Current sheet alignment in oblique black hole magnetospheres -- a black hole pulsar?

Abstract

We study the magnetospheric evolution of a non-accreting spinning black hole (BH) with an initially inclined split monopole magnetic field by means of three-dimensional general relativistic magnetohydrodynamics simulations. This serves as a model for a neutron star (NS) collapse or a BH-NS merger remnant after the inherited magnetosphere has settled into a split monopole field creating a striped wind. We show that the initially inclined split monopolar current sheet aligns over time with the BH equatorial plane. The inclination angle evolves exponentially towards alignment, with an alignment timescale that is inversely proportional to the square of the BH angular velocity, where higher spin results in faster alignment. Furthermore, magnetic reconnection in the current sheet leads to exponential decay of event horizon penetrating magnetic flux with nearly the same timescale for all considered BH spins. In addition, we present relations for the BH mass and spin in terms of the period and alignment timescale of the striped wind. The explored scenario of a rotating, aligning and reconnecting current sheet can potentially lead to multimessenger electromagnetic counterparts to a gravitational wave event due to the acceleration of particles powering high-energy radiation, plasmoid mergers resulting in coherent radio signals, and pulsating emission due to the initial misalignment of the BH magnetosphere.

arXiv comment16 pages, 9 figures

References in corpus (37)

• Using gravitational-wave observations and quasi-universal relations to constrain the maximum mass of neutron stars
• A Measurement of the Electromagnetic Luminosity of a Kerr Black Hole
• Fast Reconnection in High-Lundquist-Number Plasmas Due to Secondary Tearing Instabilities
• Black Hole Spin and the Radio Loud/Quiet Dichotomy of Active Galactic Nuclei
• Fast magnetic reconnection in the plasmoid-dominated regime
• Fast radio bursts: the last sign of supramassive neutron stars
• The Event Horizon General Relativistic Magnetohydrodynamic Code Comparison Project
• The Black Hole Accretion Code
• Black hole flares: ejection of accreted magnetic flux through 3D plasmoid-mediated reconnection
• Electrodynamics of black hole magnetospheres
• Magnetic Reconnection and Hot Spot Formation in Black Hole Accretion Disks
• Modeling of Gamma-Ray Pulsar Light Curves with Force-Free Magnetic Field
• Mass Ejection from the Remnant of a Binary Neutron Star Merger: Viscous-Radiation Hydrodynamics Study
• Magnetic reconnection and stochastic plasmoid chains in high-Lundquist-number plasmas
• A lower bound on the maximum mass if the secondary in GW190814 was once a rapidly spinning neutron star
• Ab-Initio Pulsar Magnetosphere: Particle acceleration in Oblique Rotators and High-energy Emission Modeling
• General Theory of the Plasmoid Instability
• Multimessenger constraints for ultra-dense matter
• Time evolution of pulsar obliquity angle from 3D simulations of magnetospheres
• Spacetime approach to force-free magnetospheres
• Constrained transport and adaptive mesh refinement in the Black Hole Accretion Code
• Pulsar Radio Emission Mechanism: Radio Nanoshots as a Low Frequency Afterglow of Relativistic Magnetic Reconnection
• The Fate of Neutron Star Binary Mergers
• Magnetic Hair and Reconnection in Black Hole Magnetospheres
• Multi-dimensional simulations of ergospheric pair discharges around black holes
• The spin parameter of uniformly rotating compact stars
• Particle-in-cell simulations of pair discharges in a starved magnetosphere of a Kerr black hole
• Radiative reconnection-powered TeV flares from the black hole magnetosphere in M87
• Slowly balding black holes
• Gravitational collapse to a Kerr-Newman black hole
• On the opening angle of magnetised jets from neutron-star mergers: the case of GRB170817A
• On the physics of cold MHD winds from oblique rotators
• Physics of Pair Producing Gaps in Black Hole Magnetospheres II -- General Relativity
• Multimessenger signals from black hole-neutron star mergers without significant tidal disruption
• Electromagnetic extraction of energy from Kerr black holes
• Effective resistivity in relativistic collisionless plasmoid-mediated reconnection
• A kinetic study of black hole activation by local plasma injection into the inner magnetosphere

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