Upgrading the GRAVITY fringe tracker for GRAVITY+
Upgrading the GRAVITY fringe tracker for GRAVITY+
Context. The GRAVITY beam-combiner at the Very Large Telescope Interferometer has recently made important contributions to many different fields of astronomy, from observations of the Galactic centre to the study of massive stars, young stellar objects, exoplanet atmospheres, and active galactic nuclei. These achievements were only made possible by the …