Fig. 8.

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Optical spectra of J234402. The data are from our follow-up campaign with Baade (Magellan), VLT, and SALT. The spectra show a blue continuum as well as strong broad and narrow emission lines. The broad lines show a distinct asymmetry, with a blue wing. The spectra have been scaled using the P6 photometry and are presented here with a flux offset for clarity. Several important emission lines are marked with dashed lines. Spectral regions affected by telluric absorption have been indicated by grey bands. The inset shows a close-up of Hβ for the two spectra separated by the largest time span (17 days), as well as the difference between the spectra. The fitted host+continuum components have been subtracted from the spectra in the inset and they were normalised using the [OIII]λ5007 line fluxes. Over the period of follow-up presented here, the object shows no significant spectral evolution.
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