Very high resolution spectro-interferometry with wavefront sensing capabilities on Subaru/SCExAO using photonics

Creators: Vievard, S.; Ahn, Kyohoon; Arriola, Alexander; Barjot, Kevin; Cvetojevic, Nick; Deo, Vincent; Duchène, G.; Gretzinger, Thomas; Gross, Simon; Guyon, Olivier; Huby, Elsa; Jovanovic, N.; Kotani, Takayuki; Lacour, Sylvestre; Lagadec, Tiphaine; Lallement, Manon; Lapeyrere, Vincent; Lozi, Julien; Marchis, Franck; Martin, Guillermo; Martinod, Marc-Antoine; Norris, Barnaby; Perrin, Guy; Rouan, Daniel; Skaf, Nour; Tuthill, Peter; Withford, Michael

Others:: Shaklan, Stuart B.; Ruane, Garreth J.

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Abstract

Post Extreme Adaptive-Optics (ExAO) spectro-interferometers design allows high contrast imaging with an inner working angle down to half the theoretical angular resolution of the telescope. This regime, out of reach for conventional ExAO imaging systems, is obtained thanks to the interferometric recombination of multiple sub-apertures of a single telescope, using single mode waveguides to remove speckle noise. The SCExAO platform at the Subaru telescope hosts two instruments with such design, coupled with a spectrograph. The FIRST instrument operates in the Visible (600-800nm, R~400) and is based on pupil remapping using single-mode fibers. The GLINT instrument works in the NIR (1450-1650nm, R~160) and is based on nulling interferometry. We present here how these photonic instruments have the unique capability to simultaneously do high contrast imaging and be included in the wavefront sensing architecture of SCExAO.

Additional Information

© 2021 Society of Photo-Optical Instrumentation Engineers (SPIE). The development of FIRST was supported by Centre National de la Recherche Scientifique CNRS (Grant ERC LITHIUM - STG - 639248). The development of SCExAO was supported by the Japan Society for the Promotion of Science (Grant-in-Aid for Research #23340051, #26220704, #23103002, #19H00703 & #19H00695), the Astrobiology Center of the National Institutes of Natural Sciences, Japan, the Mt Cuba Foundation and the director's contingency fund at Subaru Telescope. GLINT work was supported by the Australian Research Council Discovery Project DP180103413. Critical fabrication for GLINT was performed in part at the OptoFab node of the Australian National Fabrication Facility utilising Commonwealth as well as NSW state government funding. S. Gross acknowledges funding through a Macquarie University Research Fellowship (9201300682) and the Australian Research Council Discovery Program (DE160100714). N. Cvetojevic acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement CoG - 683029). The authors wish to recognize and acknowledge the very significant cultural role and reverence that the summit of Maunakea has always had within the indigenous Hawaiian community. We are most fortunate to have the opportunity to conduct observations from this mountain.

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