OGLE-2013-SN-079: A LONELY SUPERNOVA CONSISTENT WITH A HELIUM SHELL DETONATION

Journal Article · Tue Jan 20 00:00:00 EST 2015 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/799/1/L2· OSTI ID:22364585

Inserra, C.; Sim, S. A.; Smartt, S. J.; Nicholl, M.; Jerkstrand, A.; Chen, T. -W. ^[1]; Wyrzykowski, L. ^[2]; Fraser, M.; Blagorodnova, N.; Campbell, H. ^[3]; Shen, K. J. ^[4]; Gal-Yam, A. ^[5]; Howell, D. A.; Valenti, S. ^[6]; Maguire, K. ^[7]; Mazzali, P.; Bersier, D. ^[8]; Taubenberger, S.; Benitez-Herrera, S. ^[9]; others, and

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1. Astrophysics Research Centre, School of Mathematics and Physics, Queens University Belfast, Belfast BT7 1NN (United Kingdom)
2. University of Warsaw, Astronomical Observatory, Al. Ujazdowskie 400-478 Warszawa (Poland)
3. Institute of Astronomy, University of Cambridge, Madingley Road, CB3 0HA Cambridge (United Kingdom)
4. Department of Astronomy and Theoretical Astrophysics Center, University of California, Berkeley, CA 94720 (United States)
5. Benoziyo Center for Astrophysics, Weizmann Institute of Science, 76100 Rehovot (Israel)
6. Las Cumbres Observatory Global Telescope Network, 6740 Cortona Drive, Suite 102 Goleta, CA 93117 (United States)
7. European Southern Observatory for Astronomical Research in the Southern Hemisphere (ESO), Karl-Schwarzschild-Str. 2, 85748 Garching b. Munchen (Germany)
8. Astrophysics Research Institute, Liverpool John Moores University, Liverpool (United Kingdom)
9. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85741 Garching (Germany)

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{sub I} ∼ –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.

• OSTI ID: 22364585
• Journal Information: Astrophysical Journal Letters, Vol. 799, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION SPECTROSCOPY
CARBON MONOXIDE
COLOR
HELIUM
INFRARED SPECTRA
LUMINOSITY
MASS
NOVAE
RED SHIFT
SUPERNOVAE
WHITE DWARF STARS