Article Dans Une Revue Publications of the Astronomical Society of the Pacific Année : 2018

An H-band Vector Vortex Coronagraph for the Subaru Coronagraphic Extreme-Adaptive Optics System

J. Kühn
  • Fonction : Auteur
E. Serabyn
  • Fonction : Auteur
J. Lozi
  • Fonction : Auteur
N. Jovanovic
  • Fonction : Auteur
T. Currie
  • Fonction : Auteur
O. Guyon
T. Kudo
K. Liewer
  • Fonction : Auteur
G. Singh
M. Tamura
  • Fonction : Auteur
D. Mawet
D. Defrere
  • Fonction : Auteur

Résumé

The vector vortex is a coronagraphic imaging mode of the recently commissioned Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) platform on the 8 m Subaru Telescope. This multi-purpose high-contrast visible and near-infrared (R- to K-band) instrument is not only intended to serve as a VLT-class "planet-imager" instrument in the northern hemisphere, but also to operate as a technology demonstration testbed ahead of the ELTs-era, with a particular emphasis on small inner-working angle (IWA) coronagraphic capabilities. The given priority to small-IWA imaging led to the early design choice to incorporate focal-plane phase-mask coronagraphs. In this context, a test H-band vector vortex liquid crystal polymer waveplate was provided to SCExAO, to allow a one-to-one comparison of different small-IWA techniques on the same telescope instrument, before considering further steps. Here we present a detailed overview of the vector vortex coronagraph, from its installation and performances on the SCExAO optical bench, to the on-sky results in the extreme AO regime, as of late 2016/early 2017. To this purpose, we also provide a few recent on-sky imaging examples, notably high-contrast ADI detection of the planetary-mass companion κ Andromedae b, with a signal-to-noise ratio above 100 reached in less than 10 mn exposure time.

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hal-01782003 , version 1 (17-07-2025)

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J. Kühn, E. Serabyn, J. Lozi, N. Jovanovic, T. Currie, et al.. An H-band Vector Vortex Coronagraph for the Subaru Coronagraphic Extreme-Adaptive Optics System. Publications of the Astronomical Society of the Pacific, 2018, 130 (985), pp.035001. ⟨10.1088/1538-3873/aa9fe5⟩. ⟨hal-01782003⟩
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