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LSQ14efd: observations of the cooling of a shock break-out event in a type Ic Supernova

Barbarino, C and Botticella, MT and Dall'Ora, M and Valle, MD and Benetti, S and Lyman, JD and Smartt, SJ and Arcavi, I and Baltay, C and Bersier, D and Dennefeld, M and Ellman, N and Fraser, M and Gal-Yam, A and Hosseinzadeh, G and Howell, DA and Inserra, C and Kankare, E and Leloudas, G and Maguire, K and McCully, C and Mitra, A and McKinnon, R and E, FO and Pignata, G and Rabinowitz, D and Rostami, S and Smith, KW and Sullivan, M and Valenti, S and Yaron, O and Young, D LSQ14efd: observations of the cooling of a shock break-out event in a type Ic Supernova. Monthly Notices of the Royal Astronomical Society. ISSN 0035-8711 (Accepted)

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Abstract

We present the photometric and spectroscopic evolution of the type Ic supernova LSQ14efd, discovered by the La Silla QUEST survey and followed by PESSTO. LSQ14efd was discovered few days after explosion and the observations cover up to ~100 days. The early photometric points show the signature of the cooling of the shock break-out event experienced by the progenitor at the time of the supernova explosion, one of the first for a type Ic supernova. A comparison with type Ic supernova spectra shows that LSQ14efd is quite similar to the type Ic SN 2004aw. These two supernovae have kinetic energies that are intermediate between standard Ic explosions and those which are the most energetic explosions known (e.g. SN 1998bw). We computed an analytical model for the light-curve peak and estimated the mass of the ejecta 6.3 +/- 0.5 Msun, a synthesized nickel mass of 0.25 Msun and a kinetic energy of Ekin = 5.6 +/- 0.5 x 10^51 erg. No connection between LSQ14efd and a GRB event could be established. However we point out that the supernova shows some spectroscopic similarities with the peculiar SN-Ia 1999ac and the SN-Iax SN 2008A. A core-collapse origin is most probable considering the spectroscopic, photometric evolution and the detection of the cooling of the shock break-out.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Published by Oxford University Press on behalf of the Royal Astronomical Society.
Uncontrolled Keywords: astro-ph.HE; astro-ph.HE; astro-ph.SR
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 21 Jul 2017 10:26
Last Modified: 21 Jul 2017 10:26
URI: http://researchonline.ljmu.ac.uk/id/eprint/6833

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