SELSIS , Franck

In an atmosphere, a cloud condensation region is characterized by a strong vertical gradient in the abundance of the related condensing species. On Earth, the ensuing gradient of mean molecular weight has relatively few dynamical consequences because N2 is heavier than water vapor, so that only the release of latent heat significantly impacts...

During the last few years, observations have yielded an abundant population of short-period planets under 15 Earth masses. Among those, hot terrestrial exoplanets represent a key population to study the survival of dense atmospheres close to their parent star. Thermal emission from exoplanets orbiting low-mass stars will be observable with the...

Astron. & Astrophys., 476, pp. 1005-1018 (2007)

Hot Jupiters (HJs) are very good targets for transmission spectroscopy analysis. Their atmospheres have a large scale height, implying a high signal-to-noise ratio. As these planets orbit close to their stars, they often present strong thermal and chemical heterogeneities between the day- and nightside of their atmosphere. For the hottest of...

Short period (<50 days) low-mass (<10Mearth) exoplanets are abundant and the few of them whose radius and mass have been measured already reveal a diversity in composition. Some of these exoplanets are found on eccentric orbits and are subjected to strong tides affecting their rotation and resulting in significant tidal heating. Within this...

The photometric signal we receive from a star hosting a planet is modulated by the variation of the planet signal with its orbital phase. Already observed for giant exoplanets, those thermal phase curves should be measured with future telescopes (JWST and EChO) for hot rocky Super-Earths in transiting and nontransiting configurations. The...

The presence of biomarker molecules in the atmospheres of terrestrial planets is usually interpreted within the context of biological activity. The instrumental design requirements for the detection of such species are demanding because of the weak signals. In this contribution we present contrast spectra of super-Earth planets.

Context. Stellar activity and convection-related surface structures might cause bias in planet detection and characterization that use these transits. Surface convection simulations help to quantify the granulation signal.Aims. We used realistic three-dimensional (3D) radiative hydrodynamical (RHD) simulations from the Stagger grid and...

Not Available

A new family of planets is considered which is between rochy terrestrial planets and gaseous giant ones: Öcean-Planets\". We present the possible formation, composition and internal models of these putative planets, including that of their ocean, as well as their possible Exobiology interest. These planets should be detectable by planet...

International audience