Orbital spin dynamics of a millisecond pulsar around a massive black hole with an general mass quadrupole
Abstract
We investigate the spin dynamics of a millisecond pulsar (MSP) in compact orbit around a Kerr-like massive black hole 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 spacetime 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.
Keywords
Cite
@article{arxiv.2007.05219,
title = {Orbital spin dynamics of a millisecond pulsar around a massive black hole with an general mass quadrupole},
author = {Tom Kimpson and Kinwah Wu and Silvia Zane},
journal= {arXiv preprint arXiv:2007.05219},
year = {2020}
}
Comments
11 pages, 11 figures, accepted for publication in MNRAS