OGLE-2013-SN-079: A Lonely Supernova Consistent with a Helium Shell Detonation

C. Inserra, S. A. Sim, L. Wyrzykowski, S. J. Smartt, M. Fraser, M. Nicholl, K. J. Shen, A. Jerkstrand, Avishay 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-RosaW. Hillebrandt, Z. Kostrzewa-Rutkowska, S. Kozllowski, M. Kromer, J. D. Lyman, J. Polshaw, F. K. Roepke, A. J. Ruiter, K. Smith, S. Spiro, M. Sullivan, Ofer Yaron, D. Young, F. Yuan

Research output: Contribution to journalArticlepeer-review


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 M-1 similar to -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.
Original languageEnglish
Article numberL2
Number of pages7
JournalAstrophysical Journal Letters
Issue number1
StatePublished - 20 Jan 2015


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