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Halting Migration: Numerical Calculations of Corotation Torques in the Weakly Nonlinear Regime
Paul C. Duffell
Planets in their formative years can migrate due to the influence of gravitational torques in the protoplanetary disk they inhabit. For low-mass planets in an isothermal disk, it i…
Shallow Cavities in Multiple-Planet Systems
Paul C. Duffell, Ruobing Dong
Large cavities are often observed in protoplanetary disks, which might suggest the presence of planets opening gaps in the disk. Multiple planets are necessary to produce a wide ca…
Producing Magnetar Magnetic Fields in the Merger of Binary Neutron Stars
Bruno Giacomazzo, Jonathan Zrake, Paul Duffell +2
The merger of binary neutron stars (BNSs) can lead to large amplifications of the magnetic field due to the development of turbulence and instabilities in the fluid, such as the Ke…
Binary Black Hole Accretion During Inspiral and Merger
Brian D. Farris, Paul Duffell, Andrew I. MacFadyen +1
We present the results of 2D, moving mesh, viscous hydrodynamical simulations of accretion onto merging supermassive black hole (SMBH) binaries. We include viscous heating, shock h…
Balancing the load: A Voronoi based scheme for parallel computations
Elad Steinberg, Almog Yalinewich, Re'em Sari +1
The use of numerical simulations in science is ever increasing and with it the computational size. In many cases single processors are no longer adequate and simulations are run on…
From Engine to Afterglow: Collapsars Naturally Produce Top-Heavy Jets and Early-Time Plateaus in Gamma Ray Burst Afterglows
Paul C. Duffell, Andrew I. MacFadyen
We demonstrate that the steep decay and long plateau in the early phases of gamma ray burst (GRB) X-ray afterglows are naturally produced in the collapsar model, by a means ultimat…