On-sky speckle nulling with the Subaru Coronagraphic Extreme AO (SCExAO) instrument

Frantz Martinache; Olivier Guyon; Nemanja Jovanovic; Christophe Clergeon; Garima Singh; Tomoyuki Kudo

doi:10.1117/12.2057298

7 August 2014 On-sky speckle nulling with the Subaru Coronagraphic Extreme AO (SCExAO) instrument

Frantz Martinache, Olivier Guyon, Nemanja Jovanovic, Christophe Clergeon, Garima Singh, Tomoyuki Kudo

Proceedings Volume 9148, Adaptive Optics Systems IV; 914821 (2014) https://doi.org/10.1117/12.2057298
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

Citation Download Citation

Frantz Martinache, Olivier Guyon, Nemanja Jovanovic, Christophe Clergeon, Garima Singh, and Tomoyuki Kudo "On-sky speckle nulling with the Subaru Coronagraphic Extreme AO (SCExAO) instrument", Proc. SPIE 9148, Adaptive Optics Systems IV, 914821 (7 August 2014); https://doi.org/10.1117/12.2057298

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