Reliability of 1D radiative-convective photochemical-equilibrium retrievals on transit spectra of WASP-107b Article Swipe
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· 2025
· Open Access
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· DOI: https://doi.org/10.1051/0004-6361/202554885
Context . WASP-107b has been observed in unprecedented detail with the James Webb Space Telescope. These observations suggest that it has a metal-rich and carbon-deprived atmosphere with an extremely hot interior based on detections of SO 2 , H 2 O, CO 2 , CO, NH 3 , and CH 4 . Aims . In this paper, we aim to determine the reliability of a 1D radiative-convective photochemical-equilibrium (1D-RCPE) retrieval method in inferring atmospheric properties of WASP-107b. We aim to explore its sensitivity to modelling assumptions and different cloud parametrizations, and investigate the data information content. Additionally, we aim to characterize chemical trends and map dominant pathways to develop a comprehensive understanding of the 1D-RCPE model grid before running the retrievals. Methods . We built a grid of radiative-convective balanced pressure-temperature profiles and 1D photochemical equilibrated models, which cover a range of metallicities (Z), carbon-to-oxygen ratios (C/O), intrinsic temperatures (T int ), and eddy diffusion coefficients (K zz ). We adopted a nested sampling algorithm within a Bayesian framework to estimate model parameters from previously analysed transit observations of WASP-107b discontinuously covering 1.1–12.2 μm. Results . Our model grid reproduces established chemical trends such as the dependence of SO 2 production on metallicity and demonstrates that mixing-induced quenching at high T int reduces the bulk CH 4 and NH 3 content. We obtain good fits with our 1D-RCPE retrievals that are mostly based on a few molecular features of H 2 O, CO 2 , SO 2 , and CH 4 , but find no substantial contribution of NH 3 . We find that the degeneracy between metallicity, cloud pressure, and a model offset is broken by the presence of strong SO 2 features, confirming that SO 2 is a robust metallicity indicator. We systematically retrieve sub-solar C/O based on the relative amplitude of a strong CO 2 feature with respect to the broad band of H 2 O, which is sensitive to a wavelength-dependent scattering slope. We find that high-altitude clouds obscure the CH 4 −rich layers, preventing the retrievals from constraining T int , but that higher values of K zz can transport material above the cloud deck, allowing a fit of the CH 4 feature. However, T int and K zz can vary substantially between retrievals depending on the adopted cloud parametrization. Conclusions . We conclude that the 1D-RCPE retrieval method can provide useful insights if the underlying grid of forward models is well understood. We find that WASP-107b’s atmosphere is enriched in metals (3–5 Z ⊙ ) and carbon-deprived (C/O ≲ 0.20). However, we lack robust constraints on the intrinsic temperature and vertical mixing strength.
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- article
- Language
- en
- Landing Page
- https://doi.org/10.1051/0004-6361/202554885
- OA Status
- hybrid
- References
- 157
- Related Works
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https://openalex.org/W4412940048Canonical identifier for this work in OpenAlex
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https://doi.org/10.1051/0004-6361/202554885Digital Object Identifier
- Title
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Reliability of 1D radiative-convective photochemical-equilibrium retrievals on transit spectra of WASP-107bWork title
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articleOpenAlex work type
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enPrimary language
- Publication year
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2025Year of publication
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2025-08-04Full publication date if available
- Authors
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T. Konings, Lars Heinke, Robin Baeyens, Kaustubh Hakim, Valentin Christiaens, L. DecinList of authors in order
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https://doi.org/10.1051/0004-6361/202554885Publisher landing page
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YesWhether a free full text is available
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hybridOpen access status per OpenAlex
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https://doi.org/10.1051/0004-6361/202554885Direct OA link when available
- Concepts
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Physics, Radiative transfer, Astrophysics, Transit (satellite), Spectral line, Convection, Reliability (semiconductor), Radiative equilibrium, Astronomy, Mechanics, Optics, Thermodynamics, Public transport, Political science, Law, Power (physics)Top concepts (fields/topics) attached by OpenAlex
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10Other works algorithmically related by OpenAlex
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| abstract_inverted_index.equilibrated | 135 |
| abstract_inverted_index.metallicity, | 267 |
| abstract_inverted_index.observations | 16, 177 |
| abstract_inverted_index.temperatures | 148 |
| abstract_inverted_index.Additionally, | 96 |
| abstract_inverted_index.WASP-107b’s | 411 |
| abstract_inverted_index.comprehensive | 110 |
| abstract_inverted_index.high-altitude | 330 |
| abstract_inverted_index.metallicities | 142 |
| abstract_inverted_index.photochemical | 134 |
| abstract_inverted_index.substantially | 376 |
| abstract_inverted_index.understanding | 111 |
| abstract_inverted_index.unprecedented | 7 |
| abstract_inverted_index.mixing-induced | 206 |
| abstract_inverted_index.systematically | 294 |
| abstract_inverted_index.carbon-deprived | 24, 422 |
| abstract_inverted_index.discontinuously | 180 |
| abstract_inverted_index.carbon-to-oxygen | 144 |
| abstract_inverted_index.parametrization. | 384 |
| abstract_inverted_index.parametrizations, | 89 |
| abstract_inverted_index.pressure-temperature | 130 |
| abstract_inverted_index.radiative-convective | 66, 128 |
| abstract_inverted_index.wavelength-dependent | 324 |
| abstract_inverted_index.photochemical-equilibrium | 67 |
| cited_by_percentile_year | |
| countries_distinct_count | 4 |
| institutions_distinct_count | 6 |
| citation_normalized_percentile.value | 0.33225178 |
| citation_normalized_percentile.is_in_top_1_percent | False |
| citation_normalized_percentile.is_in_top_10_percent | False |