Rosseland and Planck mean opacities for protoplanetary discs*
1
Astrophysical Institute and University Observatory, Schillergäßchen 2-3, 07745 Jena, Germany
2
Max-Planck-Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
3
Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
4
Institute of Astronomy and Astrophysics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
Corresponding author: D. Semenov, dima@astro.uni-jena.de
Received:
1
April
2003
Accepted:
8
August
2003
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 ~1500 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
K and gas densities ranging from 10-18 g cm-3 to
10-7 g cm-3. 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.
Key words: accretion, accretion discs / hydrodynamics / atomic processes / molecular processes / stars: planetary systems: protoplanetary discs
© ESO, 2003