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The gamma-rays that accompanied GW170817 and the observational signature of a magnetic jet breaking out of NS merger ejecta
Omer Bromberg, Alexander Tchekhovskoy, Ore Gottlieb +2
We present the first relativistic MHD numerical simulation of a magnetic jet that propagates through and emerges from the dynamical ejecta of a binary neutron star merger. Generate…
General-Relativistic Simulations of Four States of Accretion onto Millisecond Pulsars
Kyle Parfrey, Alexander Tchekhovskoy
Accreting neutron stars can power a wide range of astrophysical phenomena including short- and long-duration gamma-ray bursts, ultra-luminous X-ray sources, and X-ray binaries. Num…
The Radiative Efficiency and Spectra of Slowly Accreting Black Holes from Two-Temperature GRRMHD Simulations
Benjamin R. Ryan, Sean M. Ressler, Joshua C. Dolence +3
We present axisymmetric numerical simulations of radiatively inefficient accretion flows onto black holes combining general relativity, magnetohydrodynamics, self-consistent electr…
Formation of Precessing Jets by Tilted Black-hole Discs in 3D General Relativistic MHD Simulations
Matthew Liska, Casper Hesp, Alexander Tchekhovskoy +3
Gas falling into a black hole (BH) from large distances is unaware of BH spin direction, and misalignment between the accretion disc and BH spin is expected to be common. However,…
Heating of Accretion-Disk Coronae and Jets by General Relativistic MHD Turbulence
Benjamin D. G. Chandran, Francois Foucart, Alexander Tchekhovskoy
Turbulence in an accretion disk launches Alfvén waves (AWs) that propagate away from the disk along magnetic field lines. Because the Alfvén speed varies with distance from the dis…
How important is non-ideal physics in simulations of sub-Eddington accretion onto spinning black holes?
Francois Foucart, Mani Chandra, Charles F. Gammie +2
Black holes with accretion rates well below the Eddington rate are expected to be surrounded by low-density, hot, geometrically thick accretion disks. This includes the two black h…