for publication in MNRAS

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