Astrophysical measurements have shown that some stars have sufficiently high carbon-to-oxygen ratios such that the planets they host would be mainly composed of carbides instead of silicates. We studied the […]
exoplanet
Posted inExoplanets, -moons, -comets, Press Release
Alkaline Exospheres of Exoplanet Systems: Evaporative Transmission Spectra
Hydrostatic equilibrium is an excellent approximation for the dense layers of planetary atmospheres where it has been canonically used to interpret transmission spectra of exoplanets. Here we exploit the ability […]
Posted inExoplanets, -moons, -comets, Press Release
Toward Complete Characterization: Prospects for Directly Imaging Transiting Exoplanets
High contrast direct imaging of exoplanets can provide many important observables, including measurements of the orbit, spectra that probe the lower layers of the atmosphere, and phase variations of the […]
Posted inExoplanets, -moons, -comets, Press Release
Ions in the Thermosphere of Exoplanets: Observable Constraints Revealed by Innovative Laboratory Experiments
With the upcoming launch of space telescopes dedicated to the study of exoplanets, the Atmospheric Remote-Sensing Infrared Exoplanet Large-survey (ARIEL) and the James Webb Space Telescope (JWST), a new era […]
Posted inExoplanets, -moons, -comets, Press Release
Radial-velocity Variations Due To Meridional Flows In The Sun And Solar-type Stars: Impact On Exoplanet Detectability
Stellar variability due to magnetic activity and flows at different spatial scales strongly impacts radial velocities. This variability is seen as oscillations, granulation, supergranulation, and meridional flows. The effect of […]
Posted inExoplanets, -moons, -comets, Press Release
TOI-1338: TESS' First Transiting Circumbinary Planet
We report the detection of the first circumbinary planet found by TESS. The target, a known eclipsing binary, was observed in sectors 1 through 12 at 30-minute cadence and in […]
Posted inAstrogeology, Atmospheres, Climate, Weather, Exoplanets, -moons, -comets, Press Release, Proxima Centauri
Atmospheric Convection Plays A Key Role In The Climate Of Tidally-locked Terrestrial Exoplanets: Insights From High-resolution Simulations
Using a 3D general circulation model (GCM), we investigate the sensitivity of the climate of tidally-locked Earth-like exoplanets, Trappist-1e and Proxima Centauri b, to the choice of a convection parameterization. […]
Posted inExoplanets, -moons, -comets, Press Release
Sulfur-driven Haze Formation in Warm CO2-rich Exoplanet Atmospheres
Sulfur gases significantly affect the photochemistry of planetary atmospheres in our Solar System, and are expected to be important components in exoplanet atmospheres. However, sulfur photochemistry in the context of […]
Posted inExoplanets, -moons, -comets, Press Release
Outstanding Challenges of Exoplanet Atmospheric Retrievals
Spectral retrieval has long been a powerful tool for interpreting planetary remote sensing observations. Flexible, parameterised, agnostic models are coupled with inversion algorithms in order to infer atmospheric properties directly […]
Posted inExoplanets, -moons, -comets, Press Release
Stellar Driven Evolution of Hydrogen-Dominated Atmospheres from Earth-Like to Super-Earth-Type Exoplanets
In the present chapter we present the results of evolutionary studies of exoplanetary atmospheres. We mostly focus on the sub- to super-Earth domain, although these methods are applicable to all […]