On-sky speckle nulling demonstration at small angular separation with SCExAO

Frantz Martinache, Olivier Guyon, Nemanja Jovanovic, Christophe Clergeon, Garima Singh, Tomoyuki Kudo, Thayne Currie, Christian Thalmann, Michael McElwain, Motohide Tamura

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


This paper presents the first on-sky demonstration of speckle nulling, which was achieved at the Subaru Telescope in the context of the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) Project. Despite the absence of a high-order high-bandwidth closed-loop AO system, observations conducted with SCExAO show that even in poor-to-moderate observing conditions, speckle nulling can be used to suppress static and slow speckles even in the presence of a brighter dynamic speckle halo, suggesting that more advanced high-contrast imaging algorithms developed in the laboratory can be applied to ground-based systems.

Original languageEnglish (US)
Pages (from-to)565-570
Number of pages6
JournalPublications of the Astronomical Society of the Pacific
Issue number940
StatePublished - Jun 2014


  • Astronomical Instrumentation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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