|Numerical studies of turbulence in Supernova Remnants using expanding mesh hydrodynamics
|Soham Mandal, Purdue University
|Event Type: Informal Astro Talk
|Time: 9:30 AM - 10:00 AM
|Location: 726 Broadway, 901, Sm Conf
|Abstract: Turbulent activity in supernova remnants (SNRs) expanding against their surroundings gives rise to structures that may be related to small scale anisotropies seen in many remnants, such as Tycho’s SNR, SN 1006, Kepler's SNR etc. We study this with a suite of 3D hydrodynamical models developed using my novel hydro code Sprout, which solves hydro equations on an expanding Cartesian mesh. This provides high dynamic range for many orders of magnitude of expansion with little numerical diffusion, capturing shocks and fine structures accurately. I will show that small scale anisotropies in SNRs provide a direct diagnostic of the density profile of the progenitor. I also argue that inhomogeneities in the ejecta or the surrounding medium do not leave an imprint on the turbulent activity in the remnant, unless they have a very large amplitude and form large-scale coherent structures.