Rosseland and Planck Mean Opacities for Protoplanetary Discs

Details Rosseland and Planck Mean Opacities for Protoplanetary Discs Rosseland and Planck Mean Opacities for Protoplanetary Discs

2003-08-20

arxiv.org/abs/astro-ph/0308344v1

Astron.Astrophys.410:611-622,2003

Astronomy and Astrophysics

Astrophysics

12 pages, 4 figures, to be published in A&A, 2003

Scientific paper

10.1051/0004-6361:20031279

In this paper, we present mean gas and dust opacities relevant to the physical conditions typical of protoplanetary discs. As the principal absorber for temperatures below ~1,500 K, we consider spherical and aggregate dust particles of various sizes, chemical structure, and porosity, consisting of ice, organics, troilite, silicates, and iron. For higher temperatures, ions, atoms, molecules, and electrons are included as the main opacity sources. Rosseland and Planck mean opacities are calculated for temperatures between 5 K and 10,000 K and gas densities ranging from 10^{-18} g/ccm to 10^{-7} g/ccm. The dependence on the adopted model of dust grains is investigated. We compare our results with recent opacity tables and show how different opacity models affect the calculated hydrodynamical structure of accretion discs.

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