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Pair-instability Supernova Simulations: Progenitor Evolution, Explosion, and Light Curves

Hirschi, Raphael

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Abstract

In recent years, the viability of the pair-instability supernova (PISN) scenario for explaining superluminous supernovae has all but disappeared except for a few slowly-evolving examples. However, PISNe are not predicted to be superluminous throughout the bulk of their mass range. In fact, it is more likely that the first PISN we see (if we have not seen one already) will not be superluminous. Here, we present hydrodynamic simulations of PISNe for four stellar models with unique envelope properties spanning the PISN mass range. In addition, we compute synthetic light curves (LCs) for comparison with current and future observations. We also investigate, in the context of our most massive model, the prospect of mixing in the supernova ejecta, alleviating discrepancies between current PISN models and the remaining superluminous candidate events. To this end, we present the first published 3D hydrodynamic simulations of PISNe. After achieving convergence between 1D, 2D, and 3D simulations, we examine mixing in the supernova ejecta and its affect on the bolometric LC. We observe slight deviations from spherical symmetry, which increase with the number of dimensions. We find no significant effects on the bolometric LC; however, we conclude that mixing between the silicon and oxygen rich layers caused by the Rayleigh–Taylor instability may affect spectra.

Citation

Hirschi, R. (2017). Pair-instability Supernova Simulations: Progenitor Evolution, Explosion, and Light Curves. Astrophysical Journal, 100 - 100. https://doi.org/10.3847/1538-4357/aa8461

Acceptance Date Aug 4, 2017
Publication Date Sep 6, 2017
Journal Astrophysical Journal
Print ISSN 0004-637X
Publisher American Astronomical Society
Pages 100 - 100
DOI https://doi.org/10.3847/1538-4357/aa8461
Keywords hydrodynamics, radiative transfer, stars, evolution, interiors, massive, supernovae, general
Publisher URL https://doi.org/10.3847/1538-4357/aa8461

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