We use Keck/NIRSPEC to survey a sample of of young (< 1 Gyr), short-period mini-
Neptunes orbiting nearby K dwarfs to measure their mass loss via the metastable helium …

Context. The population of close-in exoplanets features a desert of hot Neptunes whose
origin remains uncertain. These planets may have lost their atmosphere, eroding into mini …

HD 235088 (TOI-1430) is a young star known to host a sub-Neptune-sized planet candidate.
We validated the planetary nature of HD 235088 b with multiband photometry, refined its …

Planetary magnetic fields can affect the predicted mass-loss rate for close-in planets that
experience large amounts of ultraviolet irradiation. In this work, we present a method to …

Aims. We aim to constrain the origin of the non-detection of the metastable He I triplet at≈
10 830 Å obtained for the hot Jupiter WASP-80b. Methods. We measure the X-ray flux of …

Hot Jupiters orbiting extremely close to their host star may experience atmospheric escape
due to the large amounts of high-energy radiation they receive. Understanding the …

During the first billion years of their life, exoplanet atmospheres are modified by different
atmospheric escape phenomena that can strongly affect the shape and morphology of the …

Context. The long-term Global Architecture of Planetary Systems (GAPS) programme has
been characterising a sample of young systems with transiting planets via spectroscopic and …

Young exoplanets trace planetary evolution, in particular the atmospheric mass loss that is
most dynamic in youth. However, the high activity level of young stars can mask or mimic the …

TOI-2076 b is a sub-Neptune-sized planet (R= 2.39±0.10 R⊕) that transits a young (204±50
MYr) bright (V= 9.2) K-dwarf hosting a system of three transiting planets. Using …