Fig. 7.
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Spectrum of SN 2023ixf at 277 d compared with that of Type II-pec SN 1987A at 283 d. SN 2023ixf shows a sharp rise at 2.29 μm due to the CO R branch’s υ = 2 − 0 R branch and additional emission extending at least to 2.45 μm, due to lines of both the CO R and P branches. In contrast, SN 1987A shows structures near 2.30 μm and 2.33 μm due to the CO 2 − 0 and 3 − 1 band heads with extended emission at longer wavelength due to lines from both the CO R and P branches.
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