Supersolar Ni/Fe production in the Type IIP SN 2012ec

A. Jerkstrand*, S. J. Smartt, J. Sollerman, C. Inserra, M. Fraser, J. Spyromilio, C. Fransson, T. -W. Chen, C. Barbarino, M. Dall'Ora, M. T. Botticella, M. Della Valle, A. Gal-Yam, S. Valenti, K. Maguire, P. Mazzali, L. Tomasella

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)

Abstract

SN 2012ec is a Type IIP supernova (SN) with a progenitor detection and comprehensive photospheric phase observational coverage. Here, we present Very Large Telescope and Public ESO Spectroscopic Survey of Transient Objects observations of this SN in the nebular phase. We model the nebular [O I] lambda lambda 6300, 6364 lines and find their strength to suggest a progenitor main-sequence mass of 13-15 M-circle dot. SN2012ec is unique among hydrogen-rich SNe in showing a distinct line of stable nickel [Ni II] lambda 7378. This line is produced by Ni-58, a nuclear burning ash whose abundance is a sensitive tracer of explosive burning conditions. Using spectral synthesis modelling, we use the relative strengths of [Ni II] lambda 7378 and [Fe II] lambda 7155 (the progenitor of which is Ni-56) to derive a Ni/Fe production ratio of 0.20 +/- 0.07 (by mass), which is a factor 3.4 +/- 1.2 times the solar value. High production of stable nickel is confirmed by a strong [Ni II] 1.939 mu m line. This is the third reported case of a core-collapse SN producing a Ni/Fe ratio far above the solar value, which has implications for core-collapse explosion theory and galactic chemical evolution models.

Original languageEnglish
Pages (from-to)2482-2494
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Volume448
Issue number3
Early online date04 Mar 2015
DOIs
Publication statusPublished - 11 Apr 2015

Bibliographical note

Published version

Keywords

  • line: formation
  • nuclear reactions, nucleosynthesis, abundances
  • stars: evolution
  • supernovae: general
  • supernovae: individual: SN 2012ec
  • SUPERNOVA EXPLOSIONS
  • SPECTROSCOPIC EVOLUTION
  • PLATEAU SUPERNOVAE
  • PROGENITOR MASS
  • EMISSION-LINES
  • STAR-FORMATION
  • P SUPERNOVAE
  • CRAB-NEBULA
  • NUCLEOSYNTHESIS
  • SN-1987A

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