Astrophysics - Instrumentation and Methods for Astrophysics; Physics - Instrumentation and Detectors; Vortex; Exoplanet; Subaru; SCExAO
Abstract :
[en] 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 \kappa Andromedae b, with a signal-to-noise ratio above 100 reached in less than 10 mn exposure time.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Kühn, Jonas
Serabyn, Eugene
Lozi, Julien
Jovanovic, Nemanja
Currie, Thayne
Guyon, Olivier
Kudo, Tomoyuki
Martinache, Frantz
Liewer, Kurt
Singh, Garima
Tamura, Motohide
Mawet, Dimitri
Hagelberg, Janis
Defrere, Denis ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
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