Rosseland and Planck mean opacities for protoplanetary discs

D Semenov, Th Henning, Christiane Helling, M Ilgner, E Sedlmayr

Research output: Contribution to journalArticlepeer-review

356 Citations (Scopus)

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 similar to1500 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 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.

Original languageEnglish
Pages (from-to)611-621
Number of pages14
JournalAstronomy & Astrophysics
Volume410
Issue number2
DOIs
Publication statusPublished - Nov 2003

Keywords

  • accretion, accretion discs
  • hydrodynamics
  • atomic processes
  • molecular processes
  • stars : planetary systems : protoplanetary discs
  • NONLINEAR MODEL PULSATIONS
  • CARBON DUST OXIDATION
  • LONG-PERIOD CEPHEIDS
  • ACCRETION DISKS
  • STELLAR ATMOSPHERES
  • INTERSTELLAR GRAINS
  • MOLECULAR OPACITIES
  • CONTINUOUS ABSORPTION
  • PROTOSTELLAR CORES
  • INFRARED-SPECTRUM

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