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Fig. 7.

image

High signal-to-noise spectrum of SN 2020bqj obtained with Keck at +47 days after estimated explosion epoch, with all emission lines discussed in the text identified. Also shown is a TNG/DOLORES spectrum of the peculiar SN 2011hw obtained +42 days after estimated explosion epoch (Pastorello et al. 2015b). SN 2011hw is a SN Ibn with a photometric and spectroscopic evolution that is very similar to SN 2020bqj, albeit somewhat faster. For example, the Ca II triplet is already visible in SN 2011hw, while in SN 2020bqj this feature only shows up from +71 days onwards (Fig. 3).

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