Статья

Peculiar, low-luminosity Type II supernovae: low-energy explosions in massive progenitors?

L. ZampieriINAF — Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, ItalyA. PastorelloDepartment of Astronomy, University of Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, ItalyM. TurattoINAF — Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, ItalyE. CappellaroINAF — Astronomical Observatory of Capodimonte, Via Moiariello 16, I-80131 Napoli, ItalyS. BenettiINAF — Astronomical Observatory of Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, ItalyG. AltavillaDepartment of Astronomy, University of Padova, Vicolo dell'Osservatorio 2, I-35122 Padova, ItalyP. A. MazzaliINAF — Astronomical Observatory of Trieste, Via Tiepolo 11, I-34131 Trieste, ItalyM. HamuyThe Observatories of the Carnegie Institution of Washington, 813 Santa Barbara Street, Pasadena, CA 91101, USA

2003en

ABI

Аннотация

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 56Ni 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 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.

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Идентификаторы

DOI: 10.1046/j.1365-8711.2003.06082.x

Цитирования и источники

Цитирований: 2Использованных источников: 0

Показатели — AkademScholar