4FGL J1544.2−2554: A new spider pulsar candidate

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Table 2.

The light curve fitting results for J1544.

Fixed parameters

Orbital period, h	2.724
Reddening E(B − V), mag	0.23
Fitted parameters

NS mass M_NS, M_⊙	$1 . 96_{- 0.60}^{+ 1.00}$ $1.96_{-0.60}^{+1.00}$
Mass ratio q = M_c/M_NS	0.052(5)
Distance D, kpc	2.13(5)
‘Night-side’ temperature T_n, K	3060 $_{- 60}^{+ 120}$ $_{-60}^{+120}$
Inclination i, deg	83 $_{- 11}^{+ 7}$ $_{-11}^{+7}$
Roche lobe filling factor f_x	0.65(5)
Irradiation factor K_irr, erg cm⁻² s⁻¹ sr⁻¹	2.20(14)×10²⁰

χ²/d.o.f.	101/50

Derived parameters

Companion mass M_c, M_⊙	0.102
Companion radius R_c, x, R_⊙	0.21
Companion radius R_c, y, R_⊙	0.14
Lowest ‘day-side’ temperature $T_{d}^{\min}$ $T_{\mathrm{d}}^{\mathrm{min}}$ , K	4010
Highest ‘day-side’ temperature $T_{d}^{\max}$ $T_{\mathrm{d}}^{\mathrm{max}}$ , K	7260

Notes. The Roche lobe filling factor is defined as a ratio of distances from the centre of mass of the secondary to the star surface and to the Lagrange point L₁.

R_c, x and R_c, y are the radii of the ellipsoidal companion. The latter is along the line passing through the centres of the binary sources.

Numbers in parentheses denote the 1σ uncertainties related to the last significant digits.

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