TY - CONF
AU - Felix Widmann
AU - Frank Eisenhauer
AU - Oliver Pfuhl
AU - Nicolas Schuhler
AU - Xavier Haubois
AU - A. Amorim
AU - Michi Baubock
AU - Wolfgang Brandner
AU - Jason Dexter
AU - feng gao
AU - Paulo Garcia
AU - Reinhard Genzel
AU - Stefan Gillessen
AU - Alejandra Jimenez-Rosales
AU - Sylvestre Lacour
AU - Thomas Ott
AU - Karine Rousselet-Perraut
AU - Guy Perrin
AU - Jinyi Shangguan
AU - Odele Straub
AU - Christian Straubmeier
AU - Eckhard Sturm
AU - Sebastiano von Fellenberg
AU - Antoine Mérand
AU - Stephanie Sallum
AU - Peter Tuthill
AB - 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.
BT - Optical and Infrared Interferometry and Imaging VII
DA - 2020-12
DO - 10.1117/12.2559311
ET - Optical and Infrared Interferometry and Imaging VII
N2 - 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.
PB - SPIE
PY - 2020
SN - 9781510636798
EP - online only
T2 - Optical and Infrared Interferometry and Imaging VII
TI - Polarization analysis of GRAVITY and the VLTI
VL - 11446
ER -