Peculiar, Low Luminosity Type II Supernovae: Low Energy Explosions in Massive Progenitors?
Abstract
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 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 under-energetic with respect to a typical Type II supernova 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.
Keywords
Cite
@article{arxiv.astro-ph/0210171,
title = {Peculiar, Low Luminosity Type II Supernovae: Low Energy Explosions in Massive Progenitors?},
author = {L. Zampieri and A. Pastorello and M. Turatto and E. Cappellaro and S. Benetti and G. Altavilla and P. Mazzali and M. Hamuy},
journal= {arXiv preprint arXiv:astro-ph/0210171},
year = {2009}
}
Comments
7 pages, 3 figures. MNRAS, in press