From Event: SPIE Optical Engineering + Applications, 2017
One of the leading direct Imaging techniques, particularly in ground-based imaging, uses a coronagraphic system and integral field spectrograph (IFS). The Coronagraphic High Angular Resolution Imaging Spectrograph (CHARIS) is an IFS that has been built for the Subaru telescope. CHARIS has been delivered to the observatory and now sits behind the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) system. CHARIS has ‘high’ and ‘low’ resolution operating modes. The high-resolution mode is used to characterize targets in J, H, and K bands at R70. The low-resolution prism is meant for discovery and spans J+H+K bands (1.15-2.37 microns) with a spectral resolution of R18. This discovery mode has already proven better than 15-sigma detections of HR8799c,d,e when combining ADI+SDI. Using SDI alone, planets c and d have been detected in a single 24 second image. The CHARIS team is optimizing instrument performance and refining ADI+SDI recombination to maximize our contrast detection limit. In addition to the new observing modes, CHARIS has demonstrated a design with high robustness to spectral crosstalk. CHARIS has completed commissioning and is open for science observations.
Tyler Groff, Jeffrey Chilcote, Timothy Brandt, N. Jeremy Kasdin, Michael Galvin, Craig Loomis, Maxime Rizzo, Gillian Knapp, Olivier Guyon, Nemanja Jovanovic, Julien Lozi, Thayne Currie, Naruhisa Takato, and Masahiko Hayashi, "First light of the CHARIS high-contrast integral-field spectrograph," Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 1040016 (Presented at SPIE Optical Engineering + Applications: August 09, 2017; Published: 1 September 2017); https://doi.org/10.1117/12.2273525.
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