Quasi Band-Limited Coronagraph for Extended Sources. (arXiv:2007.06785v2 [astro-ph.IM] UPDATED)

Quasi Band-Limited Coronagraph for Extended Sources. (arXiv:2007.06785v2 [astro-ph.IM] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Loutsenko_I/0/1/0/all/0/1">Igor Loutsenko</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yermolayeva_O/0/1/0/all/0/1">Oksana Yermolayeva</a>

We propose a class of graded coronagraphic “amplitude” image masks for a high
throughput Lyot-type coronagraph that transmits light from an annular region
around an extended source and suppresses light, with extremely high ratio, from
elsewhere. The interior radius of the region is comparable with its exterior
radius. The masks are designed using an idea inspired by approach due M.J.
Kuchner and W.A. Traub (“band-limited” masks) and approach to optimal
apodization by D.Slepian. One potential application of our masks is direct
high-resolution imaging of exo-planets with the help of the Solar Gravitational
Lens, where apparent radius of the “Einstein ring” image of a planet is of the
order of an arc-second and is comparable with the apparent radius of the sun
and solar corona.

Keywords: Coronagraphy, Optimal Band-Limiting, Exo-Planets, Solar
Gravitational Lens

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