Massive stars exploding in a He-rich circumstellar medium - XII. SN 2024acyl: A fast, linearly declining Type Ibn supernova with early flash-ionisation features

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Volume 707 (March 2026)

A&A, 707 (2026) A157

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Table B.1.

MOSFiT multi-band light-curve fitting results of SN 2024acyl with RD+CSI model. The parameters are converted to linear space.

Parameters	Unit	Prior	Posterior (n = 10)	Posterior (n = 12)
Shell-like CSM (s = 0)

f_Ni	–	log 𝒰 (10⁻³, 0.1)	$0 . 036_{- 0.007}^{+ 0.010}$ $Mathematical equation: $ 0.036_{-0.007}^{+0.010} $$	$0 . 063_{- 0.016}^{+ 0.020}$ $Mathematical equation: $ 0.063_{-0.016}^{+0.020} $$
E_k	10⁵¹ erg	log 𝒰 (0.01, 1.0)	$0 . 06_{- 0.01}^{+ 0.01}$ $Mathematical equation: $ 0.06_{-0.01}^{+0.01} $$	$0 . 04_{- 0.01}^{+ 0.01}$ $Mathematical equation: $ 0.04_{-0.01}^{+0.01} $$
M_CSM	M_⊙	log 𝒰 (0.05, 0.8)	$0 . 51_{- 0.04}^{+ 0.05}$ $Mathematical equation: $ 0.51_{-0.04}^{+0.05} $$	$0 . 52_{- 0.03}^{+ 0.06}$ $Mathematical equation: $ 0.52_{-0.03}^{+0.06} $$
M_ej	M_⊙	log 𝒰 (0.1, 10.0)	$0 . 49_{- 0.09}^{+ 0.11}$ $Mathematical equation: $ 0.49_{-0.09}^{+0.11} $$	$0 . 29_{- 0.06}^{+ 0.10}$ $Mathematical equation: $ 0.29_{-0.06}^{+0.10} $$
R₀	AU	log 𝒰 (10, 30)	$17 . 8_{- 3.0}^{+ 3.6}$ $Mathematical equation: $ 17.8_{-3.0}^{+3.6} $$	$19 . 5_{- 3.7}^{+ 3.9}$ $Mathematical equation: $ 19.5_{-3.7}^{+3.9} $$
ρ	g cm⁻³	log 𝒰 (1 × 10⁻¹⁴, 8 × 10⁻⁹)	$8 . 3_{- 1.2}^{+ 2.7} \times 10^{- 12}$ $Mathematical equation: $ 8.3_{-1.2}^{+2.7}\times 10^{-12} $$	$8 . 9_{- 1.5}^{+ 1.8} \times 10^{- 12}$ $Mathematical equation: $ 8.9_{-1.5}^{+1.8}\times 10^{-12} $$

Wind-like CSM (s = 2)

f_Ni	–	log 𝒰 (10⁻³, 0.1)	$0 . 060_{- 0.010}^{+ 0.014}$ $Mathematical equation: $ 0.060_{-0.010}^{+0.014} $$	$0 . 085_{- 0.016}^{+ 0.010}$ $Mathematical equation: $ 0.085_{-0.016}^{+0.010} $$
E_k	10⁵¹ erg	log 𝒰 (0.01, 1.0)	$0 . 04_{- 0.01}^{+ 0.01}$ $Mathematical equation: $ 0.04_{-0.01}^{+0.01} $$	$0 . 02_{- 0.01}^{+ 0.01}$ $Mathematical equation: $ 0.02_{-0.01}^{+0.01} $$
M_CSM	M_⊙	log 𝒰 (0.05, 0.8)	$0 . 54_{- 0.04}^{+ 0.09}$ $Mathematical equation: $ 0.54_{-0.04}^{+0.09} $$	$0 . 66_{- 0.04}^{+ 0.05}$ $Mathematical equation: $ 0.66_{-0.04}^{+0.05} $$
M_ej	M_⊙	log 𝒰 (0.1, 10.0)	$0 . 30_{- 0.05}^{+ 0.05}$ $Mathematical equation: $ 0.30_{-0.05}^{+0.05} $$	$0 . 21_{- 0.02}^{+ 0.05}$ $Mathematical equation: $ 0.21_{-0.02}^{+0.05} $$
R₀	AU	log 𝒰 (10, 30)	$16 . 6_{- 0.8}^{+ 1.2}$ $Mathematical equation: $ 16.6_{-0.8}^{+1.2} $$	$14 . 1_{- 2.6}^{+ 3.3}$ $Mathematical equation: $ 14.1_{-2.6}^{+3.3} $$
ρ	g cm⁻³	log 𝒰 (1 × 10⁻¹⁴, 8 × 10⁻⁹)	$9 . 8_{- 2.5}^{+ 1.5} \times 10^{- 12}$ $Mathematical equation: $ 9.8_{-2.5}^{+1.5}\times 10^{-12} $$	$8 . 7_{- 2.4}^{+ 3.6} \times 10^{- 12}$ $Mathematical equation: $ 8.7_{-2.4}^{+3.6}\times 10^{-12} $$

Notes: log 𝒰(a, b) denotes a Log-Uniform prior distribution between a and b. 𝒰(a, b) denotes a Uniform distribution. Posterior values for log-parameters have been converted to a linear scale (median with 16^th and 84^th percentiles mapped accordingly).

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