Title:	Type IIP supernova SN 2004et: a multiwavelength study in X-ray, optical and radio
Authors:	Misra, Kuntal Pooley, Dave Chandra, Poonam Bhattacharya, D. Ray, Alak K. Sagar, R. Lewin, Walter H.G.
Keywords:	Techniques: photometric Supernovae: general Supernova: individual SN 2004et
Issue Date:	Oct-2007
Publisher:	Blackwell Publishing for the Royal Astronomical Society
Citation:	Monthly Notices of the Royal Astronomical Society, 2007, Vol.381, p280-292.
Abstract:	We present X-ray, broad-band optical and low-frequency radio observations of the bright type IIP supernova SN 2004et. The Chandra X-ray Observatory observed the supernova at three epochs, and the optical coverage spans a period of ~470 d since explosion. The X-ray emission softens with time, and we characterize the X-ray luminosity evolution as LX ~ t-0.4. We use the observed X-ray luminosity to estimate a mass-loss rate for the progenitor star of ~2 × 10-6Msolaryr-1. The optical light curve shows a pronounced plateau lasting for about 110 d. Temporal evolution of photospheric radius and colour temperature during the plateau phase is determined by making blackbody fits. We estimate the ejected mass of 56Ni to be 0.06 +/- 0.03Msolar. Using the expressions of Litvinova & Nadëzhin we estimate an explosion energy of (0.98 +/- 0.25) × 1051 erg. We also present a single epoch radio observation of SN 2004et. We compare this with the predictions of the model proposed by Chevalier, Fransson & Nymark. These multiwavelength studies suggest a main-sequence progenitor mass of ~20 Msolar for SN 2004et.
Description:	Restricted Access. An open-access version is available at arXiv.org (one of the alternative locations)
URI:	http://hdl.handle.net/2289/3351
ISSN:	E-ISSN(s): 1365-2966 P-ISSN(s): 0035-8711
Alternative Location:	http://arxiv.org/abs/arXiv:0707.3485 http://adsabs.harvard.edu/abs/2007MNRAS.381..280M http://dx.doi.org/10.1111/j.1365-2966.2007.12258.x
Copyright:	2007 The Authors. Journal compilation © 2007 Royal Astronomical Society
Appears in Collections:	Research Papers (A&A)

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