Dissecting the properties of neutron star - black hole mergers originating in dense star clusters

Abstract

The detection of gravitational waves emitted during a neutron star - black hole merger and the associated electromagnetic counterpart will provide a wealth of information about stellar evolution nuclear matter, and General Relativity. While the theoretical framework about neutron star - black hole binaries formed in isolation is well established, the picture is loosely constrained for those forming via dynamical interactions. Here, we use N-body simulations to show that mergers forming in globular and nuclear clusters could display distinctive marks compared to isolated mergers, namely larger masses, heavier black holes, and the tendency to have no associated electromagnetic counterpart. These features could represent a useful tool to interpreting forthcoming observations. In the Local Universe, gravitational waves emitted from dynamical mergers could be unravelled by detectors sensitive in the decihertz frequency band, while those occurring at the distance range of Andromeda and the Virgo Cluster could be accessible to lower-frequency detectors like LISA.

18 Pages, 10 Figures, 1 Table. Published in Communication Physics

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• Observation of Gravitational Waves from the Coalescence of a $2.5\text{-}4.5M_{\odot }$ Compact Object and a Neutron Star
• Impact of Massive Binary Star and Cosmic Evolution on Gravitational Wave Observations I: Black Hole-Neutron Star Mergers
• The Science of the Einstein Telescope
• High Eccentricities and High Masses Characterize Gravitational-wave Captures in Galactic Nuclei as Seen by Earth-based Detectors
• On the formation of GW190814
• Modelling Neutron Star-Black Hole Binaries: Future Pulsar Surveys and Gravitational Wave Detectors
• Preparing the next gravitational million-body simulations: Evolution of single and binary stars in Nbody6++GPU, MOCCA and McLuster
• Black hole-neutron star mergers are unlikely multi-messenger sources
• Quiescent and active galactic nuclei as factories of merging compact objects in the era of gravitational-wave astronomy
• Compact Binary Coalescences: Astrophysical Processes and Lessons Learned
• Gravitational Wave observatories may be able to detect hyperbolic encounters of Black Holes
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• Signatures of ultralight bosons in the orbital eccentricity of binary black holes
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• Simulations of the progenitors of black hole-neutron star gravitational wave sources
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• Primordial Black Hole-Neutron Star Merger Rate in Modified Gravity
• Detectability of stochastic gravitational wave background from weakly hyperbolic encounters
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• Efficient Stochastic Template Bank using Inner Product Inequalities
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• On the large apparent black hole spin-orbit misalignment angle in GW200115
• Astrophysics with the Laser Interferometer Space Antenna
• Formation of the First Two Black Hole-Neutron Star Mergers (GW200115 and GW200105) from Isolated Binary Evolution
• Challenges in Forming Millisecond Pulsar-Black Holes from Isolated Binaries
• Black Hole - Neutron Star and Binary Neutron Star Mergers from Population III and II stars
• Trails of clouds in binary black holes