line-racer

line racer: An easy-to-use Python package for calculating (high-resolution) opacities from molecular and atomic line lists for atmospheric modeling

Welcome to the line racer repository! line racer is a Python package designed to compute high-resolution opacities from molecular and atomic line lists. It combines two methods to calculate the line profiles: A direct calculation method using the Humlicek algorithm (Humlícek, 1982) and a speedup for calculating the line wings based on Mollière et al. (2015) to calculate the lines with the most intensity. A sampling technique of the line profiles based on Min (2017) for an ultra fast calculation of the lower intensity lines. The opacities can directly be output in the pRT format used by the petitRADTRANS code (Mollière et al., 2019, Blain et al., 2024), but also in other atmospheric modeling and retrieval codes.

Documentation

The code documentation, installation guide, and tutorial can be found here.

Attribution

If you use line racer in your work, please cite the following zenodo repository:

@software{hagele_2026_20367386,
  author       = {Hägele, David B. and
                  Mollière, Paul and
                  Min, Michiel},
  title        = {line racer: Rapid Calculation of Exoplanetary
                   Radiative Opacities
                  },
  month        = jun,
  year         = 2026,
  publisher    = {Zenodo},
  version      = {1.3.3},
  doi          = {10.5281/zenodo.20367386},
  url          = {https://doi.org/10.5281/zenodo.20367386},
}

License

line racer is available under the MIT license. See the LICENSE file for more information.

Development Status
- 5 - Production/Stable
Environment
- Console
Intended Audience
- Science/Research
License
- OSI Approved :: MIT License
Natural Language
- English
Operating System
- OS Independent
Programming Language
- Fortran
- Python :: 3
Topic
- Scientific/Engineering :: Astronomy

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Uploaded Jul 15, 2026 Source

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