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

Inserra, C., Sim, S. A., Wyrzykowski, L., Smartt, S. J., Fraser, M., Nicholl, M., Shen, K. J., Jerkstrand, A., Gal-Yam, A., Howell, D. A., Maguire, K., Mazzali, P., Valenti, S., Taubenberger, S., Benitez-Herrera, S., Bersier, D., Blagorodnova, N., Campbell, H., Chen, T.-W., Elias-Rosa, N., Hillebrandt, W., Kostrzewa-Rutkowska, Z., Koz?owski, S., Kromer, M., Lyman, J. D., Polshaw, J., Röpke, F. K., Ruiter, A. J., Smith, K., Spiro, S., Sullivan, M., Yaron, O., Young, D. and Yuan, F. 2015. OGLE-2013-SN-079: A lonely supernova consistent with a helium shell detonation. Astrophysical Journal Letters 799 (1) , L2. 10.1088/2041-8205/799/1/L2

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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.

Item Type: Article
Date Type: Published Online
Status: Published
Schools: Physics and Astronomy
Publisher: American Astronomical Society
ISSN: 2041-8205
Date of First Compliant Deposit: 2 January 2019
Date of Acceptance: 15 December 2014
Last Modified: 15 Mar 2019 15:49
URI: http://orca.cf.ac.uk/id/eprint/117975

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