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Orbital spin dynamics of a millisecond pulsar around a massive black hole with an general mass quadrupole

Kimpson, T; Wu, K; Zane, S; (2020) Orbital spin dynamics of a millisecond pulsar around a massive black hole with an general mass quadrupole. Monthly Notices of the Royal Astronomical Society , 497 (4) pp. 5421-5431. 10.1093/mnras/staa2103. Green open access

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Abstract

We investigate the spin dynamics of a millisecond pulsar (MSP) in compact orbit around a Kerr-like massive BH with an general mass quadrupole. We use the Mathisson–Papetrou–Dixon formulation to compute the orbital and spin evolution of the MSP, accounting for the non-linear interaction of the pulsar’s energy–momentum tensor on the background space–time metric. We investigate how the MSP spin and BH quadrupole moment manifest in the pulsar spin-orbital dynamics. We discuss the astrophysical observational implications of these spin and orbital dynamics on the timing of a radio pulsar in an extreme mass ratio binary, e.g. a Galactic Centre pulsar. In particular, notable timing variations in the Einstein delay and Roemer delay are observed, along with modifications to the pulsar pulse profile.

Type: Article
Title: Orbital spin dynamics of a millisecond pulsar around a massive black hole with an general mass quadrupole
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/staa2103
Publisher version: https://doi.org/10.1093/mnras/staa2103
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: black hole physics, gravitation, relativistic processes, pulsars: general
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10105042
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