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Proceedings Paper

The CHARIS IFS for high contrast imaging at Subaru
Author(s): Tyler D. Groff; N. Jeremy Kasdin; Mary Anne Limbach; Michael Galvin; Michael A. Carr; Gillian Knapp; Timothy Brandt; Craig Loomis; Norman Jarosik; Kyle Mede; Michael W. McElwain; Douglas B. Leviton; Kevin H. Miller; Manuel A. Quijada; Olivier Guyon; Nemanja Jovanovic; Naruhisa Takato; Masahiko Hayashi
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Paper Abstract

The Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS) is an integral field spectrograph (IFS) being built for the Subaru telescope. CHARIS will take spectra of brown dwarfs and hot Jovian planets in the coronagraphic image provided by the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) and AO188 adaptive optics systems.1, 2 The system is designed to detect objects five orders of magnitude dimmer than their parent star down to an 80 milliarcsecond inner working angle. For characterization, CHARIS has a high-resolution prism providing an average spectral resolution of R82, R69, and R82 in J, H, and K bands respectively. The so-called discovery mode uses a second low-resolution prism with an average spectral resolution of R19 spanning 1.15-2.37 microns (J+H+K bands). This is unique compared to other high contrast IFS designs. It augments low inner working angle performance by reducing the separation at which we can rely on spectral differential imaging. The principal challenge for a high-contrast IFS is quasi-static speckles, which cause undue levels of spectral crosstalk. CHARIS has addressed this through several key design aspects that should constrain crosstalk between adjacent spectral features to be below 1%. Sitting on the Nasmyth platform, the alignment between the lenslet array, prism, and detector will be highly stable, key for the performance of the data pipeline. Nearly every component has arrived and the project is entering its final build phase. Here we review the science case, the resulting design, status of final construction, and lessons learned that are directly applicable to future exoplanet instruments.

Paper Details

Date Published: 16 September 2015
PDF: 10 pages
Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96051C (16 September 2015); doi: 10.1117/12.2188465
Show Author Affiliations
Tyler D. Groff, Princeton Univ. (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)
Mary Anne Limbach, Princeton Univ. (United States)
Michael Galvin, Princeton Univ. (United States)
Michael A. Carr, Princeton Univ. (United States)
Gillian Knapp, Princeton Univ. (United States)
Timothy Brandt, Princeton Univ. (United States)
Craig Loomis, Princeton Univ. (United States)
Norman Jarosik, Princeton Univ. (United States)
Kyle Mede, Subaru Telescope (United States)
Michael W. McElwain, NASA Goddard Space Flight Ctr. (United States)
Douglas B. Leviton, Leviton Metrology Solutions (United States)
Kevin H. Miller, NASA Goddard Space Flight Ctr. (United States)
Manuel A. Quijada, NASA Goddard Space Flight Ctr. (United States)
Olivier Guyon, Subaru Telescope (United States)
Nemanja Jovanovic, Subaru Telescope (United States)
Naruhisa Takato, Subaru Telescope (United States)
Masahiko Hayashi, National Astronomical Observatory of Japan (Japan)

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

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