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• W3206114138 abstract "Abstract Spectroscopic eclipse observations, like those possible with the James Webb Space Telescope, should enable 3D mapping of exoplanet day sides. However, fully flexible 3D planet models are overly complex for the data and computationally infeasible for data-fitting purposes. Here, we present ThERESA, a method to retrieve the 3D thermal structure of an exoplanet from eclipse observations by first retrieving 2D thermal maps at each wavelength and then placing them vertically in the atmosphere. This approach allows the 3D model to include complex thermal structures with a manageable number of parameters, hastening fit convergence and limiting overfitting. An analysis runs in a matter of days. We enforce consistency of the 3D model by comparing the vertical placement of the 2D maps with their corresponding contribution functions. To test this approach, we generated a synthetic JWST NIRISS-like observation of a single hot-Jupiter eclipse using a global circulation model of WASP-76b and retrieved its 3D thermal structure. We find that a model that places the 2D maps at different depths depending on latitude and longitude is preferred over a model with a single pressure for each 2D map, indicating that ThERESA is able to retrieve 3D atmospheric structure from JWST observations. We successfully recover the temperatures of the planet’s day side, the eastward shift of its hot spot, and the thermal inversion. ThERESA is open source and publicly available as a tool for the community." @default.
• W3206114138 created "2021-10-25" @default.
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• W3206114138 date "2022-02-08" @default.
• W3206114138 modified "2023-10-14" @default.
• W3206114138 title "ThERESA: Three-dimensional Eclipse Mapping with Application to Synthetic JWST Data" @default.
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• W3206114138 doi "https://doi.org/10.3847/1538-3881/ac4885" @default.
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