The field of exoplanet atmospheric characterization has recently made considerable
advances with the advent of high-resolution spectroscopy from large ground-based …

The radius valley (or gap) in the observed distribution of exoplanet radii, which separates
smaller super-Earths from larger sub-Neptunes, is a key feature that theoretical models must …

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 …

The metastable helium triplet in the near-infrared (10 833 Å) is among the most important
probes of exoplanet atmospheres. It can trace their extended outer layers and constrain …

Characterisation of atmospheres undergoing photo-evaporation is key to understanding the
formation, evolution, and diversity of planets. However, only a few upper atmospheres that …

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 …

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 …

Studying the esca** atmospheres of highly irradiated exoplanets is critical for
understanding the physical mechanisms that shape the demographics of close-in planets. A …

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 …

We announce the detection of esca** helium from TOI 2134b, a mini-Neptune a few
gigayears old. The average in-transit absorption spectrum shows a peak of 0.37%±0.05 …