Static phase aberrations in near-IR interferometry and GRAVITY's determination of the galactic center distanceStatic phase aberrations in near-IR interferometry and GRAVITY's determination of the galactic center distance

Julia Stadler; Guy Perin; Wolfgang Brandner; Christian Straubmeier; Karine Rousselet-Perraut; António Amorim; Paulo J. Garcia; Frank Eisenhauer; Michael Bauböck; Feng Gao; Reinhard Genzel; Stefan Gillessen; Alejandra Jimenez-Rosales; Thomas Ott; Jinyi Shangguan; Odèle Straub; Eckhard Sturm; Sebastiano von Fellenberg; Felix Widmann; Oliver Pfuhl; Sylvestre Lacour; Julien Woillez; Mathias Nowak

doi:10.1117/12.2576225

13 December 2020 Static phase aberrations in near-IR interferometry and GRAVITY's determination of the galactic center distanceStatic phase aberrations in near-IR interferometry and GRAVITY's determination of the galactic center distance

Julia Stadler, Guy Perin, Wolfgang Brandner, Christian Straubmeier, Karine Rousselet-Perraut, António Amorim, Paulo J. Garcia, Frank Eisenhauer, Michael Bauböck, Feng Gao, Reinhard Genzel, Stefan Gillessen, Alejandra Jimenez-Rosales, Thomas Ott, Jinyi Shangguan, Odèle Straub, Eckhard Sturm, Sebastiano von Fellenberg, Felix Widmann, Oliver Pfuhl, Sylvestre Lacour, Julien Woillez, Mathias Nowak

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Proceedings Volume 11446, Optical and Infrared Interferometry and Imaging VII; 114460M (2020) https://doi.org/10.1117/12.2576225
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The GRAVITY instrument has revolutionized optical/IR interferometry: fringe-tracking and phase-referencing allow for 30 micro-arcsecond astrometry in a dual beam mode, and for spectro-differential astrometry better than 10 micro-arcseconds. The control of systematic effects is essential to fully exploit this technological advancement. Among those systematics are static phase aberrations, introduced along the instrument's optical path, which in particular affect the inferred separation of two unresolved objects within the same FOV. Here, we present how the aberrations can be measured, characterized by low-order Zernike polynomials and, most importantly, how their impact on the astrometry is corrected. The resulting astrometry corrections are verified with calibration observations of a binary before we discuss how they affect GRAVITY's measurement of the galactic center distance.

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Julia Stadler, Guy Perin, Wolfgang Brandner, Christian Straubmeier, Karine Rousselet-Perraut, António Amorim, Paulo J. Garcia, Frank Eisenhauer, Michael Bauböck, Feng Gao, Reinhard Genzel, Stefan Gillessen, Alejandra Jimenez-Rosales, Thomas Ott, Jinyi Shangguan, Odèle Straub, Eckhard Sturm, Sebastiano von Fellenberg, Felix Widmann, Oliver Pfuhl, Sylvestre Lacour, Julien Woillez, and Mathias Nowak "Static phase aberrations in near-IR interferometry and GRAVITY's determination of the galactic center distanceStatic phase aberrations in near-IR interferometry and GRAVITY's determination of the galactic center distance", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 114460M (13 December 2020); https://doi.org/10.1117/12.2576225

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KEYWORDS

Interferometry

Calibration

Phase measurement

Visibility

Control systems

Integrated optics

Phase interferometry

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