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Calculated Late Time Spectra of Supemovae

Published online by Cambridge University Press:  12 April 2016

Timothy S. Axelrod
Timothy S. Axelrod*
Affiliation:
Lawrence Livermore National Laboratory Livermore, CaliforniaU.S.A. October, 1987

Extract

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We consider here the nebular phase spectra of supernovae whose late time luminosity is provided by the radioactive decay of 56Ni and 56Co synthesized in the explosion. A broad variety of supernovae are known or suspected to fall in this category. This includes all SNIa and SNIb, and at least some SNII, in particular SN1987a. At sufflciendy late times the expanding supernova becomes basically nebular in character due to its decreasing optical depth. The spectra produced during this stage contain information on the density and abundance structure of the entire supernova, as opposed to spectra near maximum light which are affected only by the outermost layers. A numerical model for nebular spectrum formation is therefore potentially very valuable for answering currently outstanding questions about the post-explosion supernova structure. As an example, we can hope to determine the degree of mixing which occurs between the layers of the “onion-skin” abundance structure predicted by current one dimensional explosion calculations.

Type
Part III. Chemical and Dynamical Structures of Exploding Stars
Information
International Astronomical Union Colloquium , Volume 108: Atmospherics Diagnostics of Stellar Evolution: Chemical Peculiarity, Mass Loss, and Explosion , 1988 , pp. 375 - 382
Copyright
Copyright © Springer-Verlag 1988

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