Three-dimensional hydrodynamic simulations of supernova ejecta with a central energy source

Abstract

We present the results of three-dimensional special relativistic hydrodynamic simulations of supernova ejecta with a powerful central energy source. We assume spherical supernova ejecta freely expanding with the initial kinetic energy of $10^{51}$ erg. We performed two simulations with different total injected energies of $10^{51}$ and $10^{52}$ erg to see how the total injected energy affects the subsequent evolution of the supernova ejecta. When the injected energy well exceeds the initial kinetic energy of the supernova ejecta, the hot bubble produced by the additional energy injection overwhelms and penetrates the whole supernova ejecta, resulting in clumpy density structure. For the smaller injected energy, on the other hand, the energy deposition stops before the hot bubble breakout occurs, leaving the outer envelope well-stratified. This qualitative difference may indicate that central engine powered supernovae could be observed as two different populations, such as supernovae with and without broad-line spectral features, depending on the amount of the total injected energy with respect to the initial kinetic energy.

19 pages, 8 figures, accepted for publication in ApJ

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