Precision measurements with adaptive optics
Jessica Lu

Ground-based telescopes equipped with adaptive optics systems have overcome the blurring effects of the Earth's atmosphere and now routinely provide diffraction-limited images at infrared wavelengths. This has led to a revolution in astrometry, and we can now measure stars' relative positions with 150 micro-arcsecond precision at infrared wavelengths. I will present a number of scientific results and future experiments enabled by such high-precision astrometry. This includes finding isolated stellar mass black holes via astrometric microlensing, constraining star formation theories from the internal dynamics of star clusters, and eventually measuring the motions of stars around the supermassive black hole in the center of M31. I will also discuss the current limitations and future technical advancements for high-precision astrometry and adaptive optics systems.