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Jets from Tidal Disruptions of Stars by Black Holes
Julian H. Krolik, Tsvi Piran
Tidal disruption of main sequence stars by black holes has generally been thought to lead to a signal dominated by UV emission. If, however, the black hole spins rapidly and the po…
Three Dimensional MHD Simulation of Circumbinary Accretion Disks: Disk Structures and Angular Momentum Transport
Ji-Ming Shi, Julian H. Krolik, Stephen H. Lubow +1
We present the first three-dimensional magnetohydrodynamic (MHD) simulations of a circumbinary disk surrounding an equal mass binary. The binary maintains a fixed circular orbit of…
Swift J1644+57: A White Dwarf Tidally Disrupted by a 10^4 M_{odot} Black Hole?
Julian H. Krolik, Tsvi Piran
We propose that the remarkable object Swift J1644+57, in which multiple recurring hard X-ray flares were seen over a span of several days, is a system in which a white dwarf was ti…
Radiative efficiency and thermal spectrum of accretion onto Schwarzschild black holes
Scott C. Noble, Julian H. Krolik, Jeremy D. Schnittman +1
Recent general relativistic magneto-hydrodynamic (MHD) simulations of accretion onto black holes have shown that, contrary to the basic assumptions of the Novikov-Thorne model, the…
Assessing Quantitative Results in Accretion Simulations: From Local to Global
John F. Hawley, Xiaoyue Guan, Julian H. Krolik
Discretized numerical simulations are a powerful tool for investigation of nonlinear MHD turbulence in accretion disks. However, confidence in their quantitative predictions requir…
Dissipation and Vertical Energy Transport in Radiation-Dominated Accretion Disks
Omer Blaes, Julian H. Krolik, Shigenobu Hirose +1
Standard models of radiation supported accretion disks generally assume that diffusive radiation flux is solely responsible for vertical heat transport. This requires that heat mus…