Pulsational Pair-Instability Model for Superluminous Supernova PTF12dam: Interaction and Radioactive Decay
arXiv:1612.01634 · doi:10.3847/1538-4357/835/2/266
Abstract
Being a superluminous supernova (SLSN), PTF12dam can be explained by a Ni-powered model, a magnetar-powered model or an interaction model. We propose that PTF12dam is a pulsational pair instability supernova, where the outer envelope of a progenitor is ejected during the pulsations. Thus, it is powered by double energy source: radioactive decay of Ni and a radiative shock in a dense circumstellar medium. To describe multicolor light curves and spectra we use radiation hydrodynamics calculations of STELLA code. We found that light curves are well described in the model with 40M ejecta and 20-40M circumstellar medium. The ejected Ni mass is about 6M which results from explosive nucleosynthesis with large explosion energy (2-3)10 ergs. In comparison with alternative scenarios of pair-instability supernova and magnetar-powered supernova, in interaction model all the observed main photometric characteristics are well reproduced: multicolor light curves, color temperatures, and photospheric velocities.
11 pages, 17 figures, accepted for publication in the Astrophysical Journal on 28 Dec 2016
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