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Fig. 5


Top: emergent luminosity in the Hα region and multiple epochs for model DDC15 with Mst of 0.0018, 0.017, and 0.18 M from left to right. The color coding indicates epochs 100, 150, 200, 250, and 300 d after explosion (time increases from the upper curve to the lower curve; see also left panel of Fig. 2). Bottom: same as top, but we now subtract the luminosity arising from the model with Mst = 10−5 M, which has the effect of erasing the luminosity contribution from the metal-rich, SN Ia ejecta. The stripped material contributes not just through Hα emission, but also weak emission from other lines (e.g., Fe II) and some weak background continuum.

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