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Proceedings Paper

Advanced speckle sensing for internal coronagraphs
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Paper Abstract

A 4-8m diameter telescope carrying a coronagraph instrument is a leading candidate for an anticipated flagship mission to detect and characterize Earth-size exoplanets in the 2020s.1 Many candidate coronagraph instruments have been proposed, and one is close to meeting some of the principal requirements for that mission. But the telescope and instrument will need exquisite stability and precise control of the incoming wavefront to enable detection of faint companions (10-10of the star) at an angular separation of 2-4 Airy radii. In particular, wavefront errors cause speckles in the image, and variations in those speckles can confound the exoplanet detection. This challenge is compounded by the background light from zodiacal dust around our Sun and the target star, which limits the speed with which we can estimate and correct the speckles. We are working on developing coherent speckle detection techniques that will allow rapid calibration of speckles on the science detector, allowing subtraction in post-processing or correction with deformable mirrors. The expected speed improvement allows a much quicker timeline for measurement & calibration, which reduces the required telescope stability requirement and eases both the flight system design and the challenge of ground testing. We will describe the experiments and summarize progress to date.

Paper Details

Date Published: 15 September 2011
PDF: 8 pages
Proc. SPIE 8151, Techniques and Instrumentation for Detection of Exoplanets V, 81510I (15 September 2011); doi: 10.1117/12.895544
Show Author Affiliations
Charley Noecker, Ball Aerospace & Technologies Corp. (United States)
Stuart Shaklan, Jet Propulsion Lab. (United States)
James K. Wallace, Jet Propulsion Lab. (United States)
Brian Kern, Jet Propulsion Lab. (United States)
Amir Give'on, Jet Propulsion Lab. (United States)
Jeremy Kasdin, Princeton Univ. (United States)
Ruslan Belikov, NASA Ames Research Ctr. (United States)
Steve Kendrick, Ball Aerospace & Technologies Corp. (United States)


Published in SPIE Proceedings Vol. 8151:
Techniques and Instrumentation for Detection of Exoplanets V
Stuart Shaklan, Editor(s)

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