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# CAXS Wiki home page
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# Exo-REM Wiki home page
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## Synopsis
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CAXS stands for "Calculate Absorption Cross Sections". The software is capable of calculating the absorption cross
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sections of any species over a wide range of wavenumbers. Individual species can be combined together (for example
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using isotopic ratios). The cross sections can be calculated either using a pressure-temperature profile or a grid of
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pressures and temperatures.
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For the methane (CH4) species, lines data from [Rey et al. 2017](http://theorets.tsu.ru/molecules.ch4.hybrid) can be
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used.
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Exo-REM is a 1D radiative-equilibrium model first developed for the simulation of young gas giants far from their star and brown dwarfs. Fluxes are calculated using the two-stream approximation assuming hemispheric closure. The radiative-convective equilibrium is solved assuming that the net flux (radiative + convective) is conservative. The conservation of flux over the pressure grid is solved iteratively using a constrained linear inversion method. Rayleigh scattering from H2, He and H2O, as well as absorption and scattering by clouds (calculated from extinction coefficient, single scattering albedo, and asymmetry factor interpolated from precomputed tables for a set of wavelengths and particle radii) are also taken into account.
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## Motivation
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CAXS is meant to be easy to use and parametrize, and its outputs easily transportable.
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It is written in Fortran, and should be easy to understand, maintain and modify.
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## Installation
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Visit the CAXS [installation instructions page](/dblain/pytheas/wikis/how-to-install).
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The installation process is also detailed in the *README*.
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## Getting started
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Learn how to use CAXS by following the tutorials on the [CAXS getting started page](/dblain/pytheas/wikis/getting-started).
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Instructions to setup and launch the software are also available in the *README*.
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## Documentation
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Details about CAXS can be found in the [CAXS documentation](/dblain/pytheas/wikis/documentation). |
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Exo-REM is meant to be easy to use and parametrize, and its outputs easily transportable. It is written in Fortran, and should be easy to understand, maintain and modify. |
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