Exploring the Potential for Detecting Rotational Instabilities in Binary Neutron Star Merger Remnants with Gravitational Wave Detectors

Abstract

We explore the potential for detecting rotational instabilities in the post-merger phase of binary neutron star mergers using different network configurations of upgraded and next-generation gravitational wave detectors. Our study employs numerically generated post-merger waveforms, which reveal the re-excitation of the $l=m=2$ $f$-mode at a time of $O(10)$ms after merger. We evaluate the detectability of these signals by injecting them into colored Gaussian noise and performing a reconstruction as a sum of wavelets using Bayesian inference. Computing the overlap between the reconstructed and injected signal, restricted to the instability part of the post-merger phase, we find that one could infer the presence of rotational instabilities with a network of planned 3rd-generation detectors, depending on the total mass and distance to the source. For a recently suggested high-frequency detector design, we find that the instability part would be detectable even at 200 Mpc, significantly increasing the anticipated detection rate. For a network consisting of the existing HLV detectors, but upgraded to twice the A+ sensitivity, we confirm that the peak frequency of the whole post-merger gravitational-wave emission could be detectable with a network signal-to-noise ratio of 8 at a distance of 40Mpc.

18 pages, 15 captured figures, submitted to PRD

References in corpus (32)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• Multi-messenger Observations of a Binary Neutron Star Merger
• Advanced LIGO
• An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB 170817A
• Exploring the Sensitivity of Next Generation Gravitational Wave Detectors
• INTEGRAL Detection of the First Prompt Gamma-Ray Signal Coincident with the Gravitational Wave Event GW170817
• The X-ray counterpart to the gravitational wave event GW 170817
• Neutron-star radius constraints from GW170817 and future detections
• BayesWave: Bayesian Inference for Gravitational Wave Bursts and Instrument Glitches
• Spectral properties of the post-merger gravitational-wave signal from binary neutron stars
• BayesLine: Bayesian Inference for Spectral Estimation of Gravitational Wave Detector Noise
• Reconstructing the neutron-star equation of state with gravitational-wave detectors from a realistic population of inspiralling binary neutron stars
• Properties of hypermassive neutron stars formed in mergers of spinning binaries
• The BayesWave analysis pipeline in the era of gravitational wave observations
• Neutron-star Radius from a Population of Binary Neutron Star Mergers
• Gravitational waves from relativistic neutron star mergers with nonzero-temperature equations of state
• Inferring the post-merger gravitational wave emission from binary neutron star coalescences
• Exploring the sensitivity of gravitational wave detectors to neutron star physics
• Prospects For High Frequency Burst Searches Following Binary Neutron Star Coalescence With Advanced Gravitational Wave Detectors
• Studying strong phase transitions in neutron stars with gravitational waves
• Modeling compact binary signals and instrumental glitches in gravitational wave data
• Spectral analysis of gravitational waves from binary neutron star merger remnants
• Nuclear physics constraints from binary neutron star mergers in the Einstein Telescope era
• Inferring the maximum and minimum mass of merging neutron stars with gravitational waves
• Axisymmetric models for neutron star merger remnants with realistic thermal and rotational profiles
• Instabilities in neutron-star postmerger remnants
• The intimate relation between the low T/W instability and the co-rotation point
• Unstable normal modes of low T/W dynamical instabilities in differentially rotating stars
• Enhancing gravitational-wave burst detection confidence in expanded detector networks with the BayesWave pipeline
• Prospects for the inference of inertial modes from hypermassive neutron stars with future gravitational-wave detectors
• The effect of noise artefacts on gravitational-wave searches for neutron star post-merger remnants

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