منابع مشابه
On - sky observations with an achromatic hybrid phase knife coronagraph in the visible ( Research Note )
Context. The four-quadrant phase mask stellar coronagraph, introduced by D. Rouan et al., is capable of achieving very high dynamical range imaging and was studied in the context of the direct detection of extra-solar planets. Achromatic four-quadrant phase mask is currently being developed for broadband IR applications. Aims. We report on laboratory and on-sky tests of a prototype coronagraph ...
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We present a new phase mask coronagraph consisting in an optical vortex induced by a space-variant surface relief subwavelength grating. Phase mask coronagraphy is a recent technique aiming at accommodating both high dynamic and high angular resolution imaging of faint sources around bright objects such as exoplanets orbiting their parent stars or host galaxies of active galactic nuclei. Subwav...
متن کاملExtinction-controlled adaptive phase-mask coronagraph
Context. Phase-mask coronagraphy is advantageous in terms of inner working angle and discovery space. It is, however, still affected by drawbacks such as sensitivity to tip-tilt errors and chromatism. A nulling stellar coronagraph based on the adaptive phase-mask concept using polarization interferometry is presented in this paper. Aims. Our concept aims at dynamically and achromatically optimi...
متن کاملInstantaneous phase retrieval with the vector vortex coronagraph
1 60 rue des bergers, 75015 Paris, France e-mail: [email protected] 2 Université de Liège, 17 Allée du 6 Août, 4000 Sart Tilman, Belgium 3 European Southern Observatory, Alonso de Cordóva 3107, Vitacura, Santiago, Chile e-mail: [email protected] 4 NASA-Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109, USA 5 Techspace-Aero, route de Liers ...
متن کاملAn achromatic eight - octant phase - mask coronagraph using photonic crystal
For direct detection of faint exoplanets, high-contrast imagers would be indispensable for strongly suppressing central bright stars. In particular, extremely high contrast of 10−10 will be needed for detecting Earth-like planets. An eight-octant phase-mask (EOPM) coronagraph is one of promising concepts because of its high-contrast performance, small inner working angle, and simple optical con...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2003
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20021834