A tale of two periods: determination of the orbital ephemeris of the super-Eddington pulsar NGC 7793 P13

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Table 2.

Best-fit orbital parameters for different input light curves.

Parameter	No input	Periodic var.	Linear trend
P_spin [ms]^a
ξ or b [s s⁻¹]^b
a sin i [lt-s]	(2.61±0.08) × 10²	(2.01±0.08) × 10²	(2.09±0.08) × 10²
P_orb [d]	63.732 ± 0.016
τ [MJD]
e	0.05 ± 0.04		0.05 ± 0.05
ω [deg]		38.1 ± 2.3	17.4 ± 2.2
χ²/d.o.f.	9.89/2	0.12/2	0.51/2

Notes. The first column assumes no input light curve, and therefore a constant spin-up ξ. The last column shows the results from the emcee run using the linear trend input light curve.

^(a)

At MJD 57530.00.

^(b)

Spin-up for 0.08 cts s⁻¹ in XRT.

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