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

Abstract

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.