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Proceedings Paper

The low-order wavefront sensor for the PICTURE-C mission
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Paper Abstract

The PICTURE-C mission will fly a 60 cm off-axis unobscured telescope and two high-contrast coronagraphs in successive high-altitude balloon flights with the goal of directly imaging and spectrally characterizing visible scattered light from exozodiacal dust in the interior 1-10 AU of nearby exoplanetary systems. The first flight in 2017 will use a 10-4 visible nulling coronagraph (previously flown on the PICTURE sounding rocket) and the second flight in 2019 will use a 10-7 vector vortex coronagraph. A low-order wavefront corrector (LOWC) will be used in both flights to remove time-varying aberrations from the coronagraph wavefront. The LOWC actuator is a 76-channel high-stroke deformable mirror packaged on top of a tip-tilt stage. This paper will detail the selection of a complementary high-speed, low-order wavefront sensor (LOWFS) for the mission. The relative performance and feasibility of several LOWFS designs will be compared including the Shack-Hartmann, Lyot LOWFS, and the curvature sensor. To test the different sensors, a model of the time-varying wavefront is constructed using measured pointing data and inertial dynamics models to simulate optical alignment perturbations and surface deformation in the balloon environment.

Paper Details

Date Published: 16 September 2015
PDF: 12 pages
Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 960519 (16 September 2015); doi: 10.1117/12.2188238
Show Author Affiliations
Christopher B. Mendillo, Univ. of Massachusetts Lowell (United States)
Joshua Brown, Univ. of Massachusetts Lowell (United States)
Jason Martel, Univ. of Massachusetts Lowell (United States)
Glenn A. Howe, Univ. of Massachusetts Lowell (United States)
Kuravi Hewawasam, Univ. of Massachusetts Lowell (United States)
Susanna C. Finn, Univ. of Massachusetts Lowell (United States)
Timothy A. Cook, Univ. of Massachusetts Lowell (United States)
Supriya Chakrabarti, Univ. of Massachusetts Lowell (United States)
Ewan S. Douglas, Boston Univ. (United States)
Dimitri Mawet, California Institute of Technology (United States)
Olivier Guyon, National Astronomical Observatory of Japan (United States)
Garima Singh, National Astronomical Observatory of Japan (United States)
Julien Lozi, National Astronomical Observatory of Japan (United States)
Kerri L. Cahoy, Massachusetts Institute of Technology (United States)
Anne D. Marinan, Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 9605:
Techniques and Instrumentation for Detection of Exoplanets VII
Stuart Shaklan, Editor(s)

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