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Three Dimensional Hydrodynamical Simulation of Type II Supernova

Published online by Cambridge University Press:  14 August 2015

Mikio Nagasawa
Mikio Nagasawa*
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181, Japan

Abstract

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Adiabatic supernova explosions of polytropic stars are investigated by a three dimensional Smoothed Particle Hydrodynamics. The evolution of thermal point explosions is almost spherically symmetric in a global sense, but they are found to be unstable against Rayleigh-Taylor instabilities. The typical unstable wavelength, which grows in the nonlinear stage, is comparable to the thickness of the spherical shell. As a result, we find a porous density structure on the expanding shell. These results suggest the dumpiness of the ejecta of supernova explosions. The accompanying mixing motion in the expanding shell can explain the rapidly rising light curve of SN1987A. Because it may mix up the energy source 56Ni towards the outer layers of supernovae.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 8: Highlights of Astronomy. As presented at the XXth General Assembly of the IAU, 1988 , 1989 , pp. 213 - 214
Copyright
Copyright © Kluwer 1989

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