GUERRI , Géraldine

Since 1995, with the confirmation of the detection of the first extra-solar planet, the direct detection and spectral characterization of an exo-planet became one of current astronomical challenges. However, the strong existing contrast between the star and the planet, 10^9 in the visible band and 10^6 in the thermal infrared band when it comes...

We report on the first daytime on-sky results of a Phase Knife stellar Coronagraph operated in the visible from the French-Italian Concordia station at Dome C of Antarctica. This site has proven in the last few years to offer excellent atmospheric seeing conditions for high spatial resolution observations. The coronagraphic performances...

The detection and characterization of extrasolar planets with SPHERE (Spectro Polarimetric High contrast Exoplanet REsearch) is challenging and in particular relies on the ability of a coronagraph to attenuate the diffracted starlight. SPHERE includes 3 instruments, 2 of which can be operated simultaneously in the near IR from 0.95 to 1.8...

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