Speaker
Description
High-resolution (HR) ground-based spectrographs have drastically improved the investigation of exoplanet atmospheres.
We will present results obtained within the GAPS 2.0 long-term program for atmospheric characterization of hot giant planets using the near-infrared 0.95-2.45 \mu m) arm of GIARPS: the high-resolution (R /sim 50 000) spectrograph GIANO-B of the Telescopio Nazionale Galileo (TNG).
We will particularly focus on our ongoing efforts to probe exoplanetary atmospheres with the transmission spectroscopy technique. With the detection of six molecules in the atmosphere of the hot-Jupiter HD 209458b (Giacobbe+2021), we have demonstrated that exoplanetary atmospheres can show a chemical richness previously unknown. Here, we will present the atmospheric characterization of three warm planets, namely the super-Neptune WASP-107b (Giacobbe+ in prep.), the sub-Saturn WASP-69b (Guilluy+2022, accepted), and the sub-Jovian WASP-80b (Carleo+2022, accepted). The simultaneous detection of multiple molecules in their atmospheres reinforces our previous finding revealing a rich atmospheric composition also for warm giant planets. We will give an interpretation of our results in terms of the planet’s C/O ratio and metallicity, which allow us to derive important clues on the formation and migration histories. These analyses represent a new frontier in the characterization of exoplanetary atmospheres, and additional surprising discoveries are expected in the next future with both ground-based HR spectrographs, such as CRIRES+, SPIRou, and NIRPS, and the low-resolution (LR) spectrographs on board the JWST telescope.
