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Proceedings Paper

Design of the CHARIS integral field spectrograph for exoplanet imaging
Author(s): Tyler D. Groff; Mary Anne Peters; N. Jeremy Kasdin; Gillian Knapp; Michael Galvin; Michael Carr; Michael W. McElwain; Timothy Brandt; Markus Janson; James E. Gunn; Robert Lupton; Olivier Guyon; Frantz Martinache; Nemanja Jovanovic; Masahiko Hayashi; Naruhisa Takato
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Paper Abstract

Princeton University is building an integral field spectrograph (IFS), the Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS), for integration with the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system and the AO188 adaptive optics system on the Subaru telescope. CHARIS and SCExAO will measure spectra of hot, young Jovian planets in a coronagraphic image across J, H, and K bands down to an 80 milliarcsecond inner working angle. SCExAO’s coronagraphs and wavefront control system will make it possible to detect companions five orders of magnitude dimmer than their parent star. However, quasi-static speckles in the image contaminate the signal from the planet. In an IFS this also causes uncertainty in the spectra due to diffractive cross-contamination, commonly referred to as crosstalk. Post-processing techniques can subtract these speckles, but they can potentially skew spectral measurements, become less effective at small angular separation, and at best can only reduce the crosstalk down to the photon noise limit of the contaminating signal. CHARIS will address crosstalk effects of a high contrast image through hardware design, which drives the optical and mechanical design of the assembly. The work presented here sheds light on the optical and mechanical considerations taken in designing the IFS to provide high signal-to-noise spectra in a coronagraphic image from and extreme adaptive optics image. The design considerations and lessons learned are directly applicable to future exoplanet instrumentation for extremely large telescopes and space observatories capable of detecting rocky planets in the habitable zone.

Paper Details

Date Published: 26 September 2013
PDF: 9 pages
Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 88640H (26 September 2013); doi: 10.1117/12.2025081
Show Author Affiliations
Tyler D. Groff, Princeton Univ. (United States)
Mary Anne Peters, Princeton Univ. (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)
Gillian Knapp, Princeton Univ. (United States)
Michael Galvin, Princeton Univ. (United States)
Michael Carr, Princeton Univ. (United States)
Michael W. McElwain, NASA Goddard Space Flight Ctr. (United States)
Timothy Brandt, Princeton Univ. (United States)
Markus Janson, Princeton Univ. (United States)
James E. Gunn, Princeton Univ. (United States)
Robert Lupton, Princeton Univ. (United States)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Frantz Martinache, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Nemanja Jovanovic, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Masahiko Hayashi, National Astronomical Observatory of Japan (Japan)
Naruhisa Takato, Subaru Telescope, National Astronomical Observatory of Japan (United States)

Published in SPIE Proceedings Vol. 8864:
Techniques and Instrumentation for Detection of Exoplanets VI
Stuart Shaklan, Editor(s)

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