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Fig. 13.

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Evolution of the ejecta radius assuming a 550 km s−1 bulk expansion velocity for a pre-outburst of SN 2011ht (dotted green line) from the onset at the first epoch of detections (square green symbols; Fraser et al. 2013; Ofek et al. 2014) compared to the estimated RBB and Rphot evolution of the event (round closed and open green symbols, respectively) based on spectra of the event (Humphreys et al. 2012). Similarly for SN 2020pvb (in orange) based on the data by Elias-Rosa et al. (2024) assuming a velocity of 800 km s−1.

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