Fast evolving pair-instability supernova models: evolution, explosion, light curves
Abstract
With an increasing number of superluminous supernovae (SLSNe) discovered the question of their origin remains open and causes heated debates in the supernova community. Currently, there are three proposed mechanisms for SLSNe: (1) pair-instability supernovae (PISN), (2) magnetar-driven supernovae, and (3) models in which the supernova ejecta interacts with a circumstellar material ejected before the explosion. Based on current observations of SLSNe, the PISN origin has been disfavoured for a number of reasons. Many PISN models provide overly broad light curves and too reddened spectra, because of massive ejecta and a high amount of nickel. In the current study we re-examine PISN properties using progenitor models computed with the GENEC code. We calculate supernova explosions with FLASH and light curve evolution with the radiation hydrodynamics code STELLA. We find that high-mass models (200 and 250 solar masses) at relatively high metallicity (Z=0.001) do not retain hydrogen in the outer layers and produce relatively fast evolving PISNe Type I and might be suitable to explain some SLSNe. We also investigate uncertainties in light curve modelling due to codes, opacities, the nickel-bubble effect and progenitor structure and composition.
Cite
@article{arxiv.1610.01086,
title = {Fast evolving pair-instability supernova models: evolution, explosion, light curves},
author = {Alexandra Kozyreva and Matthew Gilmer and Raphael Hirschi and Carla Frohlich and Sergey Blinnikov and Ryan T. Wollaeger and Ulrich M. Noebauer and Daniel R. van Rossum and Alexander Heger and Wesley P. Even and Roni Waldman and Alexey Tolstov and Emmanouil Chatzopoulos and Elena Sorokina},
journal= {arXiv preprint arXiv:1610.01086},
year = {2016}
}
Comments
14 pages, 1 table, 19 figures. Accepted for publication in MNRAS