Kinematic Evidence for Open Cluster Origins of Galactic Binary Neutron Stars

Abstract

We investigate the potential birthplace of Galactic binary neutron star (BNS) systems through a kinematic analysis. Using high-precision astrometry from Gaia DR3, updated pulsar distances, and Monte Carlo sampling of astrometric errors, we integrate the past trajectories of 11 Galactic BNSs and 167 globular clusters plus 2967 open clusters, to search for past encounters. Our results suggest that BNS origin in globular clusters is unlikely, with low encounter probabilities (e.g., $\lesssim 0.5\%$ for NGC 5139) and requiring excessive ejection velocities. Conversely, our analysis indicates that open clusters are a non-negligible formation channel. Specifically, the double pulsar J0737$-$3039 shows a $13.9\%$ ($5.4\%$) probability of originating from the young cluster OC 0450 (Theia 58). Based on encounter proximity and time, we argue that Theia 58 is its more plausible birthplace. Our work provides kinematic evidence consistent with an open-cluster origin for a subset of field BNSs.

11 pages, 2 figures, 6 tables

References in corpus (15)

• Array Programming with NumPy
• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• Multi-messenger Observations of a Binary Neutron Star Merger
• galpy: A Python Library for Galactic Dynamics
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• Formation of Double Neutron Star Systems
• Gaia EDR3 view on Galactic globular clusters
• Improving the open cluster census. II. An all-sky cluster catalogue with Gaia DR3
• On the Rate of Neutron Star Binary Mergers from Globular Clusters
• Constraints on Natal Kicks in Galactic Double Neutron Star Systems
• Age constraints in the double pulsar system J0737-3039
• On the initial spin period distribution of neutron stars
• The systemic recoil velocity distribution and the scale height of field millisecond pulsar systems: Implications on neutron star retention fractions in star clusters
• A Census of Pulsars in Possible Association with Galactic Open Clusters