Fig. 4.

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LC models (left panel) and evolution of the radius at the contact discontinuity, as compared to the photospheric radius (right panel). The model parameters are as follows: Mej = 3M⊙, EK = 2.5 × 1051 ergs, s = 2.9, and D′ = 2.3 for SN 2019hgp (blue lines), and Mej = 4 M⊙, EK = 4 × 1051 ergs, s = 2.9, and D′ = 5.1 for SNe 2021ckj and 2021csp (red lines). Additionally, two scenarios for the initial decay seen in SN 2021csp are shown: (1) the SN-CSM interaction driven by a highly energetic component (magenta lines) and (2) the shock-cooling of an energetic component (solid cyan lines). As a comparison, the same is also shown, but for a canonical explosion energy (dashed-cyan line). The gray hatching shows the template of the LCs of Type Ibn SNe (Hosseinzadeh et al. 2017; Maeda & Moriya 2022).
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