SN 2018is: A low-luminosity Type IIP supernova with narrow hydrogen emission lines at early phases

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Table 4.

Best-fit core parameters for the true bolometric light curve of SN 2018is using Nagy et al. (2014) and Jäger et al. (2020) for the low reddening (LR) and high reddening (HR) scenarios.

Parameters	LR	HR	Remarks
R₀ (R_⊙)	637 $_{- 111}^{+ 363}$ $^{+363}_{-111}$	690 $_{- 149}^{+ 296}$ $^{+296}_{-149}$	Initial radius of ejecta
M_ej (M_⊙)	6.0 $_{- 1.0}^{+ 1.5}$ $^{+1.5}_{-1.0}$	8.2 $_{- 1.4}^{+ 1.8}$ $^{+1.8}_{-1.4}$	Ejecta mass
E_kin (foe)	0.27 $_{- 0.04}^{+ 0.06}$ $^{+0.06}_{-0.04}$	0.36 $_{- 0.06}^{+ 0.08}$ $^{+0.08}_{-0.06}$	Initial kinetic energy
E_th (foe)	0.03 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$	0.04 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$	Initial thermal energy
κ (cm²/g)	0.26 $_{- 0.08}^{+ 0.10}$ $^{+0.10}_{-0.08}$	0.14 $_{- 0.15}^{+ 0.06}$ $^{+0.06}_{-0.15}$	Thomson scattering opacity
M_Ni (10⁻³ M_⊙)	3.17 $_{- 0.01}^{+ 0.03}$ $^{+0.03}_{-0.01}$	4.71 $_{- 0.02}^{+ 0.03}$ $^{+0.03}_{-0.02}$	⁵⁶Ni mass

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