Missing for 20 years: MeerKAT re-detects the elusive binary pulsar M30B

Abstract

PSR J2140$-$2311B is a 13-ms pulsar discovered in 2001 in a 7.8-hour Green Bank Telescope (GBT) observation of the core-collapsed globular cluster M30 and predicted to be in a highly eccentric binary orbit. This pulsar has eluded detection since then, therefore its precise orbital parameters have remained a mystery until now. In this work, we present the confirmation of this pulsar using observations taken with the UHF receivers of the MeerKAT telescope as part of the TRAPUM Large Survey Project. Taking advantage of the beamforming capability of our backends, we have localized it, placing it $1.2(1{)}^{\prime }$ from the cluster centre. Our observations have enabled the determination of its orbit: it is highly eccentric ($e=0.879$) with an orbital period of $6.2$ days. We also measured the rate of periastron advance, $\dot{\omega }=0.078\pm 0.002\mathrm{deg}\mathrm{y}{\mathrm{r}}^{-1}$. Assuming that this effect is fully relativistic, general relativity provides an estimate of the total mass of the system, $M_{\mathrm{TOT}}=2.53\pm 0.08$ M${}_{\odot }$, consistent with the lightest double neutron star systems known. Combining this with the mass function of the system gives the pulsar and companion masses of $m_p<1.43{\mathrm{M}}_{\odot }$ and $m_c>1.10{\mathrm{M}}_{\odot }$ respectively. The massive, undetected companion could either be a massive WD or a NS. M30B likely formed as a result of a secondary exchange encounter. Future timing observations will allow the determination of a phase-coherent timing solution, vastly improving our uncertainty in $\dot{\omega }$ and likely enabling the detection of additional relativistic effects which will determine $m_p$ and $m_c$.

arXiv commentAccepted for publication in the Astrophysical Journal Letters (ApJL)

References in corpus (50)

• 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
• Fourier Techniques for Very Long Astrophysical Time Series Analysis
• Formation and evolution of compact binaries in globular clusters: II. Binaries with neutron stars
• Formation of millisecond pulsars with CO white dwarf companions - II. Accretion, spin-up, true ages and comparison to MSPs with He white dwarf companions
• Accreted versus In Situ Milky Way Globular Clusters
• The Timing of Nine Globular Cluster Pulsars
• The MeerKAT Telescope as a Pulsar Facility: System verification and early science results from MeerTime
• Measurement of Orbital Decay in the Double Neutron Star Binary PSR B2127+11C
• PALFA Discovery of a Highly Relativistic Double Neutron Star Binary
• Dynamics and Interactions of Binaries and Neutron Stars in Globular Clusters
• Searching for pulsars using image pattern recognition
• Long-term observations of the pulsars in 47 Tucanae - II. Proper motions, accelerations and jerks
• A New Search Technique for Short Orbital Period Binary Pulsars
• On the disruption of pulsar and X-ray binaries in globular clusters
• Using long-term millisecond pulsar timing to obtain physical characteristics of the bulge globular cluster Terzan 5
• A pulsar-based timescale from the International Pulsar Timing Array
• The orthometric parameterisation of the Shapiro delay and an improved test of general relativity with binary pulsars
• Eight new millisecond pulsars from the first MeerKAT globular cluster census
• Millisecond Pulsars and Black Holes in Globular Clusters
• Double Neutron Star Populations and Formation Channels
• Discovery of Five Binary Radio Pulsars
• Evidence for an intermediate-mass black hole in the globular cluster NGC 6624
• An algorithm for determining the rotation count of pulsars
• Random template banks and relaxed lattice coverings
• Upgraded Giant Metrewave Radio Telescope timing of NGC 1851A: a possible millisecond pulsar-neutron star system
• Formation of Ultracompact X-ray Binaries in Dense Star Clusters
• The Einstein@Home search for radio pulsars and PSR J2007+2722 discovery
• Pulsar J1411+2551: A Low Mass New Double Neutron Star System
• GMRT Discovery of A Millisecond Pulsar in a Very Eccentric Binary System
• A precise mass measurement of the intermediate-mass binary pulsar PSR J1802-2124
• Einstein@Home Discovery of 24 Pulsars in the Parkes Multi-beam Pulsar Survey
• White Dwarf Subsystems in Core-Collapsed Globular Clusters
• GBT Discovery of Two Binary Millisecond Pulsars in the Globular Cluster M30
• Internal gas models and central black hole in 47 Tucanae using millisecond pulsars
• A Stellar Audit: The Computation of Encounter Rates for 47 Tucanae and omega Centauri
• IQRM: real-time adaptive RFI masking for radio transient and pulsar searches
• Timing the Eccentric Binary Millisecond Pulsar in NGC 1851
• Wide field beamformed observation with MeerKAT
• TRAPUM discovery of thirteen new pulsars in NGC 1851 using MeerKAT
• A Highly Eccentric 3.9-Millisecond Binary Pulsar in the Globular Cluster NGC 6652
• Pulsar Candidate Identification Using Semi-Supervised Generative Adversarial Networks
• Compact Object Modeling in the Globular Cluster 47 Tucanae
• Four pulsar discoveries in NGC 6624 by TRAPUM using MeerKAT
• Upgraded GMRT survey for pulsars in globular clusters. I: Discovery of a millisecond binary pulsar in NGC 6652
• Determination of the orbital parameters of binary pulsars
• Coherent Search for Binary Pulsars across all Five Keplerian Parameters in Radio Observations using the template-bank algorithm
• Radial Color Gradient and Main Sequence Mass Segregation in M30 (NGC 7099)

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• Maximum gravitational mass $M_{\mathrm{TOV}}=2.25_{-0.07}^{+0.08}{M}_{\odot }$ inferred at about $3\%$ precision with multimessenger data of neutron stars
• Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5
• Lower-mass-gap Black Holes in Dense Star Clusters
• Mass Distribution and Maximum Mass of Neutron Stars: Effects of Orbital Inclination Angle
• Neutron star mass in dark matter clumps
• NGC 1851A: Revealing an ongoing three-body encounter in a dense globular cluster
• Timing Gamma-ray Pulsars using Gibbs Sampling
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