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Fig. 9


Spectral synthesis model (in black) from Mazzali et al. (2016) applied for LSQ14mo spectra. Each spectrum is labelled with its rest-frame time from the r-band light curve maximum. The −7.0 d spectrum is dominated by O and C, other intermediate-mass elements also shown and labelled. The −2.2 d spectrum is similar to −7.0 d in terms of element identification, temperature, luminosity and velocity. The + 8.8 d spectrum, with a poor model fitting, shows a hot continuum but rather cool lines. This implies an additional luminosity may come from the SN ejecta interacting with a H- and He-poor shell. The + 15.2 d spectrum is similar to + 21.7 d and the strongest features are intermediate elements such asSi ii ,Fe ii ,Mg iiandCa ii . All identified lines are labelled.

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