NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Exoplanet Imaging with CHARIS and Future Synergies with WFIRST CGIThe principal science goal of directly imaging exoplanets is spectroscopy. At Subaru, the SCExAO instrument uses the CHARIS integral field spectrograph (IFS) to take spectra of young, self-luminous companions and disks in the near-infrared. CHARIS provides both R70 and R20 spectral resolutions across the J, H, and K bands. Of the two, R20 is the primary observing mode, which provides both excellent spectral coverage of the companions and a larger bandpass for advanced speckle subtraction techniques. Looking to the future, the WFIRST CoronaGraph Instrument (CGI) is a technology demonstration for future missions whose spectroscopic techniques are rooted in what has been demonstrated at ground observatories. CGI will reach very high contrast in broadband light with advanced wavefront control and coronagraphy techniques, paving the way for characterizing Earth-like planets. The spectral resolution of CGI spectroscopic modes is R50 with 15% bandpasses from 600 to 970nm. The calibration, speckle subtraction, and spectral extraction methods for CGI spectroscopy has a strong heritage from techniques developed for SCExAO+CHARIS. We discuss such synergies between CHARIS and CGI characterization capabilities from both a science and engineering perspective, including the new Wollaston polarization upgrade to CHARIS.




Document ID
20190033176
Acquisition Source
Goddard Space Flight Center
Document Type
Presentation
Authors
Groff, Tyler D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
November 22, 2019
Publication Date
November 17, 2019
Subject Category
Optics
Report/Patent Number
GSFC-E-DAA-TN74571
Meeting Information
Meeting: Subaru Telescope Anniversary Conference
Location: Waikoloa Beach, HI
Country: United States
Start Date: November 17, 2019
End Date: November 22, 2019
Sponsors: Subaru Telescope
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
No Preview Available