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Proceedings Paper

On-sky speckle nulling with the Subaru Coronagraphic Extreme AO (SCExAO) instrument
Author(s): Frantz Martinache; Olivier Guyon; Nemanja Jovanovic; Christophe Clergeon; Garima Singh; Tomoyuki Kudo
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Paper Abstract

Contrast limit for the direct imaging of extrasolar planets from ground based adaptive optics (AO) observations is set by the presence of static and slow-varying aberrations in the optical path that lead to the science instrument. To complement the otherwise highly successful angular differential imaging (ADI) technique toward small angular separation, we propose to employ additional wavefront control to modulate the diffraction. This flexible approach introduces enough diversity to discriminate genuine structures of the observed target from spurious diffraction features in the image. One possible implementation of such form of coherence differential imaging (CDI) is a speckle nulling algorithm that iteratively suppresses diffraction features inside a region constrained by the number of active elements of the deformable mirror modulating the wavefront, and the coronagraph. This paper presents on-sky results obtained with this approach, on the Subaru Coronagraphic Extreme AO (SCExAO) instrument.

Paper Details

Date Published: 7 August 2014
PDF: 10 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 914821 (7 August 2014); doi: 10.1117/12.2057298
Show Author Affiliations
Frantz Martinache, Lab. J.L. Lagrange, CNRS, Observatorie de la Côte d'Azur (France)
Subaru Telescope, National Astronomical Observatory of Japan (United States)
Olivier Guyon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
The Univ. of Arizona (United States)
Nemanja Jovanovic, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Christophe Clergeon, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Garima Singh, Subaru Telescope, National Astronomical Observatory of Japan (United States)
Tomoyuki Kudo, Subaru Telescope, National Astronomical Observatory of Japan (United States)


Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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