Скачать или смотреть Monika Strangret - Studies of atmospheres of ultra-hot jupiters

In recent years, the field of exoplanets is quickly evolving, concentrating not only on
the detection of new planets but also on the characterization of their atmospheres, through direct imaging and transmission/emission spectroscopy. With the advent of ultra-stable high-dispersion spectrographs, such as HARPS, HARPS-N, GIANO-B, CARMENES, ESPRESSO, and CRIRES+ new observing window opens for the characterization of exoplanet atmospheres, allowing us to overcome some of the intrinsic difficulties of observing through the Earth’s atmosphere. Thanks to the different Doppler velocities of the Earth, the host star, and the planet using high-resolution spectroscopy we are able to detect and characterize exoplanetary atmospheres. Additionally, in many cases, the signal is buried in the residual noise, however by performing a cross-correlation of atmospheric transmission models and hundreds of atmospheric lines the signal can be increased (1). Studying the atmospheres of ultra-hot Jupiters, objects with a temperature higher than 2200K (2) which orbit close to their host stars, gives us a great laboratory to study the chemistry of the exoplanets.

During my talk, I would like to present the complex analysis of the chemical composition of several ultra-hot Jupiters using high-resolution spectroscopic observations of transit with HARPS-N and HARPS spectrographs (3,4,5). By applying the transmission spectroscopic method (single lines and cross-correlation method), we looked for the signal of several atoms and molecules, paying special attention to the effects which could affect final detections or non-detections, such as the Rossiter-McLaughlin effect, center-to-limb variation, and/or pulsation of the star. Those effects show similar radial velocity changes as the expected signal coming from the atmosphere of the exoplanet. Therefore, precise modeling and corrections are extremely important, to avoid possible misinterpretation of the final detections.