Left: bolometric light curves computed with CMFGEN for the explosion models based on He-star models he4 to he12. All nine models have the same ⁵⁶Ni mass of 0.08 M_⊙ and the same ejecta kinetic energy per unit mass of 5 × 10⁵⁰ erg . Right: bolometric light curves for model he12 and variants that include power from the compact remnant (he12pml and he12pmu), a higher kinetic energy (he12epl), a higher kinetic energy and higher ⁵⁶Ni mass (he12ep), and both combined (he12eppml). Details on these ejecta model parameters are given in Table 2. In both panels, the dashed line gives the instantaneous decay power emitted by an initial ⁵⁶Ni mass of 0.08 M_⊙.