Radiative properties of pair-instability Supernova explosions

Luc Dessart*, Roni Waldman, Eli Livne, D. John Hillier, Stéphane Blondin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

We present non-local thermodynamic equilibrium time-dependent radiative transfer simulations of pair-instability supernovae (PISNe) stemming from red-supergiant (RSG), bluesupergiant andWolf-Rayet star rotation-free progenitors born in the mass range 160-230M⊙, at 10-4 Z⊙. Although subject to uncertainties in convection and stellar mass-loss rates, our initial conditions come from physically-consistent models that treat evolution from the main sequence, the onset of the pair-production instability, and the explosion phase. With our set of input models characterized by large 56Ni and ejecta masses, and large kinetic energies, we recover qualitatively the Type II-Plateau, II-peculiar and Ib/c light-curve morphologies, although they have larger peak bolometric luminosities (~109 to 1010 L⊙) and a longer duration (~200 d). We discuss the spectral properties for each model during the photospheric and nebular phases, including Balmer lines in II-P and II-pec at early times, the dominance of lines from intermediate-mass elements near the bolometric maximum, and the strengthening of metal line blanketing thereafter. Having similar He-core properties, all models exhibit similar post-peak spectra that are strongly blanketed by Fe II and Fe I lines, characterized by red colours, and that arise from photospheres/ejecta with a temperature of ⊙4000 K. Combined with the modest linewidths after the bolometric peak, these properties contrast with those of known superluminous SNe, suggesting that PISNe are yet to be discovered. Being reddish, PISNe will be difficult to observe at high redshift except when they stem from RSG explosions, in which case they could be used as metallicity probes and distance indicators.

Original languageEnglish
Pages (from-to)3227-3251
Number of pages25
JournalMonthly Notices of the Royal Astronomical Society
Volume428
Issue number4
DOIs
StatePublished - 1 Feb 2013

Keywords

  • Hydrodynamics
  • Stars: atmospheres
  • Stars: evolution
  • Supernovae: individual: 2006gy
  • Supernovae: individual: 2007bi

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