Contributions > By speaker > Guillot Tristan

The discovery of transiting planets with effective temperatures lower than about 500K is an opportunity to test our understanding of atmospheric dynamics: At these temperatures, several crucial species including water condense. In hydrogen atmospheres, at high-enough metallicity, moist convection is inhibited, a phenomenon linked to the fact that latent heat release maintains a higher concentration of high molecular weight vapor in raising plumes than in the environment. The process, which should lead to a potentially much warmer interior, is still poorly understood. The discovery of a statistically-significant number of long-period transiting planets and the characterization of their atmosphere offers new opportunities by measuring the abundances of disequilibrium species. Prior to that, identifying these planets is crucial. I will show how the observation of solar system planets such as Jupiter and Saturn with Juno and Cassini, the identification of new long-period transiting planets from Antarctica with ASTEP and the future launch of PLATO should help to make decisive progress in this domain.