Princeton University Extrasolar Planet Discussion Group

Ultrahot gas giants are exoplanet so close to their hot stars that they receive thousands of time the insolation of Earth. As such, they are extreme laboratories to study atmospheric physics, chemistry, and climates. They are also well amenable to remote sensing by space-borne and ground-based observations. Trying to learn more about the most extreme climates in the Universe, we could measure stellar dayside temperatures, nightside metallic rains, and atmospheric escape. We have also been using these outstanding exoplanets as trojan horses to benchmark characterization techniques that could eventually be applied to smaller, milder planets. I will discuss some of the results we obtained, in particular exploiting two novel instruments using high-resolution spectroscopy (ESPRESSO) and high-precision photometry (CHEOPS).