Presenter: Enric PALLE
Abstract:
Transmission spectroscopy using high-resolution spectrographs is quickly becoming a major tool to detect and understand planetary atmospheres, from ultra hot Jupiters to Neptunes-size planets. The CARMENES spectrograph started operations in 2016, and since then we have been using it for the study of planetary atmospheres taking advantage of it simultaneous wavelength coverage from visible to near-infrared (0.5-1.7 micron). This has led to several innovative results, including the first ground-based detections of the He I triplet, allowing the study of exoplanetary tails and scape ratios, or the detection for the first time of the Ca triplet (together with FeII, Na I, and the Balmer series of Hα, Hβ, and Hγ) in the atmosphere of the ultra hot Jupiter (UHJs) MASCARA-2b/KELT20-b. In this talk we will update the several He detections on a sample of about a dozen planets, including various levels of stellar irradiation and planetary masses, and discuss CARMENES’s capabilities for the characterization of UHJs atmospheres, where our results are consistent with theoretical models, predicting a rich ionosphere on the day-side of these planets. I will finally mention the future expected contributions of ESPRESSO and HIRES to this field.