Two black widow pulsars in the optical and X-rays | Astronomy & Astrophysics (A&A)

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Volume 690 (October 2024)

A&A, 690 (2024) A173

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Table 3.

The light-curve fitting results for J1513 and J2017.

Fitted parameters	J2017	J1513
Reddening E(B − V), mag	0.09 $_{- 0.01}^{+ 0.03}$ $_{-0.01}^{+0.03}$	0.07 $_{- 0.04}^{+ 0.03}$ $_{-0.04}^{+0.03}$
Distance D, kpc	2.40 $_{- 0.05}^{+ 0.10}$ $_{-0.05}^{+0.10}$	1.95(5)
Pulsar mass M_p, M_⊙	2.4(6)	1.7 $_{- 0.6}^{+ 1.0}$ $_{-0.6}^{+1.0}$
Mass ratio q = M_c/M_p	0.017(2)	0.012(1)
‘Night-side’ temp. T_n, 10³ K	3.0 $_{- 0.1}^{+ 0.2}$ $_{-0.1}^{+0.2}$	3.2(1)
Inclination i, deg	67 $_{- 7}^{+ 10}$ $_{-7}^{+10}$	70 $_{- 15}^{+ 20}$ $_{-15}^{+20}$
Roche lobe filling factor f	0.84(6)	1.0 $_{- 0.1}^{+ 0.0}$ $_{-0.1}^{+0.0}$
Irradiation factor K_irr,	0.7(1)	0.6(1)
10²⁰ erg cm⁻² s⁻¹ sr⁻¹

Derived parameters

Companion mass M_c, M_⊙	0.041	0.020
Companion radius R_c^x, R_⊙	0.122	0.114
Companion radius $R_{c}^{y}$ $R_{\mathrm{c}}^{\mathit{y}}$ , R_⊙	0.169	0.151
Min ‘day-side’ temp. $T_{d}^{\min}$ $T_{\mathrm{d}}^{\mathrm{min}}$ , 10³ K	3.3	3.2
Max ‘day-side’ temp. $T_{d}^{\max}$ $T_{\mathrm{d}}^{\mathrm{max}}$ , 10³ K	5.9	5.4
Irradiation efficiency η	0.6	0.05

Notes. Irradiation efficiencies η are calculated using the spin-down luminosities from Table 1. R_c^x and $R_{c}^{y}$ $R_{\mathrm{c}}^{\mathit{y}}$ are the radii of the ellipsoidal companion. The latter is along the line passing through the centres of the binary sources.

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