Differential Imaging with a Multicolor Detector Assembly: A New ExoPlanet Finder Concept
نویسنده
چکیده
Simultaneous spectral differential imaging is a high contrast technique by which subtraction of simultaneous images reduces noise from atmospheric speckles and optical aberrations. Small non-common wave front errors between channels can seriously degrade its performance. We present a new concept, a multicolor detector assembly (MCDA), which can eliminate this problem. The device consists of an infrared detector and a microlens array onto the flat side of which a checkerboard pattern of narrow-band micro-filters is deposited, each micro-filter coinciding with a microlens. Practical considerations for successful implementation of the technique are mentioned. Numerical simulations predict a noise attenuation of 10 at 0.5 for a 10 seconds integration on a mH = 5 star of Strehl ratio 0.9 taken with an 8-m telescope. This reaches a contrast of 10 at an angular distance of 0.5 from the center of the star image. Subject headings: instrumentation: adaptive optics instrumentation: detectors planetary systems stars: imaging
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