AGNI

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An open-source model for extreme atmospheres on rocky exoplanets.

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<p align="center">
  <b>An open-source model for extreme atmospheres on rocky exoplanets</b>
</p>

## Overview
AGNI's primary purpose is to simulate the atmospheric temperature-, height-, and compositional-structures of atmospheres overlying magma oceans. It does this while ensuring that radiative-convective equilibrium is maintained throughout the atmosphere. [SOCRATES](https://proteus-framework.org/SOCRATES/) is used to perform correlated-k radiative transfer including: shortwave irradiation from the star, surface emission, line absorption, Rayleigh scattering, clouds, aerosols, and collisional absorption. Mixing length theory is used to parametrise convection. AGNI also supports real gas equations of state, self-gravitation, and various spectral surface compositions.  Pseudo-global climate modelling is supported through a multicolumn mode. Accounting for these energy transport processes permits an energy-conserving calculation of atmospheric structure, obtained using numerical optimisation, which also yields realistic cooling rates for young rocky planets with magma oceans.

Consult the [AGNI documentation](https://www.h-nicholls.space/AGNI/) for information about the model, including usage, functionality, and how to contribute.

Contact: see information on [my website homepage](https://www.h-nicholls.space/).

## Installation and usage
See the [**Getting Started**](https://www.h-nicholls.space/AGNI/dev/howto/getting_started/) page in the documentation for information on installing and using the model.

## Citation
If you use AGNI, please cite the following papers:
* Nicholls et al. (2025a)  - doi:[10.1093/mnras/stae2772](https://doi.org/10.1093/mnras/stae2772)
* Nicholls et al. (2025b)  - doi:[10.21105/joss.07726](https://doi.org/10.21105/joss.07726)
* Nicholls et al. (2026)   - doi:[10.1038/s41550-026-02815-8](https://doi.org/10.1038/s41550-026-02815-8)

## Repository structure
* `agni.jl`         - The main AGNI executable
* `LICENSE.txt`     - License for use and re-use
* `deps/`           - Package build scripts
* `docs/`           - Documentation source files
* `misc/`           - Miscellaneous files
* `out/`            - Model output files
* `res/`            - Resources (configs, thermodynamic data, etc.)
* `src/`            - Source code
* `test/`           - Tests for the code (see [Testing Documentation](https://www.h-nicholls.space/AGNI/dev/howto/testing/))

---------

Copyright © 2023-Present by Harrison Nicholls and collaborators. Source code is available under the [Apache-2.0](https://apache.org/licenses/LICENSE-2.0) license. Documentation and assets are available under the [CC-BY-4.0](https://creativecommons.org/licenses/by/4.0/) license.

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