Eighth-Order Image Masks for Terrestrial Planet Finding

Details Eighth-Order Image Masks for Terrestrial Planet Finding Eighth-Order Image Masks for Terrestrial Planet Finding

2004-11-03

arxiv.org/abs/astro-ph/0411077v2

Astronomy and Astrophysics

Astrophysics

21 pages, including 6 figures. Accepted to ApJ

Scientific paper

10.1086/430200

We describe a new series of band-limited image masks for coronagraphy that are insensitive to pointing errors and other low-spatial-frequency optical aberrations. For a modest cost in throughput, these ``eighth-order'' masks would allow the Terrestrial Planet Finder Coronagraph (TPF-C) to operate with a pointing accuracy no better than that of the Hubble Space Telescope. We also provide eighth-order notch filter masks that offer the same robustness to pointing errors combined with more manageable construction tolerances: binary masks and graded masks with moderate optical density requirements.

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