A1 Refereed original research article in a scientific journal
LSQ14efd: observations of the cooling of a shock break-out event in a type Ic Supernova
Authors: Barbarino C, Botticella MT, Dall'Ora M, Della Valle M, Benetti S, Lyman JD, Smartt SJ, Arcavi I, Baltay C, Bersier D, Dennefeld M, Ellman N, Fraser M, Gal-Yam A, Hosseinzadeh G, Howell DA, Inserra C, Kankare E, Leloudas G, Maguire K, McCully C, Mitra A, McKinnon R, Olivares F, Pignata G, Rabinowitz D, Rostami S, Smith KW, Sullivan M, Valenti S, Yaron O, Young D
Publisher: OXFORD UNIV PRESS
Publication year: 2017
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 471
Issue: 2
First page : 2463
Last page: 2480
Number of pages: 18
ISSN: 0035-8711
DOI: https://doi.org/10.1093/mnras/stx1709
We present the photometric and spectroscopic evolution of the type Ic supernova LSQ14efd, discovered by the La SillaQUEST survey and followed by PESSTO. LSQ14efdwas discovered fewdays after explosion and the observations cover up to similar to 100 d. 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 +/- 0.5M(circle dot), a synthesized nickel mass of 0.25M(circle dot) and a kinetic energy of E-kin = 5.6 +/- 0.5 x 10(51) erg. No connection between LSQ14efd and a gamma-ray burst 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 breakout.
