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PTF13efv - An Outburst 500 Days Prior to the SNHUNT 275 Explosion and Its Radiative Efficiency

Ofek, EO and Cenko, SB and Shaviv, NJ and Duggan, G and Strotjohann, NL and Rubin, A and Kulkarni, SR and Gal-Yam, A and Sullivan, M and Cao, Y and Nugent, PE and Kasliwal, MM and Sollerman, J and Fransson, C and Filippenko, AV and Perley, DA and Yaron, O and Laher, R (2016) PTF13efv - An Outburst 500 Days Prior to the SNHUNT 275 Explosion and Its Radiative Efficiency. The Astrophysical Journal, 824 (1). ISSN 1538-4357

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Abstract

The American Astronomical Society. All rights reserved..The progenitors of some supernovae (SNe) exhibit outbursts with super-Eddington luminosities prior to their final explosions. This behavior is common among SNe IIn, but the driving mechanisms of these precursors are not yet well-understood. SNHunt 275 was announced as a possible new SN during 2015 May. Here we report on pre-explosion observations of the location of this event by the Palomar Transient Factory (PTF) and report the detection of a precursor about 500 days prior to the 2015 May activity (PTF 13efv). The observed velocities in the 2015 transient and its 2013 precursor absorption spectra are low (1000-2000 km s-1), so it is not clear yet if the recent activity indeed marks the final disruption of the progenitor. Regardless of the nature of this event, we use the PTF photometric and spectral observations, as well as Swift-UVOT observations, to constrain the efficiency of the radiated energy relative to the total kinetic energy of the precursor. We find that, using an order-of-magnitude estimate and under the assumption of spherical symmetry, the ratio of the radiated energy to the kinetic energy is in the range of 4 x 10-2 to 3.4 x 103. © 2016.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences, 0305 Organic Chemistry, 0306 Physical Chemistry (Incl. Structural)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
Date Deposited: 17 Feb 2017 12:16
Last Modified: 17 Feb 2017 12:16
DOI or Identification number: 10.3847/0004-637X/824/1/6
URI: http://researchonline.ljmu.ac.uk/id/eprint/5585

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