PSR J0024$-$7204ai: a massive, eccentric binary system in the globular cluster 47 Tucanae

Abstract

In this paper we present PSR J0024$-$7204ai, a 13.026-ms binary pulsar recently discovered in the globular cluster 47 Tucanae by the MeerKAT radio telescope. This is the slowest spinning pulsar known in this globular cluster, and has a $\sim 1.67$-day orbit with an eccentricity of $e\approx 0.18$. Although it was not yet possible to derive an unambiguous phase-connected timing solution, by combining detections obtained from MeerKAT and archival Parkes data we were able to measure the rate of advance of periastron to high significance, $\dot{\omega }$ = 0.1601 $\pm 0.0046$ deg yr${}^{-1}$. This value implies a total system mass of $2.41\pm 0.11{\mathrm{M}}_{\odot }$ (68.3\% C. L.), which, when combined with the binary mass function, gives a maximum pulsar mass of $\sim 1.7{\mathrm{M}}_{\odot }$ and a minimum companion mass of $\sim 0.7{\mathrm{M}}_{\odot }$. Apart from being the slowest pulsar in 47~Tucanae, its orbit is by far the most eccentric and its companion is the most massive among all known binary pulsars in this globular cluster. One possibility is that system is an old MSP - Carbon-Oxygen White Dwarf binary, whose orbit was perturbed by stellar dynamical interactions in the cluster core. Further follow-up observations of this system will be essential for a more detailed characterisation of this system and its evolution.

10 pages, 7 figures, 5 tables. Accepted in the journal Astronomy & Astrophysics (A&A)

References in corpus (46)

• The ATNF Pulsar Catalogue
• PSRCHIVE and PSRFITS An Open Approach to Radio Pulsar Data Storage and Analysis
• Formation of Double Neutron Star Systems
• DSPSR: Digital Signal Processing Software for Pulsar Astronomy
• A catalogue of masses, structural parameters and velocity dispersion profiles of 112 Milky Way globular clusters
• Swings between rotation and accretion power in a millisecond binary pulsar
• Nominal values for selected solar and planetary quantities: IAU 2015 Resolution B3
• Distances and ages of NGC 6397, NGC 6752 and 47 Tuc
• An ultra-wide bandwidth (704 to 4032 MHz) receiver for the Parkes radio telescope
• Formation of millisecond pulsars with CO white dwarf companions - II. Accretion, spin-up, true ages and comparison to MSPs with He white dwarf companions
• The Timing of Nine Globular Cluster Pulsars
• The MeerKAT Telescope as a Pulsar Facility: System verification and early science results from MeerTime
• Detection of ionized gas in the globular cluster 47 Tucanae
• Measurement of Orbital Decay in the Double Neutron Star Binary PSR B2127+11C
• PALFA Discovery of a Highly Relativistic Double Neutron Star Binary
• Star count density profiles and structural parameters of 26 Galactic globular clusters
• Chandra X-Ray Observations of Nineteen Millisecond Pulsars in the Globular Cluster 47 Tucanae
• Long-term observations of the pulsars in 47 Tucanae - II. Proper motions, accelerations and jerks
• Chandra Study of a Complete Sample of Millisecond Pulsars in 47Tuc and NGC6397
• Formation of millisecond pulsars with CO white dwarf companions - I. PSR J1614-2230: Evidence for a neutron star born massive
• On the disruption of pulsar and X-ray binaries in globular clusters
• Timing the millisecond pulsars in 47 Tucanae
• A pulsar in a binary with a compact object in the mass gap between neutron stars and black holes
• Eight new millisecond pulsars from the first MeerKAT globular cluster census
• An X-ray Variable Millisecond Pulsar in the Globular Cluster 47 Tucanae: Closing the Link to Low Mass X-ray Binaries
• Long-term observations of the pulsars in 47 Tucanae. I. A study of four elusive binary systems
• An algorithm for determining the rotation count of pulsars
• Pulsar J1411+2551: A Low Mass New Double Neutron Star System
• GMRT Discovery of A Millisecond Pulsar in a Very Eccentric Binary System
• Optical Detection of a Variable Millisecond Pulsar Companion in 47 Tucanae
• The Spectral Energy Distributions of White Dwarfs in 47 Tucanae: The Distance to the Cluster
• A Millisecond Pulsar Optical Counterpart with Large-Amplitude Variability in the Globular Cluster 47 Tucanae
• The age of 47Tuc from self-consistent isochrone fits to colour-magnitude diagrams and the eclipsing member V69
• Internal gas models and central black hole in 47 Tucanae using millisecond pulsars
• Chandra studies of the globular cluster 47 Tucanae: A deeper X-ray source catalogue, five new X-ray counterparts to millisecond radio pulsars, and new constraints to r-mode instability window
• TRAPUM discovery of thirteen new pulsars in NGC 1851 using MeerKAT
• Optical Identification of He White Dwarfs Orbiting Four Millisecond Pulsars in the Globular Cluster 47 Tucanae
• Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5
• The Cluster Ages Experiment (CASE). VIII. Age and Distance of the Globular Cluster 47 Tuc from the Analysis of Two Detached Eclipsing Binaries
• Discovery of near-ultraviolet counterparts to millisecond pulsars in the globular cluster 47 Tucanae
• Missing for 20 years: MeerKAT re-detects the elusive binary pulsar M30B
• The FAST Globular Cluster Pulsar Survey (GC FANS)
• A MeerKAT look at the polarization of 47 Tucanae pulsars: magnetic field implications
• On the vanishing orbital X-ray variability of the eclipsing binary millisecond pulsar 47 Tuc W
• The double neutron star PSR J1946+2052 I. Masses and tests of general relativity
• NGC 1851A: Revealing an ongoing three-body encounter in a dense globular cluster