Revisiting the Galactic Double Neutron Star merger and LIGO detection rates

Abstract

We revisit the merger rate for Galactic double neutron star (DNS) systems in light of recent observational insight into the longitudinal and latitudinal beam shape of the relativistic DNS PSR J1906$+$0746. Due to its young age and its relativistic orbit, the pulsar contributes significantly to the estimate of the joint Galactic merger rate. We follow previous analyses by modelling the underlying pulsar population of nine merging DNS systems and study the impact and resulting uncertainties when replacing simplifying assumptions made in the past with actual knowledge of the beam shape, its extent and the viewing geometry. We find that the individual contribution of PSR J1906$+$0746 increases to $R=6_{-5}^{+28}$ Myr${}^{-1}$ although the values is still consistent with previous estimates given the uncertainties. We also compute contributions to the merger rates from the other DNS systems by applying a generic beam shape derived from that of PSR J1906+0746, evaluating the impact of previous assumptions. We derive a joint Galactic DNS merger rate of $R_{\mathrm{MW}}^{\mathrm{gen}}=32_{-9}^{+19}$Myr${}^{-1}$, leading to a LIGO detection rate of $R_{\mathrm{LIGO}}^{\mathrm{gen}}=3.5_{-1.0}^{+2.1}$Myr${}^{-1}$ (90% conf. limit), considering the upcoming O3 sensitivity of LIGO. As these values are in good agreement with previous estimates, we conclude that the method of estimating the DNS merger and LIGO detection rates via the study of the radio pulsar DNS population is less prone to systematic uncertainties than previously thought.

Accepted for publication in MNRAS, 14 pages, 8 Figures

References in corpus (12)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• Tests of general relativity from timing the double pulsar
• Formation of Double Neutron Star Systems
• Double neutron stars: merger rates revisited
• Host Galaxies Catalog Used in LIGO Searches for Compact Binary Coalescence Events
• PSR J1756$-$2251: a pulsar with a low-mass neutron star companion
• The Binary Companion of Young, Relativistic Pulsar J1906+0746
• The population of pulsars with interpulses and the implications for beam evolution
• On the beam properties of radio pulsars with interpulse emission
• An Updated Galactic Double Neutron Star Merger Rate Based on Radio Pulsar Populations
• Relativistic spin precession in the binary PSR J1141$-$6545

Cited by in corpus (1)

• The MPIfR-MeerKAT Galactic Plane Survey II. The eccentric double neutron star system PSR J1208-5936 and a neutron star merger rate update