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Introducing a Hybrid Method of Radiative Transfer in Smoothed Particle Hydrodynamics

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Original languageEnglish
Pages (from-to)377-380
JournalAIP Conference Proceedings
Volume1094
DOIs
Publication statusPublished - 1 Feb 2009

Abstract

We present a new method of incorporating radiative transfer into Smoothed Particle Hydrodynamics (SPH). There have been many recent attempts at radiative transfer in SPH [10, 11, 5, 13], however these are becoming increasingly complex, with some methods requiring thephotosphere to be mapped (which is often of non-trivial geometric shape), and extra conditions to be applied there (matching atmospheres as in [2], or specifying cooling at the photosphere as in [5]). The method of identifying the photosphere is usually a significant addition to the total simulation runtime, and often requires extra free parameters, the changing of which will affect the final results. Our method is not affected by such concerns, as the photosphere is constructed implicitly by the algorithm without the need for extra free parameters. The algorithm used is a synergy of two current formalisms for radiative effects: a) the polytropic cooling formalism proposed by[12], and b) flux-limited diffusion, used by many authors to simulate radiation transport in the optically thick regime (e.g. [5]). We present several tests of this method:

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