Nahoon: Time-dependent gas-phase chemical model

Valentine Wakelam 1
1 AMOR 2014
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : Nahoon is a gas-phase chemical model that computes the chemical evolution in a 1D temperature and density structure. It uses chemical networks downloaded from the KInetic Database for Astrochemistry (KIDA) but the model can be adapted to any network. The program is written in Fortran 90 and uses the DLSODES (double precision) solver from the ODEPACK package to solve the coupled stiff differential equations. The solver computes the chemical evolution of gas-phase species at a fixed temperature and density and can be used in one dimension (1D) if a grid of temperature, density, and visual extinction is provided. Grains, both neutral and negatively charged, and electrons are considered as chemical species and their concentrations are computed at the same time as those of the other species. Nahoon contains a test to check the temperature range of the validity of the rate coefficients and avoid extrapolations outside this range. A test is also included to check for duplication of chemical reactions, defined over complementary ranges of temperature.
Type de document :
Autre publication
2014ascl.soft09009W- Astrophysics Source Code Library, record ascl:1409.009. 2014, pp.09009
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Contributeur : Marie-Paule Pomies <>
Soumis le : mardi 7 octobre 2014 - 08:42:33
Dernière modification le : mardi 29 mai 2018 - 12:51:05




Valentine Wakelam. Nahoon: Time-dependent gas-phase chemical model. 2014ascl.soft09009W- Astrophysics Source Code Library, record ascl:1409.009. 2014, pp.09009. 〈hal-01071893〉



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