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Proceedings Paper

Development and recent results from the Subaru coronagraphic extreme adaptive optics system
Author(s): N. Jovanovic; O. Guyon; F. Martinache; C. Clergeon; G. Singh; T. Kudo; K. Newman; J. Kuhn; E. Serabyn; B. Norris; P. Tuthill; P. Stewart; E. Huby; G. Perrin; S. Lacour; S. Vievard; N. Murakami; O. Fumika; Y. Minowa; Y. Hayano; J. White; O. Lai; F. Marchis; G. Duchene; T. Kotani; J. Woillez
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Paper Abstract

The Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument is one of a handful of extreme adaptive optics systems set to come online in 2014. The extreme adaptive optics correction is realized by a combination of precise wavefront sensing via a non-modulated pyramid wavefront sensor and a 2000 element deformable mirror. This system has recently begun on-sky commissioning and was operated in closed loop for several minutes at a time with a loop speed of 800 Hz, on ~150 modes. Further suppression of quasi-static speckles is possible via a process called "speckle nulling" which can create a dark hole in a portion of the frame allowing for an enhancement in contrast, and has been successfully tested on-sky. In addition to the wavefront correction there are a suite of coronagraphs on board to null out the host star which include the phase induced amplitude apodization (PIAA), the vector vortex, 8 octant phase mask, 4 quadrant phase mask and shaped pupil versions which operate in the NIR (y-K bands). The PIAA and vector vortex will allow for high contrast imaging down to an angular separation of 1 λ/D to be reached; a factor of 3 closer in than other extreme AO systems. Making use of the left over visible light not used by the wavefront sensor is VAMPIRES and FIRST. These modules are based on aperture masking interferometry and allow for sub-diffraction limited imaging with moderate contrasts of ~100-1000:1. Both modules have undergone initial testing on-sky and are set to be fully commissioned by the end of 2014.

Paper Details

Date Published: 8 July 2014
PDF: 11 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91471Q (8 July 2014); doi: 10.1117/12.2057249
Show Author Affiliations
N. Jovanovic, Subaru Telescope, National Astronomical Observatory of Japan (United States)
O. Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Steward Observatory, The Univ. of Arizona (United States)
F. Martinache, Observatoire de la Côte d'Azur (France)
C. Clergeon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
LESIA, Observatoire de Paris à Meudon (France)
G. Singh, Subaru Telescope, National Astronomical Observatory of Japan (United States)
LESIA, Observatoire de Paris à Meudon (France)
T. Kudo, Subaru Telescope, National Astronomical Observatory of Japan (United States)
K. Newman, College of Optical Sciences, The Univ. of Arizona (United States)
NASA Ames Research Ctr. (United States)
J. Kuhn, Jet Propulsion Lab. (United States)
E. Serabyn, Jet Propulsion Lab. (United States)
B. Norris, The Univ. of Sydney (Australia)
P. Tuthill, The Univ. of Sydney (Australia)
P. Stewart, The Univ. of Sydney (Australia)
E. Huby, LESIA, Observatoire de Paris à Meudon (France)
G. Perrin, LESIA, Observatoire de Paris à Meudon (France)
S. Lacour, LESIA, Observatoire de Paris à Meudon (France)
S. Vievard, LESIA, Observatoire de Paris à Meudon (France)
N. Murakami, Hokkaido Univ. (Japan)
O. Fumika, Hokkaido Univ. (Japan)
Y. Minowa, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Y. Hayano, Subaru Telescope, National Astronomical Observatory of Japan (United States)
J. White, Gemini Observatory (United States)
O. Lai, Subaru Telescope, National Astronomical Observatory of Japan (United States)
F. Marchis, SETI Institute (United States)
G. Duchene, Univ. of California, Berkeley (United States)
Univ. Grenoble Alpes, CNRS, Institut de Planetologie et d'Astrophysique de Grenoble (France)
T. Kotani, Subaru Telescope, National Astronomical Observatory of Japan (United States)
J. Woillez, European Southern Observatory (Germany)


Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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