How clear are the skies of WASP-80b?: 3D Cloud feedback on the atmosphere and spectra of the warm Jupiter
Nishil Mehta, Vivien Parmentier, Xianyu Tan, Elspeth K. H. Lee, Tristan Guillot, Lindsey S. Wiser, Taylor J. Bell, Everett Schlawin, Kenneth Arnold, Sagnick Mukherjee, Thomas P. Greene, Thomas G. Beatty, Luis Welbanks, Michael R. Line, Matthew M. Murphy, Jonathan J. Fortney, Kazumasa Ohno
公開日: 2025/9/27
Abstract
Close-in warm Jupiters orbiting M-dwarf stars are expected to exhibit diverse atmospheric chemistry, with clouds playing a key role in shaping their albedo, heat distribution, and spectral properties. We study WASP-80b, a warm Jupiter orbiting an M-dwarf star, using the latest JWST panchromatic emission and transmission spectra to comprehensively characterize its atmosphere, including cloud coverage, chemical composition, and particle sizes, and compare the observations with predictions from general circulation models (GCMs). We use a General Circulation Model (GCM), ADAM (ADvanced Atmospheric MITgcm, formerly known as SPARC/MITgcm), combined with the latest JWST data to study the atmosphere of WASP-80b. A cloud module with radiatively active, tracer-based clouds is integrated with the GCM to study the effects on the atmosphere and the spectrum. Our results indicate that both emission and transmission spectra are well fit by cloudless GCMs. The data appear to be compatible with large cloud particles of any cloud species or KCl clouds of all particle sizes. The Na$_2$S condensates of radii 0.1 and 1 $\mu$m can be ruled out due to the strength of their radiative feedback. This showcases the unique insights that can be obtained from global modelling of exoplanet atmospheres.