7 July 2008 Prototyping coronagraphs for exoplanet characterization with SPHERE
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Abstract
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 microns. This requirements is extremely critical for coronagraphy. This paper briefly introduces the concepts of 2 coronagraphs, the Half-Wave Plate Four Quadrant Phase Masks and the Apodized Pupil Lyot Coronagraph, prototyped within the SPHERE consortium by LESIA (Observatory of Paris) and FIZEAU (University of Nice) respectively. Then, we present the measurements of contrast and sensitivity analysis. The comparison with technical specifications allows to validate the technology for manufacturing these coronagraphs.
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Anthony Boccaletti, Anthony Boccaletti, Lyu Abe, Lyu Abe, Jacques Baudrand, Jacques Baudrand, Jean-Baptiste Daban, Jean-Baptiste Daban, Richard Douet, Richard Douet, Geraldine Guerri, Geraldine Guerri, Sylvie Robbe-Dubois, Sylvie Robbe-Dubois, Philippe Bendjoya, Philippe Bendjoya, Kjetil Dohlen, Kjetil Dohlen, Dimitri Mawet, Dimitri Mawet, } "Prototyping coronagraphs for exoplanet characterization with SPHERE", Proc. SPIE 7015, Adaptive Optics Systems, 70151B (7 July 2008); doi: 10.1117/12.789341; https://doi.org/10.1117/12.789341
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