First light of the CHARIS high-contrast integral-field spectrograph

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, Masahiko Hayashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

25 Scopus citations


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.

Original languageEnglish (US)
Title of host publicationTechniques and Instrumentation for Detection of Exoplanets VIII
EditorsStuart Shaklan
ISBN (Electronic)9781510612570
StatePublished - 2017
EventTechniques and Instrumentation for Detection of Exoplanets VIII 2017 - San Diego, United States
Duration: Aug 8 2017Aug 10 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


OtherTechniques and Instrumentation for Detection of Exoplanets VIII 2017
Country/TerritoryUnited States
CitySan Diego

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


  • Exoplanets
  • Extreme Adaptive Optics
  • High Contrast Imaging
  • Integral Field Spectrograph


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