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| Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) | |
|---|---|
| Name | Subaru Coronagraphic Extreme Adaptive Optics |
| Acronym | SCExAO |
| Facility | Subaru Telescope |
| Organization | National Astronomical Observatory of Japan; University of Tokyo; California Institute of Technology; University of Arizona |
| Country | Japan |
| Location | Mauna Kea |
| Wavelength | Visible to near-infrared |
| First light | 2010s |
| Status | Operational |
Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) SCExAO is a high-contrast imaging instrument for the Subaru Telescope on Mauna Kea, designed to enable direct imaging and characterization of faint companions and circumstellar material near bright stars. Developed through collaborations involving the National Astronomical Observatory of Japan, the University of Tokyo, and several US institutions including the California Institute of Technology and the University of Arizona, it combines extreme adaptive optics with advanced coronagraphy and integral-field spectroscopy to probe exoplanets, protoplanetary disks, and substellar objects.
SCExAO operates at visible to near-infrared wavelengths on the Subaru Telescope facility on Mauna Kea and complements instruments such as HiCIAO and CHARIS. The instrument was conceived in the context of high-contrast imaging programs associated with facilities like Gemini Observatory, Keck Observatory, and future projects such as Thirty Meter Telescope and European Extremely Large Telescope. SCExAO integrates technologies developed by teams affiliated with institutions including the National Astronomical Observatory of Japan, the University of Tokyo, University of Cambridge, and California Institute of Technology to reach contrasts required for imaging young giant planets and disk structures.
SCExAO’s optical train includes a high-order deformable mirror produced in collaboration with suppliers and research groups active in adaptive optics such as Laboratoire d'Astrophysique de Marseille and Laboratoire d'Optique Appliquée. Wavefront sensing employs visible-light sensors informed by techniques tested on platforms like Palomar Observatory and Very Large Telescope. Coronagraphic modules in SCExAO implement designs inspired by concepts used at European Southern Observatory facilities and incorporate vortex, Lyot, and phase-mask approaches used in instruments at Keck Observatory and Gemini Observatory. The instrument feeds spectrographs and imagers including an integral field unit similar in purpose to devices on Keck and VLT, and interfaces with detectors developed in collaboration with teams from Princeton University and NASA Jet Propulsion Laboratory.
SCExAO aims for extreme Strehl ratios and raw contrasts approaching those targeted by space missions such as James Webb Space Telescope and concepts like WFIRST. It delivers high-contrast imaging at small inner working angles comparable to systems deployed at Keck Observatory and Gemini South and enables differential techniques developed in the exoplanet community including angular differential imaging used in surveys by teams from Harvard University and University of California, Berkeley. Performance metrics are benchmarked against results from instruments like SPHERE at European Southern Observatory and GPI at Gemini Observatory.
Science programs using SCExAO include searches for young giant exoplanets associated with stellar associations such as Beta Pictoris moving group and TW Hydrae association, imaging of protoplanetary and debris disks around stars like HR 8799 and PDS 70 analogs, and spectroscopy of brown dwarfs comparable to objects characterized by teams at Max Planck Institute for Astronomy and University of Hawaii. Discoveries have contributed to understanding planet formation theories linked to work by researchers at Caltech and accretion studies related to observations by groups at University of Arizona.
SCExAO first saw on-sky commissioning in the 2010s and has undergone iterative upgrades, coordinated with observatory operations at Subaru Telescope and project partners such as National Astronomical Observatory of Japan and US university collaborators. Upgrades paralleled developments at other extreme AO facilities including SPHERE and GPI, and have integrated new deformable mirrors, wavefront sensors, and coronagraphs developed in collaboration with engineering groups at University of Cambridge and California Institute of Technology. Operational planning aligns with site management at Mauna Kea and instrument schedules for the Subaru Telescope.
Data reduction pipelines for SCExAO combine speckle suppression algorithms and integral-field spectroscopy extraction methods developed in the exoplanet imaging community, drawing on software traditions from groups at University of Toronto, University of Oxford, and Princeton University. Processing techniques include principal component analysis variants used by teams at ETH Zurich and matched-filter methods employed by researchers at University of Chicago. Software integration ensures compatibility with observatory data formats maintained by National Astronomical Observatory of Japan and common archives used by collaborations across Caltech and Harvard University.
SCExAO is the product of international collaboration among institutions including the National Astronomical Observatory of Japan, the University of Tokyo, California Institute of Technology, University of Arizona, and partners in Europe and North America such as University of Cambridge and Max Planck Institute for Astronomy. The instrument is integrated into the Subaru Telescope facility, coordinating time allocation with committees and surveys involving teams from NASA, national observatories like European Southern Observatory and Gemini Observatory, and academic groups across Japan and the United States.
Category:Astronomical instruments