Circumbinary accretion disks can enter a magnetically arrested state, and in weakly cooled or adiabatic regimes the resulting magnetic flux eruptions may drive the binary orbit to shrink.
Particle acceleration by magnetic Rayleigh-Taylor instability: mechanism for flares in black-hole accretion flows
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We study the magnetic Rayleigh-Taylor instability in relativistic collisionless plasma, as an astrophysical process for nonthermal particle acceleration. We consider dense plasma on top of a highly magnetized cavity with sheared magnetic field. Using particle-in-cell simulations, we show that small plumes grow and merge progressively to form a large-scale plume, which broadens to drive rapid magnetic reconnection in the cavity. We find that this leads to efficient particle acceleration capable of explaining flares from the inner accretion flow onto the black hole Sgr A*.
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$\textit{BMAD}$-Circumbinary Magnetically Arrested Disks around Stellar or Black Hole Binaries: Hot Accretion Flows, Disk Properties, and Angular Momentum Transfer
Circumbinary accretion disks can enter a magnetically arrested state, and in weakly cooled or adiabatic regimes the resulting magnetic flux eruptions may drive the binary orbit to shrink.