exoctk

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Introduction

ExoCTK is an open-source, modular data analysis package focused primarily on atmospheric characterization of exoplanets. The subpackages included are:

Contamination and Visibility Calculator
Integrations and Groups Calculator
Transit Light-Curve Fitter
Limb Darkening Calculator
Phase Constraint Calculator
Atmospheric Forward Modeling

For more information on each package visit our documentation at readthedocs.

Most packages are also available through interactive tools at our web portal.

Installation

The following are instructions on how to install the exoctk package for both users and contributors. The exoctk repository provides a conda environment containing all of the dependencies needed to install and execute the exoctk software.

Download Anaconda or Miniconda

You must first have a working installation of conda (or mamba) for Python 3. If you do not yet have this on your system, you can visit the following links for download and installation instructions:

Obtain the exoctk Package

To obtain the exoctk package with the necessary environment file, clone the repository directly from GitHub:

git clone https://github.com/ExoCTK/exoctk.git
cd exoctk

Environment Installation

You can create the ExoCTK conda environment via the exoctk-env.yml file with the following conda (or mamba) command:

conda env create -f exoctk-env.yml

Tip

To specify a specific Python version (or any additional Conda packages), add them to the end of the conda env create command:

conda env create -f exoctk-env.yml python==3.11

One can activate the newly-created environment with:

conda activate exoctk-env

After activating the environment, install exoctk from the cloned source.

Package Installation From Source

To install the latest development version of exoctk use pip to install directly from the cloned source:

pip install -e .

Obtain the exoctk Data

To obtain the necessary data to run ExoCTK, you just need to execute the exoctk.utils.download_exoctk_data() function. This function will download a series of compressed files, extract the files, and organize them into an exoctk_data/ directory. Note that this can only be done once the exoctk package has been fully installed (see instructions above).

Lastly, export an environment variable for EXOCTK_DATA.

For Mac OS/Linux, add the line

export EXOCTK_DATA='/path/to/your/unzipped/directory/exoctk_data/'

to your .bashrc or .bash_profile.

For Windows, add an environment variable using System Utility.

Missing Dependencies?

If you find that the exoctk environment is missing a required dependency, please feel free to submit a GitHub Issue detailing the problem.

Citation

If you use ExoCTK for work/research presented in a publication (whether directly, or as a dependency to another package), we recommend and encourage the following acknowledgment:

This research made use of the open source Python package exoctk, the Exoplanet Characterization Toolkit (Bourque et al, 2021).

where (Bourque et al, 2021) is a citation of the Zenodo record, e.g.:

@software{matthew_bourque_2021_4556063,
  author       = {Matthew Bourque and
                  Néstor Espinoza and
                  Joseph Filippazzo and
                  Mees Fix and
                  Teagan King and
                  Catherine Martlin and
                  Jennifer Medina and
                  Natasha Batalha and
                  Michael Fox and
                  Jules Fowler and
                  Jonathan Fraine and
                  Matthew Hill and
                  Nikole Lewis and
                  Kevin Stevenson and
                  Jeff Valenti and
                  Hannah Wakeford},
  title        = {The Exoplanet Characterization Toolkit (ExoCTK)},
  month        = feb,
  year         = 2021,
  publisher    = {Zenodo},
  version      = {1.0.0},
  doi          = {10.5281/zenodo.4556063},
  url          = {https://doi.org/10.5281/zenodo.4556063}
}

Want to stay up-to-date with our releases and updates?

Subscribe to our newsletter by sending an email with a blank body and subject to exoctk-news-subscribe-request@maillist.stsci.edu from the email you want to enroll. You should then receive a confirmation email with instructions on how to confirm your subscription, please be sure to do so within 48 hours.

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The following attestation bundles were made for exoctk-2026.7.tar.gz:

Publisher: build.yml on ExoCTK/exoctk

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Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
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Source repository:
- Permalink: ExoCTK/exoctk@35044cbe462c9828c7c5f9578c25e2b2978bc610
- Branch / Tag: refs/tags/v2026.7.1
- Owner: https://github.com/ExoCTK
- Access: public
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- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: build.yml@35044cbe462c9828c7c5f9578c25e2b2978bc610
- Trigger Event: release

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Uploaded using Trusted Publishing? Yes
Uploaded via: twine/7.0.0 CPython/3.13.14

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The following attestation bundles were made for exoctk-2026.7-py3-none-any.whl:

Publisher: build.yml on ExoCTK/exoctk

Attestations: Values shown here reflect the state when the release was signed and may no longer be current.

Statement:
- Statement type: https://in-toto.io/Statement/v1
- Predicate type: https://docs.pypi.org/attestations/publish/v1
- Subject name: exoctk-2026.7-py3-none-any.whl
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- Sigstore transparency entry: 2424710570
- Sigstore integration time: Aug 11, 2026
Source repository:
- Permalink: ExoCTK/exoctk@35044cbe462c9828c7c5f9578c25e2b2978bc610
- Branch / Tag: refs/tags/v2026.7.1
- Owner: https://github.com/ExoCTK
- Access: public
Publication detail:
- Token Issuer: https://token.actions.githubusercontent.com
- Runner Environment: github-hosted
- Publication workflow: build.yml@35044cbe462c9828c7c5f9578c25e2b2978bc610
- Trigger Event: release

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2026.7 This release

Aug 11, 2026 2 files

Dec 5, 2024 2 files

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Nov 17, 2018 1 file

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exoctk 2026.7

Introduction

Installation

Download Anaconda or Miniconda

Obtain the exoctk Package

Environment Installation

Package Installation From Source

Obtain the exoctk Data

Missing Dependencies?

Citation

Want to stay up-to-date with our releases and updates?

Project links

Key dates

6 maintainers

Credits

GitHub Statistics

Requires

Provides Extra

Tags

Classifiers

Download files

Source Distribution

Built Distribution

File details

File metadata

File hashes

Provenance

File details

File metadata

File hashes

Provenance

Release history Release notifications | RSS feed