Ariel Atmospheric Retrieval Challenge

Welcome to the Ariel Atmospheric Retrieval Challenge. The Ariel Space mission is a European Space Agency mission to be launched in 2028. Ariel will observe the atmospheres of 1000 extrasolar planets - planets around other stars - to determine how they are made, how they evolve and how to put our own Solar System in the gallactic context.

Atmospheric Retrievals

In preparation to the Ariel Red Book, we run this atmospheric retrieval challenge as a conduit to conduct forward model comparison as well as full retrieval comparison. The retrieval challenge will be run in 2 stages. The first stage will entail relatively simple model/retrieval comparisons. Stage 2 will entail a range of forward models in varying complexity. Each participant will be scored on the accuracy of their retrievals and their forward models. For more information see the about page.

The Prize!

Eternal gratitude ... or a bottle of wine.

Many thanks to...

Special thanks go to the Ariel retrieval working group and in particular, Jo Barstow, Quentin Changeat, Michiel Min and Ingo Waldmann. Also many thanks to the ExoAI team for helpful input and of course the Ariel team for technical and financial support and building the space mission in the first place!

Any questions or something gone wrong? Contact us at: exoai.ucl [at]

Ariel h2020 UKSA UCL