A MeerKAT view of the double pulsar eclipses -- Geodetic precession of pulsar B and system geometry

Abstract

The double pulsar system, PSR J0737$-$3039A/B, consists of two neutron stars bound together in a highly relativistic orbit that is viewed nearly edge-on from the Earth. This alignment results in brief radio eclipses of the fast-rotating pulsar A when it passes behind the toroidal magnetosphere of the slow-rotating pulsar B. The morphology of these eclipses is strongly dependent on the geometric orientation and rotation phase of pulsar B, and their time-evolution can be used to constrain the geodetic precession rate of the pulsar. We demonstrate a Bayesian inference framework for modelling eclipse light-curves obtained with MeerKAT between 2019-2023. Using a hierarchical inference approach, we obtained a precession rate of ${\Omega }_{\mathrm{SO}}^{\mathrm{B}}={5.16^{\circ }}_{-0.34^{\circ }}^{+0.32^{\circ }}$ yr${}^{-1}$ for pulsar B, consistent with predictions from General Relativity to a relative uncertainty of 6.5%. This updated measurement provides a 6.1% test of relativistic spin-orbit coupling in the strong-field regime. We show that a simultaneous fit to all of our observed eclipses can in principle return a $\sim$1.5% test of spin-orbit coupling. However, systematic effects introduced by the current geometric orientation of pulsar B along with inconsistencies between the observed and predicted eclipse light curves result in difficult to quantify uncertainties. Assuming the validity of General Relativity, we definitively show that the spin-axis of pulsar B is misaligned from the total angular momentum vector by $40.6^{\circ }\pm 0.1^{\circ }$ and that the orbit of the system is inclined by approximately $90.5^{\circ }$ from the direction of our line of sight. Our measured geometry for pulsar B suggests the largely empty emission cone contains an elongated horseshoe shaped beam centered on the magnetic axis, and that it may not be re-detected as a radio pulsar until early-2035.

arXiv commentAbridged abstract. 13 pages, 9 figures and 2 tables

References in corpus (41)

• MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
• X-ray spectral modelling of the AGN obscuring region in the CDFS: Bayesian model selection and catalogue
• Bilby: A user-friendly Bayesian inference library for gravitational-wave astronomy
• Tests of general relativity from timing the double pulsar
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• An increased estimate of the merger rate of double neutron stars from observations of a highly relativistic system
• A Double-Pulsar System - A Rare Laboratory for Relativistic Gravity and Plasma Physics
• Formation of Double Neutron Star Systems
• DSPSR: Digital Signal Processing Software for Pulsar Astronomy
• On the formation history of Galactic double neutron stars
• Determination of the geometry of the PSR B1913+16 system by geodetic precession
• A Comprehensive Study of Relativistic Gravity using PSR B1534+12
• General Relativistic Geodetic Spin Precession in Binary Pulsar B1913+16: Mapping the Emission Beam in Two Dimensions
• The Binary Companion of Young, Relativistic Pulsar J1906+0746
• Implications of PSR J0737-3039B for the Galactic NS-NS Binary Merger Rate
• Radio emission from a pulsar's magnetic pole revealed by general relativity
• Magnetospheric Eclipses in the Binary Pulsar J0737-3039
• The Evolution of PSR J0737-3039B and a Model for Relativistic Spin Precession
• The Double Pulsar System J0737-3039: Modulation of A by B at eclipse
• Observations and Modelling of Relativistic Spin Precession in PSR J1141-6545
• Long-term variations in the pulse emission from PSR J0737-3039B
• The Thousand-Pulsar-Array programme on MeerKAT XI: Application of the rotating vector model
• Probing the Eclipse of J0737-3039A with Scintillation
• Green Bank Telescope Observations of the Eclipse of Pulsar "A" in the Double Pulsar Binary PSR J0737-3039
• The Formation of the Double Pulsar PSR J0737-3039A/B
• Green Bank Telescope Measurement of the Systemic Velocity of the Double Pulsar Binary J0737-3039 and Implications for its Formation
• Interstellar Scintillation of the Double Pulsar J0737$-$3039
• The Relativistic Binary Programme on MeerKAT: Science objectives and first results
• The nature of pulsar radio emission
• Spin Tilts in the Double Pulsar Reveal Supernova Spin Angular-Momentum Production
• A Simple Model for Pulse Profiles from Precessing Pulsars, with Special Application to Relativistic Binary PSR B1913+16
• The Double Pulsar Eclipses I: Phenomenology and Multi-frequency Analysis
• Gravitational signal propagation in the Double Pulsar studied with the MeerKAT telescope
• Precision astrometry of pulsars and other compact radio sources in the globular cluster M15
• Characterizing Astrophysical Binary Neutron Stars with Gravitational Waves
• Relativistic spin precession in the binary PSR J1141$-$6545
• PSR J0737-3039B: A probe of radio pulsar emission heights
• New constraints on the kinematic, relativistic and evolutionary properties of the PSR J1757$-$1854 double neutron star system
• Radio Emission Region Exposed: Courtesy of the Double Pulsar
• Understanding and improving the timing of PSR J0737-3039B
• Realistic Modeling of the Pulse Profile of PSR J0737-3039A

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