Séminaire Exoplanètes / |
| « An atmosphere on TRAPPIST-1b ? A GCM exploration of atmospheres compatible with the JWST eclipse observations » |
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Alice Maurel |
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JWST observations of the secondary eclipse of TRAPPIST-1b at 15 and 12.8 microns have shown a very bright dayside. Although this is consistent with a bare-rock scenario, and excludes a thick, CO2-rich atmosphere, we did not have enough knowledge to exclude any possibility of an atmosphere. A full phasecurve of the planet has been observed more recently, allowing for more information on the 3D thermal structure of the planet.
We explored different atmospheric cases to determine if some of them can produce a dayside emission and phascurve compatibles with the observations. We identified three different types of atmospheres that can produce a high dayside flux at the observed wavelengths. For each, we produced synthetic phasecurves and showed that the comparison with the observation should allow for a more definitive conclusion on the possibility of an atmosphere on this planet. |
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mardi 5 mars 2024 - 14:00 Salle des séminaires Évry Schatzman Institut d'Astrophysique de Paris |
| Page web du séminaire / Seminar's webpage |