SIMBAD references

2020MNRAS.494.3912K - Mon. Not. R. Astron. Soc., 494, 3912-3926 (2020)

Optical, X-ray, and γ-ray observations of the candidate transitional millisecond pulsar 4FGL J0427.8-6704.

KENNEDY M.R., BRETON R.P., CLARK C.J., DHILLON V.S., KERR M., BUCKLEY D.A.H., POTTER S.B., MATA SANCHEZ D., STRINGER J.G. and MARSH T.R.

Abstract (from CDS):

We present an optical, X-ray, and γ-ray study of 1SXPS J042749.2-670434, an eclipsing X-ray binary that has an associated γ-ray counterpart, 4FGL J0427.8-6704. This association has led to the source being classified as a transitional millisecond pulsar (tMSP) in an accreting state. We analyse 10.5 yr of Fermi LAT data and detect a γ-ray eclipse at the same phase as optical and X-ray eclipses at the >5 σ level, a significant improvement on the 2.8 σ level of the previous detection. The confirmation of this eclipse solidifies the association between the X-ray source and the γ-ray source, strengthening the tMSP classification. However, analysis of several optical data sets and an X-ray observation do not reveal a change in the source's median brightness over long time-scales or a bi-modality on short time-scales. Instead, the light curve is dominated by flickering, which has a correlation time of 2.6 min alongside a potential quasi-periodic oscillation at ∼21 min. The mass of the primary and secondary stars is constrained to be M1=1.43+0.33–0.19 M and M2=0.3+0.17–0.12 M through modelling of the optical light curve. While this is still consistent with a white dwarf primary, we favour the tMSP in a low accretion state classification due to the significance of the γ-ray eclipse detection.

Abstract Copyright: © The Author 2020. Published by Oxford University Press on behalf of The Royal Astronomical Society.

Journal keyword(s): accretion, accretion discs - binaries: eclipsing - stars: neutron - novae, cataclysmic variables - gamma-rays: stars - X-rays: binaries

Simbad objects: 9

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2021.06.14-19:55:37

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