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

The population of small, close-in exoplanets is bifurcated into super-Earths and sub-
Neptunes. We calculate physically motivated mass–radius relations for sub-Neptunes, with …

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 …

We present the detection of neutral helium at 10833 Å in the atmosphere of WASP-52b and
tentative evidence of helium in the atmosphere of the grazing WASP-177b, using high …

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 …

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

Context. Because of its proximity to an active K-type star, the hot Jupiter WASP-80b has
been identified as a possible excellent target for detecting and measuring He I absorption in …

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 …

Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary
formation and evolution. We present the discovery of HD 63433 d—a nearby (22 pc), Earth …

We report a search for excess absorption in the 1083.2 nm line of ortho (triplet) helium
during transits of TOI-1807b and TOI-2076b, 1.25 and 2.5-R⊕ planets on 0.55-and 10.4-d …