Pulsational Pair-instability Model for Superluminous Supernova PTF12dam: Interaction and Radioactive Decay

Alexey Tolstov, Ken'Ichi Nomoto, Sergei Blinnikov, Elena Sorokina, Robert Quimby, Petr Baklanov

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)

Abstract

Being a superluminous supernova, PTF12dam can be explained by a 56Ni-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 a double energy source: radioactive decay of 56Ni and a radiative shock in a dense circumstellar medium. To describe multicolor light curves and spectra, we use radiation-hydrodynamics calculations of the STELLA code. We found that light curves are well described in the model with 40 Mo ejecta and 20-40 Mo circumstellar medium. The ejected 56Ni mass is about 6 Mo, which results from explosive nucleosynthesis with large explosion energy (2-3) × 1052 erg. In comparison with alternative scenarios of pair-instability supernova and magnetar-powered supernova, in the interaction model, all the observed main photometric characteristics are well reproduced: multicolor light curves, color temperatures, and photospheric velocities.

Original languageEnglish
Article number266
Number of pages11
JournalAstrophysical Journal
Volume835
Issue number2
DOIs
Publication statusPublished - 1 Feb 2017

Keywords

  • circumstellar matter
  • supernovae: general
  • supernovae: individual (PTF12dam)
  • 2007BI
  • ANALYTIC FITS
  • LIGHT CURVES
  • RADIATION
  • PHOTOIONIZATION CROSS-SECTIONS
  • HYDROGEN
  • EXPLOSIONS
  • EVOLUTION
  • LUMINOUS SUPERNOVAE
  • STARS

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