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Proceedings Paper

Wavefront control methods for high-contrast integral field spectroscopy
Author(s): Tyler D. Groff; Camilo Mejia Prada; Eric Cady; Maxime J. Rizzo; Avi Mandell; Qian Gong; Michael McElwain; Neil Zimmerman; Prabal Saxena; Olivier Guyon
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Paper Abstract

Direct Imaging of exoplanets using a coronagraph has become a major field of research both on the ground and in space. Key to the science of direct imaging is the spectroscopic capabilities of the instrument, our ability to fit spectra, and understanding the composition of the observed planets. Direct imaging instruments generally use an integral field spectrograph (IFS), which encodes the spectrum into a two-dimensional image on the detector. This results in more efficient detection and characterization of targets, and the spectral information is critical to achieving detection limits below the speckle floor of the imager. The most mature application of these techniques is at more modest contrast ratios on ground-based telescopes, achieving approximately 5-6 orders of magnitude suppression. In space, where we are attempting to detect Earth-analogs, the contrast requirements are more severe and the IFS must be incorporated into the wavefront control loop to reach 1e-10 detection limits required for Earth-like planet detection. We present the objectives and application of IFS imagery for both a speckle control loop and post-processing of images. Results, tested methodologies, and the future work using the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS) and the Prototype Imaging Spectrograph for Coronagraphic Exoplanet Studies (PISCES) at the JPL High Contrast Imaging Testbed are presented.

Paper Details

Date Published: 1 September 2017
PDF: 7 pages
Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000Q (1 September 2017); doi: 10.1117/12.2274709
Show Author Affiliations
Tyler D. Groff, NASA Goddard Space Flight Ctr. (United States)
Camilo Mejia Prada, Jet Propulsion Lab. (United States)
Eric Cady, Jet Propulsion Lab. (United States)
Maxime J. Rizzo, NASA Goddard Space Flight Ctr. (United States)
Avi Mandell, NASA Goddard Space Flight Ctr. (United States)
Qian Gong, NASA Goddard Space Flight Ctr. (United States)
Michael McElwain, NASA Goddard Space Flight Ctr. (United States)
Neil Zimmerman, NASA Goddard Space Flight Ctr. (United States)
Prabal Saxena, NASA Goddard Space Flight Ctr. (United States)
Olivier Guyon, Subaru Telescope (United States)


Published in SPIE Proceedings Vol. 10400:
Techniques and Instrumentation for Detection of Exoplanets VIII
Stuart Shaklan, Editor(s)

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