Unlocking stellar ages with Gaia: prospects for galactic archaeology and exoplanet populations
Ruth Angus

The processes behind the formation of the galaxy and the formation of exoplanets are two elusive and complicated topics in astrophysics connected by a common theme: stellar ages. Main sequence stars comprise the majority of our galaxy but unfortunately their ages are notoriously difficult to measure. Their positions on the HR diagram don't change significantly during their hydrogen burning lifetimes, a fact that is convenient for life on Earth but inconvenient for galactic archaeologists. Now, due to the abundance of rotation periods for MS stars provided by Kepler and to-be provided by TESS, LSST and Wfirst, rotation-dating is the most readily available, precise method for inferring stellar ages. Rotation-dating works well for young stars but a question mark still hangs over its accuracy for stars older than the Sun. I will present methods for inferring probabilistic rotation periods from light curves and discuss prospects for improving rotation-dating methods using Gaia, Kepler, TESS, LSST and Wfirst.