LELUYA -- the First Exact General 2D Radiative Transfer Solver

Details LELUYA -- the First Exact General 2D Radiative Transfer Solver LELUYA -- the First Exact General 2D Radiative Transfer Solver

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...200.8504v&link_type=abstract

American Astronomical Society, 200th AAS Meeting, #85.04; Bulletin of the American Astronomical Society, Vol. 34, p.786

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Observations of objects deeply imbedded in dust cannot be studied without exact solution of the multidimensional radiative transfer problem. LELUYA (www.leluya.org) is the first code capable of solving exactly an arbitrary axially symmetric multi-grain dust distribution around a heating source. A newly developed parallel algorithm automatically traces the dust density and optical depth gradients, creating the optimal adaptive grid, which is highly unstructured and triangular. Different grids are created this way for different wavelengths to accommodate the spectral variation of dust opacity. The radiative transfer problem, including dust absorption, emission and scattering, is solved exactly. Applications will be presented for two systems. CIT3 is an evolved star whose image seemed to require an unphysical binary system. I will show that this is an artifact of certain 2D dust geometry around a single star, which includes a non-spherical dust cavity. In young stellar objects, such as AB Aur, LELUYA provides the first tool capable of exact handling of non-spherical geometries, crucial for understanding configurations such as flared disks.

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