The subaru coronagraphic extreme AO high sensitivity visible wavefront sensors

Christophe Clergeon, Olivier Guyon, Frantz Martinache, Jean Pierre Veran, Eric Gendron, Gerard Rousset, Carlos Correia, Vincent Garrel

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

2 Scopus citations

Abstract

A diffraction-limited 30-meters class telescope theoretically provides a 10 mas resolution limit in the near infrared. Modern coronagraphs offer the means to take full advantage of this angular resolution allowing to explore at high contrast, the innermost parts of nearby planetary systems to within a fraction of an astronomical unit: an unprecedented capability that will revolutionize our understanding of planet formation and evolution across the habitable zone. A precursor of such a system is the Subaru Coronagraphic Extreme AO project. SCExAO [9] uses advanced coronagraphic technique for high contrast imaging of exoplanets and disks as close as 1 λ/D from the host star. In addition to unusual optics, achieving high contrast at this small angular separation requires a wavefront sensing and control architecture which is optimized for exquisite control and calibration of low order aberrations. To complement the current near-IR wavefront control system driving a single MEMS type deformable mirror mounted on a tip-tilt mount, two high order and high sensitivity visible wavefront sensors have been integrated to SCEXAO: - a non-modulated Pyramid wavefront sensor (CHEOPS) which is a sensitivity improvement over modulated Pyramid systems now used in high performance astronomical AO, - a non-linear wavefront sensor [4] designed in 2012 by Subaru Telescope with the collaboration of the NRC-CNRC which is expected to improve significantly the achieved sensitivity of low order aberations measurements. We will present the CHEOPS last results measured in laboratory and during its first light downstream the Subaru AO188 instrument, and then conclude introducing the primary prototype of the SCExAO non-linear curvature wavefront sensor which is planned to be tested on sky in 2014.

Original languageEnglish (US)
Title of host publication3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes
PublisherINAF - Osservatorio Astrofisico di Arcetri Largo Enrico Fermi
ISBN (Print)9788890887604
DOIs
StatePublished - 2013
Event3rd Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2013 - Florence, Italy
Duration: May 26 2013May 31 2013

Publication series

Name3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes

Other

Other3rd Conference on Adaptive Optics for Extremely Large Telescopes, AO4ELT 2013
CountryItaly
CityFlorence
Period5/26/135/31/13

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics

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  • Cite this

    Clergeon, C., Guyon, O., Martinache, F., Veran, J. P., Gendron, E., Rousset, G., Correia, C., & Garrel, V. (2013). The subaru coronagraphic extreme AO high sensitivity visible wavefront sensors. In 3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes (3rd AO4ELT Conference - Adaptive Optics for Extremely Large Telescopes). INAF - Osservatorio Astrofisico di Arcetri Largo Enrico Fermi. https://doi.org/10.12839/AO4ELT3.13398