Radio timing in a millisecond pulsar – extreme/intermediate mass ratio binary system

Kimpson, Tom; Wu, Kinwah; Zane, S.

doi:10.1051/0004-6361/202038561

Cited by 6 publications

(4 citation statements)

References 72 publications

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“…Another possible extension of the work is to treat the pulsar as a point particle with a spin and to study the possible coupling effects between the spin and the pulsar orbit as well as the spin and the curved spacetime around the supermassive black hole within the accuracy of timing a milli second pulsar. In the work of Kimpson, T. et al (2020), the spin effects were treated numerically through light ray tracing method but without giving any explicit analytical expression for the corresponding time delay as a function of the orbital Kepler parameters or the emitted lightlike geodesics…”

Section: Discussionmentioning

confidence: 99%

Relativistic propagation and frame dragging time delay in the timing of a pulsar orbiting the supermassive black hole SgrA*

Ben-Salem¹,

Hackmann²

2022

Preprint

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Timing a pulsar in a close orbit around the supermassive black hole SgrA * at the center of the Milky Way would open the window for an accurate determination of the black hole parameters and for new tests of General Relativity and alternative modified gravity theories. An important relativistic effect which has to be taken into account in the timing model is the propagation delay of the pulses in the gravitational field of the black hole. Due to the extreme mass ratio of the pulsar and the supermassive back hole we use the test particle limit to derive an exact analytical formula for the propagation delay in a Kerr spacetime and deduce a relativistic formula for the frame dragging effect on the arrival time. As an illustration, we treat an edge-on orbit in which the frame dragging effect is expected to be maximal. We compare our formula for the propagation time delay with Post-Newtonian approaches, and in particular with the frame dragging terms derived in previous works by Wex & Kopeikin and Rafikov & Lai. Our approach correctly identifies the asymmetry of the frame dragging delay with respect to superior conjunction, avoids singularities in the time delay, and indicates that in the Post-Newtonian approach frame dragging effects are generally slightly overestimated.

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Section: Discussionmentioning

confidence: 99%

Relativistic propagation and frame dragging time delay in the timing of a pulsar orbiting the supermassive black hole SgrA*

Ben-Salem¹,

Hackmann²

2022

Preprint

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“…The author and collaborators have used the general methods and mathematics described in this package for multiple research projects (e.g. Kimpson et al, 2019Kimpson et al, , 2020aKimpson et al, , 2020bLi et al, 2019) with a particular focus on the radio signals from spinning pulsar systems. This package represents an attempt to create a documented, well-tested, open source resource for public use in this area, that can also be used as a computational playground for exploring techniques that could be applicable to more advanced numerical models.…”

Section: Statement Of Needmentioning

confidence: 99%

RelativisticDynamics.jl: Relativistic Spin-Orbital Dynamics in Julia

Kimpson

2023

JOSS

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“…The angular-momentum exchange will lead to complex orbital and spin dynamics of the MSP, and, in some situations, the orbit and spin precessions of the MSPs will show chaotic patterns (see [9][10][11]). These dynamical behaviours of the system will be reflected in the beaming of the pulsed radiation from the MSP (see, e.g., [12,13]).…”

Section: Introductionmentioning

confidence: 99%

Multi-Messenger Astrophysics of a Millisecond Pulsar Orbiting around a Massive Black Hole

2022

Universe

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Extreme-mass-ratio and intermediate-mass-ratio binaries with a millisecond pulsar are gravitational-wave sources that emit also electromagnetic radiation. The millisecond pulsars in these binaries have complex orbital and spin dynamics, which are observable because of spin–orbit and spin–spin coupling (through spin–curvature interaction). The strengths of the couplings generally depends on the mass ratio between the pulsar and the black hole. The narrow mass range of neutron stars gives an advantage in parameter extraction as it greatly reduces the search space, in particular, in the determination of the black-hole mass, in gravitational wave experiments and radio pulsar timing observations. Extreme-mass-ratio and intermediate-mass-ratio binaries with a millisecond pulsar will help to resolve the astrophysical problems, concerning the applicability of the M-σ relation for galactic spheroids extending to the very low-mass galaxies and whether or not low-mass dwarf galaxies and globular clusters would harbour a nuclear intermediate-mass black hole. The high-precision that can be achieved in gravitational wave experiments and radio pulsar timing observations will provide an opportunity to directly detect gravitational clock effects that are arisen from spin couplings. Radio monitoring of the orbital and spin evolution of the millisecond pulsar in an extreme-mass-ratio binary can be used as a bootstrap method for correcting the drifts in the phases in the gravitational waves from the extreme-mass-ratio and intermediate-mass-ratio binaries caused by self-force.

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Radio timing in a millisecond pulsar – extreme/intermediate mass ratio binary system

Cited by 6 publications

References 72 publications

Relativistic propagation and frame dragging time delay in the timing of a pulsar orbiting the supermassive black hole SgrA*

Relativistic propagation and frame dragging time delay in the timing of a pulsar orbiting the supermassive black hole SgrA*

RelativisticDynamics.jl: Relativistic Spin-Orbital Dynamics in Julia

Multi-Messenger Astrophysics of a Millisecond Pulsar Orbiting around a Massive Black Hole

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