Polarization analysis of GRAVITY and the VLTI

Felix Widmann; Frank Eisenhauer; Oliver Pfuhl; Nicolas Schuhler; Xavier Haubois; António Amorim; Michi Bauböck; Wolfgang Brandner; Jason Dexter; Feng Gao; Paulo J. V. Garcia; Reinhard Genzel; Stefan Gillessen; Alejandra Jimenez-Rosales; Sylvestre Lacour; Thomas Ott; Karine Perraut; Guy S. Perrin; Jinyi Shangguan; Odèle Straub; Christian Straubmeier; Eckhard Sturm; Sebastiano von Fellenberg

doi:10.1117/12.2559311

13 December 2020 Polarization analysis of GRAVITY and the VLTI

Felix Widmann, Frank Eisenhauer, Oliver Pfuhl, Nicolas Schuhler, Xavier Haubois, António Amorim, Michi Bauböck, Wolfgang Brandner, Jason Dexter, Feng Gao, Paulo J. V. Garcia, Reinhard Genzel, Stefan Gillessen, Alejandra Jimenez-Rosales, Sylvestre Lacour, Thomas Ott, Karine Perraut, Guy S. Perrin, Jinyi Shangguan, Odèle Straub, Christian Straubmeier, Eckhard Sturm, Sebastiano von Fellenberg

Author Affiliations +

Proceedings Volume 11446, Optical and Infrared Interferometry and Imaging VII; 114460S (2020) https://doi.org/10.1117/12.2559311
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

Instrumental polarization can have large effects on measurements with the VLTI, as it can alter measured polarization and introduce uncertainties. To understand these effects we measured and simulated the instrumental polarization of the VLTI and of GRAVITY. We are able to provide a calibration model for GRAVITY observations and quantify systematic uncertainties due to instrumental polarization. This work has shown to be crucial to measure the polarization of the galactic center black hole Sgr A* where we detect a swing in the polarization angle during flare events. While the analysis was done for GRAVITY, it also gives an important basis for the design of future near-infrared instruments at the VLTI.

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Felix Widmann, Frank Eisenhauer, Oliver Pfuhl, Nicolas Schuhler, Xavier Haubois, António Amorim, Michi Bauböck, Wolfgang Brandner, Jason Dexter, Feng Gao, Paulo J. V. Garcia, Reinhard Genzel, Stefan Gillessen, Alejandra Jimenez-Rosales, Sylvestre Lacour, Thomas Ott, Karine Perraut, Guy S. Perrin, Jinyi Shangguan, Odèle Straub, Christian Straubmeier, Eckhard Sturm, and Sebastiano von Fellenberg "Polarization analysis of GRAVITY and the VLTI", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 114460S (13 December 2020); https://doi.org/10.1117/12.2559311

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