Exoplanets in the ultra-hot Jupiter regime provide an excellent laboratory for testing the
impact of stellar irradiation on the dynamics and chemical composition of gas giant …

Context. General circulation models of gas giant exoplanets predict equatorial jets that drive
inhomogeneities in the atmospheric physical parameters across the planetary surface. Aims …

Studying the atmospheres of exoplanets is one of the most promising ways to learn about
distant worlds beyond our solar system. The composition of an exoplanet's atmosphere can …

Context. The new generation of observatories and instruments (VLT/ERIS, JWST, ELT)
motivate the development of robust methods to detect and characterise faint and close-in …

Context. The advent of high-contrast imaging instruments combined with medium-resolution
spectrographs allows spectral and temporal dimensions to be combined with spatial …

Context. The extreme temperature gradients from day-to nightside in the atmospheres of hot
Jupiters generate fast winds in the form of equatorial jets or day-to-night flows. Observations …

Ultra-hot Jupiters, an extreme class of planets not found in our solar system, provide a
unique window into atmospheric processes. The extreme temperature contrasts between …

Transmission spectroscopy is a prime method to study the atmospheres of extrasolar
planets. We obtained a high-resolution spectral transit time series of the hot Jupiter WASP …

Transit spectroscopy usually relies on the integration of one or several transits to achieve the
signal-to-noise ratio (S/N) necessary to resolve spectral features. Consequently, high-S/N …

The neutral sodium resonance doublet (Na ID) has been detected in the upper atmosphere
of several close-in gas giants, through high-resolution transmission spectroscopy. We aim to …