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GRAVITY+ adaptive optics (GPAO) tests in Europe

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arxiv 2506.03721 v1 pith:5IN5VFVI submitted 2025-06-04 astro-ph.IM

GRAVITY+ adaptive optics (GPAO) tests in Europe

Florentin Millour (LAGRANGE) , Guillaume Bourdarot (MPE) , Jean-Baptiste Le Bouquin (IPAG) , Anthony Berdeu (LIRA) , Mathis Houll\'e (IPAG) , Philippe Berio (LAGRANGE) , Thibaut Paumard (LIRA) , Denis Defr\`ere (KU Leuven)
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Paulo Garcia Ferreol Soulez (CRAL) Sebastian Hoenig Fatm\'e Allouche (ESO) Martin Bachbucher (MPE) Christophe Bailet (LAGRANGE) Cyrille Blanchard (LIRA) Olivier Boebion (LAGRANGE) Henri Bonnet (ESO) Amit Brara (MPE) Marcel Carbillet (LAGRANGE) Stephan Czempiel (MPE) Alain Delboulb\'e (IPAG) Roderick Dembet (LIRA) Cl\'emence Edouard (LIRA) Frank Eisenhauer (MPE) Halmut Feuchtgruber (MPE) Christoph Furchstsam (MPE) Stefan Gillessen (MPE) Armin Goldbrunner (MPE) Tiago Gomes Carole Gouvret (LAGRANGE) Sylvain Guieu (IPAG) Michael Hartl (MPE) Johannes Hartwig (MPE) Frank Haussmann (MPE) David Huber (MPE) Ihsan Ibn Ta\"ieb (MPE) Johann Kolb (ESO) St\'ephane Lagarde (LAGRANGE) Olivier Lai (LAGRANGE) James Leftley (LAGRANGE) Dieter Lutz (MPE) Yves Magnard (IPAG) Hugo Nowacki (IPAG) Sylvain Oberti (ESO) Thomas Ott (MPE) Christian Rau (MPE) Sylvie Robbe-Dubois (LAGRANGE) Jules Scigliuto (LAGRANGE) Franz Soller (MPE) Pavel Shchekaturov (ESO) Daniel Schuppe (MPE) Eric Stadler (IPAG) Sinem Uysal (MPE) Felix Widmann (MPE) Ekherhard Wieprecht (MPE) Julien Woillez (ESO) Senol Yazici (MPE)
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We present in this proceeding the results of the test phase of the GRAVITY+ adaptive optics. This extreme AO will enable both high-dynamic range observations of faint companions (including exoplanets) thanks to a 40x40 sub-apertures wavefront control, and sensitive observations (including AGNs) thanks to the addition of a laser guide star to each UT of the VLT. This leap forward is made thanks to a mostly automated setup of the AO, including calibration of the NCPAs, that we tested in Europe on the UT+atmosphere simulator we built in Nice. We managed to reproduce in laboratory the expected performances of all the modes of the AO, including under non-optimal atmospheric or telescope alignment conditions, giving us the green light to proceed with the Assembly, Integration and Verification phase in Paranal.

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