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Simulating Black Widow Pulsar system with radiation hydrodynamics

2017 SIAM Conference on Computational Science and Engineering

Abstract. A tight binary system in which a millisecond pulsar is ablating its companion star gives the neutron star (pulsar) the name of Black Widow Pulsar (BWP). We will describe our methodology for modeling the interaction between the pulsar winds and the companion star. We are simulating the system using the radiation hydrodynamics code Castro. Castro is an adaptive mesh refinement (AMR) code that solves the compressible hydrodynamic equations for astrophysical flows with simultaneous refinement in space and time. We are employing the gray-radiation solver, which uses a mixed-frame formulation of radiation hydrodynamics under the flux-limited diffusion approximation.