Massive stars exploding in a He-rich circumstellar medium - XI. Diverse evolution of five Ibn SNe 2020nxt, 2020taz, 2021bbv, 2023utc, and 2024aej

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Table 3.

Best-fit parameters for the RD+CSI model.

	SN 2020nxt	SN 2020taz	SN 2021bbv	SN 2023utc	SN 2024aej
Nickel fraction (f_Ni; %)	$0 . 037_{- 0.005}^{+ 0.004}$ $0.037_{-0.005}^{+0.004}$	$0 . 001_{- 0.000}^{+ 0.001}$ $0.001_{-0.000}^{+0.001}$	$0 . 16_{- 0.02}^{+ 0.02}$ $0.16_{-0.02}^{+0.02}$	$0 . 018_{- 0.002}^{+ 0.002}$ $0.018_{-0.002}^{+0.002}$	$0 . 14_{- 0.04}^{+ 0.03}$ $0.14_{-0.04}^{+0.03}$
Kinetic energy (E_kin; 10⁵¹ erg)	$0 . 40_{- 0.05}^{+ 0.06}$ $0.40_{-0.05}^{+0.06}$	$0 . 36_{- 0.05}^{+ 0.08}$ $0.36_{-0.05}^{+0.08}$	$0 . 61_{- 0.09}^{+ 0.08}$ $0.61_{-0.09}^{+0.08}$	$0 . 06_{- 0.01}^{+ 0.01}$ $0.06_{-0.01}^{+0.01}$	$0 . 91_{- 0.22}^{+ 0.24}$ $0.91_{-0.22}^{+0.24}$
CSM mass (M_CSM; M_⊙)	$0 . 18_{- 0.04}^{+ 0.04}$ $0.18_{-0.04}^{+0.04}$	$0 . 95_{- 0.18}^{+ 0.19}$ $0.95_{-0.18}^{+0.19}$	$0 . 21_{- 0.04}^{+ 0.05}$ $0.21_{-0.04}^{+0.05}$	$0 . 17_{- 0.04}^{+ 0.06}$ $0.17_{-0.04}^{+0.06}$	$0 . 25_{- 0.06}^{+ 0.13}$ $0.25_{-0.06}^{+0.13}$
Ejecta mass (M_ej; M_⊙)	$1 . 06_{- 0.04}^{+ 0.08}$ $1.06_{-0.04}^{+0.08}$	$3 . 03_{- 0.57}^{+ 0.71}$ $3.03_{-0.57}^{+0.71}$	$0 . 90_{- 0.09}^{+ 0.11}$ $0.90_{-0.09}^{+0.11}$	$0 . 85_{- 0.03}^{+ 0.07}$ $0.85_{-0.03}^{+0.07}$	$0 . 85_{- 0.17}^{+ 0.23}$ $0.85_{-0.17}^{+0.23}$
CSM inner radius (R₀; AU)	$9 . 3_{- 2.1}^{+ 2.6}$ $9.3_{-2.1}^{+2.6}$	$49 . 0_{- 9.85}^{+ 10.7}$ $49.0_{-9.85}^{+10.7}$	$24 . 2_{- 5.4}^{+ 6.0}$ $24.2_{-5.4}^{+6.0}$	$17 . 7_{- 3.9}^{+ 6.4}$ $17.7_{-3.9}^{+6.4}$	$34 . 6_{- 8.1}^{+ 17.6}$ $34.6_{-8.1}^{+17.6}$
CSM density (log₁₀ ρ_CSM; g cm⁻³)	$- 10 . 41_{- 0.39}^{+ 0.78}$ $-10.41_{-0.39}^{+0.78}$	$- 9 . 05_{- 0.35}^{+ 0.31}$ $-9.05_{-0.35}^{+0.31}$	$- 7 . 68_{- 1.08}^{+ 1.07}$ $-7.68_{-1.08}^{+1.07}$	$- 7 . 04_{- 0.94}^{+ 0.72}$ $-7.04_{-0.94}^{+0.72}$	$- 8 . 06_{- 0.82}^{+ 1.05}$ $-8.06_{-0.82}^{+1.05}$
Ejecta velocity ( $v_{ej} = \sqrt{2 \times E_{kin} / M_{ej}}$ $v_{\mathrm{ej}} = \sqrt{2\times E_{\mathrm{kin}} / M_{\mathrm{ej}}}$ ; km s⁻¹)	$6153_{- 404}^{+ 516}$ $6153_{-404}^{+516}$	$3481_{- 417}^{+ 554}$ $3481_{-417}^{+554}$	$8237_{- 732}^{+ 737}$ $8237_{-732}^{+737}$	$2728_{- 150}^{+ 198}$ $2728_{-150}^{+198}$	$13480_{- 764}^{+ 1023}$ $13480_{-764}^{+1023}$
Nickel mass (M_Ni = f_Ni × M_ej; M_⊙)	$0 . 04_{- 0.01}^{+ 0.01}$ $0.04_{-0.01}^{+0.01}$	$0 . 002_{- 0.001}^{+ 0.003}$ $0.002_{-0.001}^{+0.003}$	$0 . 15_{- 0.03}^{+ 0.04}$ $0.15_{-0.03}^{+0.04}$	$0 . 015_{- 0.002}^{+ 0.003}$ $0.015_{-0.002}^{+0.003}$	$0 . 12_{- 0.06}^{+ 0.06}$ $0.12_{-0.06}^{+0.06}$

Notes. Best-fit values of the six free parameters used in the hybrid RD+CSI model fitting to the multi-band light curves of the five SNe Ibn in our sample, along with two derived physical parameters. All results are obtained using the MOSFiT code. The hybrid RD+CSI model with a constant CSM density profile (s = 0) is adopted for all fits. Quoted uncertainties represent the 68% confidence intervals derived from the posterior distributions (see Appendix E for the corresponding corner plots), and do not include systematic uncertainties arising from the simplified nature of the model or potential limitations in the data.

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