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Fig. 21.

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Evolution of the [O II] λλ 7320,7330 + [Ca II] λλ 7291,7324 line complex. Left: Up to tmax+565.0 days, the line complex is dominated by [O II]. The red wing narrows due to an increasing occultation of the CSM shell by the optically thick expanding SN photosphere. Right: Between tmax+565.0 days and tmax+637.2 days, the line complex shifts to the blue, consistent with the [Ca II] line becoming more dominant. All profiles are centred on [O II] λ 7320.

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