A Unified View of Coronagraph Image Masks

Details A Unified View of Coronagraph Image Masks A Unified View of Coronagraph Image Masks

2004-01-14

arxiv.org/abs/astro-ph/0401256v1

Astronomy and Astrophysics

Astrophysics

17 pages including 3 figures. Submitted to ApJ 1/13/04

Scientific paper

The last few years have seen a variety of new image mask designs for diffraction-limited coronagraphy. Could there still be useful designs as yet undiscovered? To begin to answer this question, I survey and unify the Fraunhofer theory of coronagraph image masks in the context of a one-dimensional classical coronagraph. I display a complete solution to the problem of removing on-axis light assuming an unapodized entrance aperture and I introduce the attenuation function, a measure of a generic coronagraph's off-axis performance. With these tools, I demonstrate that the masks proposed so far form a nearly complete library of image masks that are useful for detecting faint extrasolar planets.

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