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Simulating the WFIRST coronagraph integral field spectrograph
Author(s): Maxime J. Rizzo; Tyler D. Groff; Neil T. Zimmermann; Qian Gong; Avi M. Mandell; Prabal Saxena; Michael W. McElwain; Aki Roberge; John Krist; A. J. Eldorado Riggs; Eric J. Cady; Camilo Mejia Prada; Timothy Brandt; Ewan Douglas; Kerri Cahoy
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Paper Abstract

A primary goal of direct imaging techniques is to spectrally characterize the atmospheres of planets around other stars at extremely high contrast levels. To achieve this goal, coronagraphic instruments have favored integral field spectrographs (IFS) as the science cameras to disperse the entire search area at once and obtain spectra at each location, since the planet position is not known a priori. These spectrographs are useful against confusion from speckles and background objects, and can also help in the speckle subtraction and wavefront control stages of the coronagraphic observation. We present a software package, the Coronagraph and Rapid Imaging Spectrograph in Python (crispy) to simulate the IFS of the WFIRST Coronagraph Instrument (CGI). The software propagates input science cubes using spatially and spectrally resolved coronagraphic focal plane cubes, transforms them into IFS detector maps and ultimately reconstructs the spatio-spectral input scene as a 3D datacube. Simulated IFS cubes can be used to test data extraction techniques, refine sensitivity analyses and carry out design trade studies of the flight CGI-IFS instrument. crispy is a publicly available Python package and can be adapted to other IFS designs.

Paper Details

Date Published: 1 September 2017
PDF: 15 pages
Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000B (1 September 2017); doi: 10.1117/12.2273066
Show Author Affiliations
Maxime J. Rizzo, NASA Goddard Space Flight Ctr. (United States)
Tyler D. Groff, NASA Goddard Space Flight Ctr. (United States)
Neil T. Zimmermann, NASA Goddard Space Flight Ctr. (United States)
Qian Gong, NASA Goddard Space Flight Ctr. (United States)
Avi M. Mandell, NASA Goddard Space Flight Ctr. (United States)
Prabal Saxena, NASA Goddard Space Flight Ctr. (United States)
Michael W. McElwain, NASA Goddard Space Flight Ctr. (United States)
Aki Roberge, NASA Goddard Space Flight Ctr. (United States)
John Krist, Jet Propulsion Lab. (United States)
A. J. Eldorado Riggs, Jet Propulsion Lab. (United States)
Eric J. Cady, Jet Propulsion Lab. (United States)
Camilo Mejia Prada, Jet Propulsion Lab. (United States)
Timothy Brandt, Institute for Advanced Study (United States)
Ewan Douglas, Massachusetts Institute of Technology (United States)
Kerri Cahoy, Massachusetts Institute of Technology (United States)


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

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