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

References in corpus (1)

• Towards a Cosmological Hubble Diagram for Type II-P Supernovae

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• A New Class of Luminous Transients and A First Census of Their Massive Stellar Progenitors
• SN 2008S: A Cool Super-Eddington Wind in a Supernova Impostor
• SN 2006bp: Probing the Shock Breakout of a Type II-P Supernova
• Bolometric Light Curves for 33 Type II-Plateau Supernovae
• Type IIP Supernova SN 2004et: A Multi-Wavelength Study in X-Ray, Optical and Radio
• An Extremely Bright Echo Associated With SN 2002hh
• Ejecta and progenitor of the low-luminosity Type IIP supernova 2003Z
• 8.4GHz VLBI observations of SN2004et in NGC6946
• Chandra Observations of SN 2004et and the X-ray Emission of Type IIp Supernovae