Breaking degeneracies in exoplanetary parameters through self-consistent atmosphere-interior modelling - Archive ouverte HAL
Article Dans Une Revue Astronomy & Astrophysics - A&A Année : 2024

Breaking degeneracies in exoplanetary parameters through self-consistent atmosphere-interior modelling

Résumé

Context: A new generation of instruments (e.g., JWST, ELTs, PLATO, Ariel) is providing atmospheric spectra and mass/radius measurements for large exoplanet populations, challenging planetary models used to interpret these findings. Aims: We develop a new model, the Heat Atmosphere Density Evolution Solver (HADES), by coupling an atmosphere and interior model self-consistently and comparing its results to observed data. Methods: Atmospheric calculations are performed under radiative-convective equilibrium, while the interior relies on recent ab initio equations of state. We ensure continuity in the thermal, gravity, and molecular mass profiles between models. Results: The model is applied to the known exoplanet database to characterize intrinsic thermal properties. We find that intrinsic temperatures (T$_{int}$) of 200-400 K, increasing with equilibrium temperature, are needed to explain radius inflation in hot Jupiters. Additionally, we perform atmosphere-interior retrievals using observed spectra and measured parameters for WASP-39 b and 51 Eridani b. For WASP-39 b, spectroscopic data breaks degeneracies in metallicity and Tint, deriving high values: Z = 14.79$^{+1.80}_{-1.91}$ x Solar and T$_{int} = 297.39^{+8.95}_{-16.9}$ K. For 51 Eridani b, we show the importance of using self-consistent models with radius as a constrained parameter, deriving a planet mass M$_{p} = 3.13^{+0.05}_{-0.04}$ M$_{J}$ and a core mass M$_{core} = 31.86^{+0.32}_{-0.18}$ M$_{E}$, suggesting formation via core accretion with a "hot start." Conclusions: Self-consistent atmosphere-interior models can efficiently break degeneracies in the structure of transiting and directly imaged exoplanets, offering new insights into exoplanet formation and evolution.
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Dates et versions

hal-04824926 , version 1 (23-10-2024)
hal-04824926 , version 2 (07-12-2024)

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Christian Wilkinson, Benjamin Charnay, Stéphane Mazevet, Anne-Marie Lagrange, Antoine Chomez, et al.. Breaking degeneracies in exoplanetary parameters through self-consistent atmosphere-interior modelling. Astronomy & Astrophysics - A&A, In press, ⟨10.48550/arXiv.2410.04470⟩. ⟨hal-04824926v1⟩
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