next up previous
Next: Introduction

Abstract:

In this paper, we present mean gas and dust opacities relevant to the physical conditions typical of protoplanetary discs. As a principal absorber for temperatures below $\sim
1\,500$ 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 from $10^{-18}$ gcm$^{-3}$ to $10^{-7}$ gcm$^{-3}$.

Rosseland and Planck Mean Opacities for Protoplanetary Discs

D. Semenov
Astrophysical Institute and University Observatory, Schillergäßchen 2-3, 07745 Jena, Germany,
Th. Henning
Max-Planck-Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany
M. Ilgner
Institute of Astronomy and Astrophysics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
Ch. Helling and E. Sedlmayr
Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstraße 36, 10623 Berlin, Germany





Dimitri Semenov 2003-03-10