OGLE-2013-SN-079: a lonely supernova consistent with a helium shell detonation

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Authors

  • C. Inserra
  • S. A. Sim
  • L. Wyrzykowski
  • S. J. Smartt
  • M. Fraser
  • K. J. Shen
  • A. Jerkstrand
  • A. Gal-Yam
  • D. A. Howell
  • K. Maguire
  • P. Mazzali
  • S. Valenti
  • S. Taubenberger
  • S. Benitez-Herrera
  • D. Bersier
  • N. Blagorodnova
  • H. Campbell
  • T. -W. Chen
  • N. Elias-Rosa
  • W. Hillebrandt
  • Z. Kostrzewa-Rutkowska
  • S. Kozłowski
  • M. Kromer
  • J. D. Lyman
  • J. Polshaw
  • F. K. Röpke
  • A. J. Ruiter
  • K. Smith
  • S. Spiro
  • M. Sullivan
  • O. Yaron
  • D. Young
  • F. Yuan

Colleges, School and Institutes

Abstract

We present observational data for a peculiar supernova discovered by the OGLE-IV survey and followed by the Public ESO Spectroscopic Survey for Transient Objects. The inferred redshift of z = 0.07 implies an absolute magnitude in the rest-frame I-band of MI ~ –17.6 mag. This places it in the luminosity range between normal Type Ia SNe and novae. Optical and near infrared spectroscopy reveal mostly Ti and Ca lines, and an unusually red color arising from strong depression of flux at rest wavelengths <5000 Å. To date, this is the only reported SN showing Ti-dominated spectra. The data are broadly consistent with existing models for the pure detonation of a helium shell around a low-mass CO white dwarf and "double-detonation" models that include a secondary detonation of a CO core following a primary detonation in an overlying helium shell.

Details

Original languageEnglish
Article numberL2
Number of pages7
JournalAstrophysical Journal Letters
Volume799
Issue number1
Publication statusPublished - 9 Jan 2015

Keywords

  • supernovae: general, supernovae: individual: OGLE-2013-SN-079, surveys, white dwarfs, Astrophysics - Solar and Stellar Astrophysics