Evidence for enhanced mass transfer in the disc preceding the transition to the soft state in MAXI J1820+070

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Volume 700 (August 2025)

A&A, 700 (2025) A79

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Table 1.

Results of the power-law fitting ( $F_{ν, opt} \propto {F_{X}}^{β}$ $F_{\nu,\mathrm{opt}} \propto {F_{\mathrm{X}}}^{\beta}$ ) to the correlations between the optical (g′ band) flux density and the 2−10 keV X-ray (Swift/XRT, Insight-HXMT/LE) flux.

Band	State	β	ρ	p-value
g′–LE	HS1 (decay)	1.86 ± 0.12	0.85	5.12e−17


g′–LE	SS	0.58 ± 0.03	0.88	3.27e−12


g′–LE	SS+IMS	0.58 ± 0.02	0.86	1.42e−15


g′–LE	HS2 (optical rise)	−0.29 ± 0.02	−0.93	3.97e−05


g′–XRT	HS1 (rise)	0.45 ± 0.01	1.00 ^(a)	7.02e−25
g′–XRT	+HS2 (decay)	0.45 ± 0.01	1.00 ^(a)	7.02e−25

g′–XRT	SS	0.50 ± 0.05	0.71	6.81e−04

g′–XRT	SS+IMS	0.54 ± 0.03	0.62	1.01e−04


g′–XRT	mini-rises	0.26 ± 0.02	0.93	3.00e−06


g′–XRT	HS1 (rise)	0.45 ± 0.01	0.98	1.50e−42
	+HS2 (decay)
	+mini-decays

Notes.

^(a)

The ranks of the X-ray and optical band data are identical (i.e. the data are sorted in the same order). In this case, the Spearman correlation formula necessarily gives a result of 1.

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