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

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Table 1.

Pulse period measurements.

Mission	Epoch	ObsID	Date (MJD)	P (ms) −415.0 ms	Ṗ (10⁻¹⁰ s s⁻¹)	Flux^a	PF (%)
X	X2/2013	0693760401	56621.21	4.712±0.008			20.2±2.3
X	X3/2014	0748390901	57002.00				20.5±1.7
X	XN1/2016	0781800101	57528.58			36.2±0.6	15.0±1.3
N	XN1/2016	80201010002	57528.18			36.2±0.6	26.7±1.9
X	2017A^b	0804670201	57886.17			17.1±0.8	13±5
X	2017B	0804670301	57893.66			15.7±0.4	9.5±1.7
N	2017B	30302005002	57892.71	0.8755±0.0020		15.7±0.4	18.6±2.8
X	2017C	0804670401	57904.90	0.724±0.010	−2±6	31.7±0.8	9.4±1.7
X	2017D	0804670501	57916.10				7.6±1.5
X	2017E	0804670601	57924.11			37.0±0.8	9.5±1.6
N	2017F	30302015002	57933.93			34.0±0.6	15.4±2.1
N	2017G	30302015004	57942.93			26.4±0.5	14.2±2.4
N	2017H	90301326002	58057.58		0.4±0.7	45.4±0.8	12.5±2.1
X	2017I	0804670701	58083.00			24.3±0.5	13.8±1.4
N	2017I	30302005004	58082.95			24.3±0.5	18.2±2.3

Notes. New data are presented below the horizontal line. For clarity, we also list the epoch labels for the archival data given in Fürst et al. (2016) and Walton et al. (2018b). The last column gives the pulsed fraction (PF). In the mission column “X” denotes XMM-Newton observations and “N” denotes NuSTAR data.

^(a)

Flux in 10⁻¹³ erg s⁻¹ cm⁻² between 3 and 10 keV.

^(b)

Pulsations were not significantly detected in epoch 2017A; we here list the most prominent period found in the data.

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