Hydrodynamical modeling of SN 2025kg associated with the fast X-ray transient EP250108a

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Table 1.

Parameters from hydrodynamic modeling for SN 2025kg, SN 2006aj, SN 2020bvc, and SN 2023pel.

SN	Model	E	M_ZAMS	M_Ni	M_ej	P	B	R_CSM	M_CSM	Reference
		[foe]	[M_⊙]	[M_⊙]	[M_⊙]	[ms]	[10¹⁴ G]	[R_⊙]	[M_⊙]
2025kg	Ni	2.2	13	0.85	1.9	–	–	–	–	This work
	Mag + CSM	2.4	18	0.2	3.4	2.9	28	500	0.27	This work

		2.91 $_{- 0.86}^{+ 1.36}$ $^{+1.36}_{-0.86}$	–	0.57 $_{- 0.3}^{+ 0.6}$ $^{+0.6}_{-0.3}$	1.66 $_{- 0.49}^{+ 0.79}$ $^{+0.79}_{-0.49}$	–	–	∼575	$0 . 07_{- 0.04}^{+ 0.06}$ $0.07^{+0.06}_{-0.04}$	S25
2025kg	Other	∼14	–	–	$2 . 42_{- 0.7}^{+ 0.67}$ $2.42^{+0.67}_{-0.7}$	14.46^±0.12	2.56^±0.06	–	–	L25
	Authors	–	15–30	0.2–0.6	0.8 $_{- 0.2}^{+ 0.5}$ $^{+0.5}_{-0.2}$	–	–	–	–	R25
		≲1	–	–	–	–	–	∼3000	0.2–0.9	EF25

2006aj	Ni + CSM	3	13	0.28	1.1	–	–	200	0.024	This work
2020bvc	Ni + CSM	7.5	15	0.23	2.6	–	–	100	0.04	This work
2023pel	Magnetar	2.3	18	0.24	3.4	3.2	28	–	–	RA25

Notes. Parameters derived for SN 2025kg by other authors, using semi-analytical models, are also presented.

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