منابع مشابه
Results from the adaptive optics coronagraph at the WHT
Described here is the design and commissioning of a coronagraph facility for the 4.2 metre William Herschel Telescope (WHT) and its Nasmyth Adaptive Optics system for Multi-purpose Instrumentation (NAOMI). The use of the NAOMI system gives an improved image resolution of ∼ 0.15 arcsecs at a wavelength of 2.2μm. This enables the Optimised Stellar Coronagraph for Adaptive optics (OSCA) to suppres...
متن کاملOptical vortex coronagraph.
We describe a method to observe dim exoplanets that eliminates light from the parent star across the entire exit pupil without sacrificing light from the planet by use of a vortex mask of topological charge m = 2.
متن کاملThe Achromatic Interfero Coronagraph
We report on the Achromatic Interfero Coronagraph, a focal imaging device which aims at rejecting the energy contribution of a point-like source set on-axis, so as to make detectable its angularly-close environment (applicable to stellar environment : circumstellar matter, faint companions, planetary systems, but also conceivably to Active Galatic Nucleii and multiple asteroids). With AIC, star...
متن کاملThe Pupil-swapping Coronagraph
A new coronagraph that performs destructive interference between copies of the telescope pupil in which “slices” have been swapped is studied in this paper. A fourth-order “pupil-swapping coronagraph” is particularly attractive for direct imaging of extrasolar terrestrial planets: it achieves 100% throughput at 1.4l/d on a square pupil (72.5% at 1.77 on a circular pupil), is compatible with a c...
متن کاملAnnular Groove Phase Mask Coronagraph
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...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1963
ISSN: 0004-6256
DOI: 10.1086/108970