Reduction of chemical networks. II. Analysis of the fractional ionisation in protoplanetary discs

Details Reduction of chemical networks. II. Analysis of the fractional ionisation in protoplanetary discs Reduction of chemical networks. II. Analysis of the fractional ionisation in protoplanetary discs

2004-03-23

arxiv.org/abs/astro-ph/0403555v1

Astron.Astrophys. 417 (2004) 93-106

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1051/0004-6361:20034128

(abridged) We analyse the evolution of the fractional ionisation in a steady-state protoplanetary disc with a vertical temperature gradient and with gas-grain chemistry including surface reactions. The ionisation due to stellar X-rays, stellar and interstellar UV radiation, cosmic rays and radionuclide decay is taken into account. Using our reduction schemes as a tool for the analysis, we isolate small sets of chemical reactions that reproduce the evolution of the ionisation degree at representative disc locations with an accuracy of 50%-100%. Column densities of key molecules are calculated and compared to the results of other recent studies and observational data.

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