Mugnai, Lorenzo V.  ORCID: https://orcid.org/0000-0002-9007-9802, Yip, Kai Hou, Bocchieri, Andrea, Papageorgiou, Andreas, Batista, Virginie, Faucoz, Orphée, Syty, Angéle, Tahseen, Tara, Pascale, Enzo and Waldmann, Ingo
2026.
A public dataset of Ariel simulated observations for developing exoplanetary atmosphere data reduction pipelines.
RAS Techniques and Instruments
5
, rzag036.
10.1093/rasti/rzag036
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Abstract
Detecting and characterising exoplanet atmospheres remains challenging because atmospheric signals can be comparable to residual noise and instrumental/astrophysical systematics. Spectral features span from a few ppm for small planets up to ~103 ppm for warm/hot giants, while high-quality JWST time-series spectroscopy typically reaches ~10–50 ppm (occasionally ~100–200 ppm in the presence of stellar variability or stronger systematics), making correlated noise across temporal and spectral dimensions a key limitation. With JWST delivering an increasing volume of high-precision transmission spectra, and Ariel set to extend this to a homogeneous survey of ~103 exoplanet atmospheres, robust benchmarking resources with known ground truth are essential to develop and validate data-driven (including ML-based) detrending approaches. As a major step towards this goal, we use ExoSim2 and TauREx to generate one of the most comprehensive public datasets based on the current payload design of the ESA Ariel mission, specifically intended to benchmark detrending algorithms. We also provide a deep neural network baseline for time-series reduction, and use it to highlight the limitations of ML based detrendng methods, i.e. the risks posed by dataset shift when observed distributions diverge from those of the training set, a scenario likely to arise in real observations. This dataset is featured in the Ariel Data Challenge 2024 on Kaggle and has been field-tested for robustness and simulation fidelity. By making these resources publicly available, we aim to support the community in developing, comparing, and stress-testing scalable and reliable methods for exoplanet transmission spectroscopy.
| Item Type: | Article |
|---|---|
| Date Type: | Published Online |
| Status: | In Press |
| Schools: | Schools > Physics and Astronomy |
| Additional Information: | License information from Publisher: LICENSE 1: URL: https://creativecommons.org/licenses/by/4.0/, Start Date: 2026-05-08 |
| Publisher: | Oxford University Press |
| Date of First Compliant Deposit: | 18 May 2026 |
| Date of Acceptance: | 28 April 2026 |
| Last Modified: | 02 Sep 2026 14:05 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/187041 |
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