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After about 01:30 in the NASA video NASA's Nancy Grace Roman Space Telescope: Broadening Our Cosmic Horizons the narrator says:

To deepen its study of exoplanets the Roman Space Telescope will house a beyond-state-of-the-art chronograph, that will directly image and analyze Neptune-size planets in orbits slightly larger than Earth’s.

The video shows a diagonal mirror with an articulated phase shifting surface followed by some kind of what I am guessing is a pupil filter.

Questions:

  1. What is this particular coronagraph or its design called, and where can I read in detail about how it works? Please feel free to add a short summary in the answer if so inclined.
  2. What is it about the design that would be considered "beyond-state-of-the-art"?

screen shot from NASA's Nancy Grace Roman Space Telescope: Broadening Our Cosmic Horizons

screen shot from NASA's Nancy Grace Roman Space Telescope: Broadening Our Cosmic Horizons

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    $\begingroup$ I'm sure Q2 is just journalistic nonsense. If it is beyond state-of-the-art, then it can't be built. It probably just means state-of-the-art. $\endgroup$ – ProfRob May 21 '20 at 9:26
  • $\begingroup$ @RobJeffries I'd assumed so; answers to What is it about the design that would be considered "merely-state-of-the-art"? would be welcomed as well. $\endgroup$ – uhoh May 21 '20 at 9:33

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