Infrared wavefront sensing for adaptive optics assisted galactic center observations with GRAVITY

Stefan Hippler; Wolfgang Brandner; Silvia Scheithauer; Martin Kulas; Johana Panduro; Peter Bizenberger; Henri Bonnet; Casey Deen; Françoise Delplancke-Ströbele; Frank Eisenhauer; Gert Finger; Zoltan Hubert; Johann Kolb; Eric Müller; Laurent Pallanca; Julien Woillez; Gérard Zins

doi:10.1117/12.2560222

13 December 2020 Infrared wavefront sensing for adaptive optics assisted galactic center observations with GRAVITY

Stefan Hippler, Wolfgang Brandner, Silvia Scheithauer, Martin Kulas, Johana Panduro, Peter Bizenberger, Henri Bonnet, Casey Deen, Françoise Delplancke-Ströbele, Frank Eisenhauer, Gert Finger, Zoltan Hubert, Johann Kolb, Eric Müller, Laurent Pallanca, Julien Woillez, Gérard Zins

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Proceedings Volume 11448, Adaptive Optics Systems VII; 114484K (2020) https://doi.org/10.1117/12.2560222
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Conference Poster

Abstract

We describe the operation of the infrared wavefront sensing based Adaptive Optics system CIAO. The Coudé Infrared Adaptive Optics (CIAO) system is a central auxiliary component of the Very Large Telescope interferometer (VLTI). It enables in particular Galactic Center observations using the GRAVITY interferometric instrument. CIAO compensates for phase disturbances caused by atmospheric turbulence, which all four 8 m Unit Telescopes (UT) experience during observation. Each of the four CIAO units generates an almost diffraction-limited image quality at its UT, which ensures that maximum flux of the observed stellar object enters the input fibers of GRAVITY. We present CIAO performance data obtained in the first 3 years of operation. We describe how CIAO is configured and used for observations with GRAVITY. We focus on the outstanding features of the infrared sensitive Saphira detector, which is used for the first time on Paranal, and show how it works as a wavefront sensor detector.

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Stefan Hippler, Wolfgang Brandner, Silvia Scheithauer, Martin Kulas, Johana Panduro, Peter Bizenberger, Henri Bonnet, Casey Deen, Françoise Delplancke-Ströbele, Frank Eisenhauer, Gert Finger, Zoltan Hubert, Johann Kolb, Eric Müller, Laurent Pallanca, Julien Woillez, and Gérard Zins "Infrared wavefront sensing for adaptive optics assisted galactic center observations with GRAVITY", Proc. SPIE 11448, Adaptive Optics Systems VII, 114484K (13 December 2020); https://doi.org/10.1117/12.2560222

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