The Torques Acting on Accreting Millisecond X-Ray Pulsars in the Outburst and Quiescent States, and During the Long-Term Evolution

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ID: 314221
2026
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Abstract
Abstract Accreting millisecond X-ray pulsars (AMXPs) are transient X-ray sources likely to be in the final evolutionary phases of low-mass X-ray binaries (LMXBs). In this work, we have investigated the torque and X-ray luminosity variations of five AMXPs during outburst and quiescence, using a model previously employed to explain some typical behaviours of LMXBs. Most of these systems spin-up in the outburst state and spin-down in quiescence, while they slow down on the long term. We have obtained reasonable results with the model in agreement with these observations. We have found that the torques produced by the disc-magnetosphere interaction, the magnetic dipole radiation, and the mass accretion are compatible with the X-ray luminosity and rotational properties of the sources in their outburst and quiescent states, and during the resultant long-term evolution. Nevertheless, our results are not sufficient to rule out the spin-down contribution of the gravitational radiation torques due to significant timing noise and uncertainties about the bolometric corrections for X-ray luminosity during the outbursts of some sources.
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openalex_W7161856219 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors F Ertugrul, A A Gençali, Ü Ertan, N Niang
Journal monthly notices of the royal astronomical society
Year 2026
DOI
10.1093/mnras/stag946
URL
https://doi.org/10.1093/mnras/stag946
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