期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 372, 期 3, 页码 1315-1324出版社
OXFORD UNIV PRESS
DOI: 10.1111/j.1365-2966.2006.10937.x
关键词
supernovae : general; supernovae : individual : SN 2004et; galaxies : individual : NGC 6946
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 8-541 d after explosion. The late time bolometric luminosity and the Ha luminosity in the nebular phase indicate that 0.06 +/- 0.02 M-circle dot of Ni-56 was synthesized 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) x 10(51) erg. The late time light curve and the evolution of the [O I] and H alpha emission-line profiles indicate the possibility of an early dust formation in the supernova ejecta. The luminosity of [O I] 6300, 6364 angstrom doublet, before the dust formation phase, is found to be comparable to that of SN 1987A at similar epochs, implying an oxygen mass in the range 1.5-2M(circle dot), and a main-sequence mass of 20M(circle dot) for the progenitor.
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