Helium is the second-most abundant element in the Universe after hydrogen and is one of
the main constituents of gas-giant planets in our Solar System. Early theoretical models …

Giant exoplanets orbiting close to their host stars have high temperatures because of the
immense amount of stellar irradiation that they receive. The extreme energy input leads to …

We present the discovery and characterization of two transiting planets observed by TESS in
the light curves of the young and bright (V= 9.67) star HD73583 (TOI-560). We perform an …

KELT-9 b, the hottest known exoplanet, with T eq~ 4400 K, is the archetype of a new planet
class known as ultra-hot Jupiters. These exoplanets are presumed to have an atmosphere …

WASP-52b is a low-density hot Jupiter orbiting a moderately active K2V star. Previous low-
resolution studies have revealed a cloudy atmosphere and found atomic Na above the cloud …

We present a spectrally and temporally resolved detection of the optical Mg i triplet at 7.8σ in
the extended atmosphere of the ultra-hot Jupiter KELT-9 b, adding to the list of detected …

Ultra-hot Jupiters (UHJs) are highly irradiated giant exoplanets with extremely high day-side
temperatures, which lead to thermal dissociation of most molecular species. It is expected …

Escaping atmosphere has been detected by the excess absorption of Lyα, Hα and He triplet
(λ10830) lines. Simultaneously modeling the absorption of the Hα and He λ10830 lines can …

A 3D fully self-consistent multifluid hydrodynamic aeronomy model is applied to simulate the
hydrogen-helium expanding upper atmosphere of the hot Jupiter HD189733b, and related …

We have obtained> 10 hr of medium-resolution (R∼ 15,000) spectroscopic exposures on
the transiting exoplanet host star WASP-12, including∼ 2 hr while its planet, WASP-12b, is …