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Atmospheric properties of AF Lep b with forward modeling by Palma-Bifani, P.; Chauvin, G.; Borja, D.; Bonnefoy, M.; Petrus, S.; Mesa, D.; De Rosa, R. J.; Gratton, R.; Baudoz, P.; Boccaletti, A.; Charnay, B.; Desgrange, C.; Tremblin, P.; Vigan, A. is a scholarly article available to read on EtoBox.

What is Atmospheric properties of AF Lep b with forward modeling about?

Aims. We aim to expand the atmospheric exploration of AF Lep b by modeling all available observations obtained with SPHERE at VLT (between 0.95-1.65, at 2.105, and 2.253 $\mu$m, and NIRC2 at Keck (at 3.8 $\mu$m) with self-consistent atmospheric models. Methods. To understand the physical properties of this exoplanet, we used ForMoSA. This forward-modeling code compares observations with grids of pre-computed synthetic atmospheric spectra using Bayesian inference methods. We used Exo-REM, an atmospheric radiative-convective equilibrium model, including the effects of non-equilibrium processes and clouds. Results. From the atmospheric modeling we derive solutions at a low effective temperature of ~750 K. Our analysis also favors a metal-rich atmosphere (>0.4) and solar to super-solar carbon-to-oxygen ratio (~0.6). We tested the robustness of the estimated values for each parameter by cross-validating our models using the leave-one-out strategy, where all points are used iteratively as validation points. Our results indicate that the photometry point at 3.8 $\mu$m strongly drives the metal-rich and super-solar carbon-to-oxygen solutions. Conclusions. Our atmospheric forward-modeling a

Author

Palma-Bifani, P.; Chauvin, G.; Borja, D.; Bonnefoy, M.; Petrus, S.; Mesa, D.; De Rosa, R. J.; Gratton, R.; Baudoz, P.; Boccaletti, A.; Charnay, B.; Desgrange, C.; Tremblin, P.; Vigan, A.

Published

2024

Language

EN