Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 338, Issue 3, Pages 711-716Publisher
OXFORD UNIV PRESS
DOI: 10.1046/j.1365-8711.2003.06082.x
Keywords
methods : analytical; supernovae : general; supernovae : individual : SN 1997D; supernovae : individual : SN 1999br
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A number of supernovae, classified as Type II, show remarkably peculiar properties such as an extremely low expansion velocity and an extraordinarily small amount of Ni-56 in the ejecta. We present a joint analysis of the available observations for two of these peculiar Type II supernovae. SN 1997D and SN 1999br, using a comprehensive semi-analytic method that can reproduce the light curve and the evolution of the line velocity and continuum temperature. We find that these events are underenergetic with respect to a typical Type II super-nova and that the inferred mass of the ejecta is relatively large. We discuss the possibility that these supernovae originate from the explosion of a massive progenitor in which the rate of early infall of stellar material on the collapsed core is large. Events of this type could form a black hole remnant, giving rise to significant fallback and late-time accretion.
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