Top: spectral evolution of LSQ14mo taken by NTT+EFOSC2 of the PESSTO program. Blackbody curve fits (grey) show that the temperature before maximum light is ≈13 000–15 000 K and cooling rapidly to ~7000 K by 20 days after peak. The inset shows theMg ii absorption features from the host ISM taken at −2.2d. Bottom: comparison with other SLSN spectra. The prominent lines and their profiles are virtually identical to other SLSNe.
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