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DISCOVERY AND EARLY MULTI-WAVELENGTH MEASUREMENTS OF THE ENERGETIC TYPE IC SUPERNOVA PTF12GZK: A MASSIVE-STAR EXPLOSION IN A DWARF HOST GALAXY

Ben-Ami, S and Gal-Yam, A and Filippenko, AV and Mazzali, PA and Modjaz, M and Yaron, O and Arcavi, I and Cenko, SB and Horesh, A and Howell, DA and Graham, ML and Horst, JC and Im, M and Jeon, Y and Kulkarni, SR and Leonard, DC and Perley, D and Pian, E and Sand, DJ and Sullivan, M and Becker, JC and Bersier, D and Bloom, JS and Bottom, M and Brown, PJ and Clubb, KI and Dilday, B and Dixon, RC and Fortinsky, AL and Fox, DB and Gonzalez, LA and Harutyunyan, A and Kasliwal, MM and Li, W and Malkan, MA and Manulis, I and Matheson, T and Moskovitz, NA and Muirhead, PS and Nugent, PE and Ofek, EO and Quimby, RM and Richards, JW and Ross, NR and Searcy, KJ and Silverman, JM and Smith, N and Vanderburg, A and Walker, ES (2012) DISCOVERY AND EARLY MULTI-WAVELENGTH MEASUREMENTS OF THE ENERGETIC TYPE IC SUPERNOVA PTF12GZK: A MASSIVE-STAR EXPLOSION IN A DWARF HOST GALAXY. ASTROPHYSICAL JOURNAL LETTERS, 760 (2). ISSN 2041-8205

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Abstract

We present the discovery and extensive early-time observations of the Type Ic supernova (SN) PTF12gzk. Our light curves show a rise of 0.8 mag within 2.5 hr. Power-law fits (f(t)∝(t – t 0) n ) to these data constrain the explosion date to within one day. We cannot rule out a quadratic fireball model, but higher values of n are possible as well for larger areas in the fit parameter space. Our bolometric light curve and a dense spectral sequence are used to estimate the physical parameters of the exploding star and of the explosion. We show that the photometric evolution of PTF12gzk is slower than that of most SNe Ic. The high ejecta expansion velocities we measure (~30, 000 km s–1 derived from line minima four days after explosion) are similar to the observed velocities of broad-lined SNe Ic associated with gamma-ray bursts (GRBs) rather than to normal SN Ic velocities. Yet, this SN does not show the persistent broad lines that are typical of broad-lined SNe Ic. The host-galaxy characteristics are also consistent with GRB-SN hosts, and not with normal SN Ic hosts. By comparison with the spectroscopically similar SN 2004aw, we suggest that the observed properties of PTF12gzk indicate an initial progenitor mass of 25-35 M ☉ and a large ((5-10) × 1051 erg) kinetic energy, the later being close to the regime of GRB-SN properties.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: IOP PUBLISHING LTD
Related URLs:
Date Deposited: 08 Feb 2016 10:55
Last Modified: 08 Feb 2016 10:55
DOI or Identification number: 10.1088/2041-8205/760/2/L33
URI: http://researchonline.ljmu.ac.uk/id/eprint/2856

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