Propeller effect in action: Unveiling quenched accretion in the transient X-ray pulsar 4U 0115+63

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Volume 702 (October 2025)

A&A, 702 (2025) A216

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Table 2.

Best-fitting spectral parameters for the averaged and phase-resolved spectra of 4U 0115+63.

Parameter	Obs1	Obs2	Obs2016	Averaged	ϕ₁	ϕ₂	ϕ₃	ϕ₄
C_Obs1	–	–	–	$1 . 14_{- 0.14}^{+ 0.22}$ $1.14^{+0.22}_{-0.14}$	1.14 (fixed)	1.14 (fixed)	1.14 (fixed)	1.14 (fixed)
C_Obs2	–	–	–	1 (fixed)	1 (fixed)	1 (fixed)	1 (fixed)	1 (fixed)
C_Obs2016	–	–	–	$0 . 73_{- 0.09}^{+ 0.13}$ $0.73^{+0.13}_{-0.09}$	0.73 (fixed)	0.73 (fixed)	0.73 (fixed)	0.73 (fixed)
N_H (10²² cm⁻²)	0.9 (fixed)	0.9 (fixed)	0.9 (fixed)	0.9 (fixed)	0.9 (fixed)	0.9 (fixed)	0.9 (fixed)	0.9 (fixed)
kT_BB (keV)	$0 . 44_{- 0.10}^{+ 0.02}$ $0.44^{+0.02}_{-0.10}$	$0 . 49_{- 0.06}^{+ 0.06}$ $0.49^{+0.06}_{-0.06}$	$0 . 43_{- 0.02}^{+ 0.02}$ $0.43^{+0.02}_{-0.02}$	$0 . 44_{- 0.01}^{+ 0.01}$ $0.44^{+0.01}_{-0.01}$	$0 . 47_{- 0.06}^{+ 0.08}$ $0.47^{+0.08}_{-0.06}$	$0 . 45_{- 0.04}^{+ 0.03}$ $0.45^{+0.03}_{-0.04}$	$0 . 47_{- 0.03}^{+ 0.03}$ $0.47^{+0.03}_{-0.03}$	$0 . 39_{- 0.05}^{+ 0.05}$ $0.39^{+0.05}_{-0.05}$
R_BB (km)	$0 . 39_{- 0.04}^{+ 0.07}$ $0.39^{+0.07}_{-0.04}$	$0 . 30_{- 0.05}^{+ 0.11}$ $0.30^{+0.11}_{-0.05}$	$0 . 32_{- 0.03}^{+ 0.03}$ $0.32^{+0.03}_{-0.03}$	$0 . 36_{- 0.03}^{+ 0.04}$ $0.36^{+0.04}_{-0.03}$	$0 . 26_{- 0.06}^{+ 0.10}$ $0.26^{+0.10}_{-0.06}$	$0 . 41_{- 0.06}^{+ 0.09}$ $0.41^{+0.09}_{-0.06}$	$0 . 42_{- 0.05}^{+ 0.08}$ $0.42^{+0.08}_{-0.05}$	$0 . 35_{- 0.07}^{+ 0.17}$ $0.35^{+0.17}_{-0.07}$
Flux (10⁻¹³ erg cm⁻² s⁻¹)	$2 . 38_{- 0.14}^{+ 0.15}$ $2.38^{+0.15}_{-0.14}$	$2 . 09_{- 0.18}^{+ 0.13}$ $2.09^{+0.13}_{-0.18}$	1.53 $_{- 0.01}^{+ 0.01}$ $^{+0.01}_{-0.01}$	$2 . 10_{- 0.23}^{+ 0.15}$ $2.10^{+0.15}_{-0.23}$	$1 . 47_{- 0.34}^{+ 0.34}$ $1.47^{+0.34}_{-0.34}$	$2 . 84_{- 0.37}^{+ 0.37}$ $2.84^{+0.37}_{-0.37}$	$3 . 95_{- 0.43}^{+ 0.43}$ $3.95^{+0.43}_{-0.43}$	$1 . 05_{- 0.22}^{+ 0.22}$ $1.05^{+0.22}_{-0.22}$
L_X (10³² erg s⁻¹)	$7 . 3_{- 0.4}^{+ 0.5}$ $7.3^{+0.5}_{-0.4}$	$6 . 4_{- 0.7}^{+ 0.4}$ $6.4^{+0.4}_{-0.7}$	4.8 $_{- 0.3}^{+ 0.3}$ $^{+0.3}_{-0.3}$	$6 . 4_{- 0.7}^{+ 0.5}$ $6.4^{+0.5}_{-0.7}$	$4 . 5_{- 0.8}^{+ 1.0}$ $4.5^{+1.0}_{-0.8}$	$8 . 7_{- 1.0}^{+ 1.1}$ $8.7^{+1.1}_{-1.0}$	$12 . 1_{- 1.2}^{+ 1.3}$ $12.1^{+1.3}_{-1.2}$	$3 . 2_{- 0.6}^{+ 0.7}$ $3.2^{+0.7}_{-0.6}$

C-statistic/d.o.f.	86.1/86	28.1/37	229.6/202	343.4/326	33.0/29	58.5/59	86.3/74	26.6/26

Notes. Unabsorbed X-ray fluxes and luminosities are calculated in the 0.3−10 keV energy range. The blackbody emission radius R_BB was estimated by assuming an isotropic source at a distance of 5.0 kpc.

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