L'exoplanétologie est un domaine très actif de l'astronomie moderne avec des questions
encore ouvertes: comment les systèmes planétaires se forment-ils et évoluent-ils; pourquoi …

Coronagraphy is a very promising method for directly imaging exoplanets, but the
performance of a coronagraph is highly sensitive to quasi-static aberrations within the …

Context. Fewer than 1% of all exoplanets detected to date have been characterized on the
basis of spectroscopic observations of their atmosphere. Unlike indirect methods, high …

The Optimal Optical Coronagraph (OOC) Workshop held at the Lorentz Center in September
2017 in Leiden, the Netherlands, gathered a diverse group of 25 researchers working on …

High-contrast imaging and spectroscopy provide unique constraints for exoplanet formation
models as well as for planetary atmosphere models. Instrumentation techniques in this field …

Context. In the context of direct imaging of exoplanets, coronagraphs are commonly
proposed to reach the required very high contrast levels. However, wavefront aberrations …

Future searches for bio-markers on habitable exoplanets will rely on telescope instruments
that achieve extremely high contrast at small planet-to-star angular separations …

Future planned space telescopes, such as the IR/O/UV Large Telescope, recommended by
Astro2020 will be used to directly image exo-Earths. They will employ high-order wavefront …

Context. Spectroscopy of exoplanets is very challenging because of the high star-planet
contrast. A technical difficulty in the design of imaging instruments is the noncommon path …

Context. The two main advantages of exoplanet imaging are the discovery of objects in the
outer part of stellar systems, which constrains the models of planet formation, and its ability …