Optical Observations of the Young Type Ic Supernova SN 2014L in M99

Zhang, Jujia and Wang, Xiaofeng and Vinkó, József and Wheeler, J Craig and Chang, Liang (2018) Optical Observations of the Young Type Ic Supernova SN 2014L in M99. ASTROPHYSICAL JOURNAL, 863 (1). ISSN 1538-4357

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Abstract

We present optical spectroscopic and photometric observations of the nearby type Ic supernova (SN Ic) SN 2014L. This SN was discovered by the Tsinghua-NAOC Transient Survey (TNTS) in the nearby type-Sc spiral galaxy M99 (NGC 4254). Fitting to the early-time light curve indicates that SN 2014L was detected at only a few hours after the shock breakout, and it reached a peak brightness of M <SUB>V</SUB> = ‑17.73 ± 0.28 mag (L = [2.06 ± 0.50] ×10<SUP>42</SUP> erg s<SUP>‑1</SUP>) approximately 13 days later. SN 2014L shows a close resemblance to SN 2007gr in the photometric evolution, while it shows stronger absorption features of intermediate-mass elements (especially Ca II) in the early-time spectra. Based on simple modeling of the observed light curves, we derived the mass of synthesized <SUP>56</SUP>Ni as M <SUB>Ni</SUB> = 0.075 ± 0.025 M <SUB>⊙</SUB>, and the mass and total energy of the ejecta as M <SUB>ej</SUB> = 1.00 ± 0.20M <SUB>⊙</SUB> and E <SUB>ej</SUB> = 1.45 ±0.25 foe, respectively. Given these typical explosion parameters, the early detection, and the extensive observations, we suggest that SN 2014L could be a template sample for the investigation of SNe Ic.

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