Possible Electromagnetic Phenomena during the Coalescence of Neutron Star-Black Hole Binary Systems

Abstract

Possible models for the generation of electromagnetic (EM) radiation during the coalescence of neutron star-black hole binaries are considered. The mass of the remnant disk around the black hole during the coalescence of neutron stars and black holes is calculated by taking into account the equation of state for neutron stars and the rotation of the binary components before the coalescence. The parameters of binary systems before the coalescence (the mass ratio, the component rotation, the neutron star magnetic field) are calculated by the population synthesis method. The derived mass of the remnant disk around the black hole after the coalescence is used to estimate the kinetic energy of the relativistic jet launched by the Blandford-Znajek mechanism. A disk mass of more than $\sim 0.05M_{\odot }$ required for the formation of short gamma-ray bursts is shown to be obtained in no more than 1-10\% of the coalescences (depending on the equation of state). Less efficient common envelopes (a large parameter ${\alpha }_{CE}$) lead to a noticeably larger percentage of events with astrophysically interesting EM energy release. For binaries with a large mass ratio, in which a magnetized neutron star is not subjected to tidal disruption before the coalescence, the possibility of the formation of an electrically charged rotating black hole (Wald charge) is considered and estimates of the maximum EM power released by such a black hole after the coalescence are made. The conversion of the emitted gravitational waves into electromagnetic ones in the relativistic lepton plasma generated in coalescing pulsar-black hole binaries at the pre-coalescence stage is discussed.

arXiv comment19 pages, 8 figures

References in corpus (23)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence
• Short-Hard Gamma-Ray Bursts
• A Decade of Short-duration Gamma-ray Burst Broad-band Afterglows: Energetics, Circumburst Densities, and Jet Opening Angles
• The Evolution of Compact Binary Star Systems
• Measurability of the tidal polarizability of neutron stars in late-inspiral gravitational-wave signals
• Merger and Mass Ejection of Neutron-Star Binaries
• Reconstructing the evolution of white dwarf binaries: further evidence for an alternative algorithm for the outcome of the common-envelope phase in close binaries
• Hierarchical data-driven approach to fitting numerical relativity data for nonprecessing binary black holes with an application to final spin and radiated energy
• Dynamical mass ejection from black hole-neutron star binaries
• Models of Kilonova/macronova emission from black hole-neutron star mergers
• A long-lived neutron star merger remnant in GW170817: constraints and clues from X-ray observations
• When Did the Remnant of GW170817 Collapse to a Black Hole?
• Radio pulsars: already fifty years!
• Radio wave emissions due to gravitational radiation
• Fast Radio Bursts
• Relativistic Binary Pulsars with Black-Hole Companions
• Conversion of relic gravitational waves into photons in cosmological magnetic fields
• Black Hole Pulsar
• Black hole spins in coalescing binary black holes
• Inspiral of a Spinning Black Hole--Magnetized Neutron Star Binary: Increasing Charge and Electromagnetic Emission
• Electromagnetic Radiation Accompanying Gravitational Waves from Black Hole Binaries
• Rapidly rotating neutron star progenitors

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• Stripping of a neutron star in a close binary system in a pair with a black hole
• Gravitational wave astronomy: astrophysical and cosmological inferences