Lunch Talk: Manuel Pichardo Marcano (AMNH)

Accreting white dwarf binaries, like cataclysmic variables (CVs) and AM CVns, and other types of compact binaries are known to be highly variable in timescales of seconds to years. Space-based missions like the Transiting Exoplanet Survey Satellite (TESS) have contributed immensely to the study of the variability and the detailed study of the outbursts from white dwarf binaries and other compact binaries in general. I will show how we can exploit the TESS observing and timing capabilities to study a particular type of accreting white dwarf binaries. I will present the results of the first systematic study of outbursting AM CVn systems and present for the first time strong limits on the duration and the morphology of the superoutbursts and normal outbursts in AM CVns. Sadly the same surveys cannot be used for dense stellar clusters, like globular clusters (GCs), due to crowding and limiting magnitudes. In the more than 30 years of operations, the Hubble Space Telescope (HST) observed numerous GCs, and the archive constitutes an invaluable resource. There are still a lot of open questions regarding the population of compact binaries in GCs. Especially for the population of the, predicted, most abundant type of compact binaries, cataclysmic variables. I present the first results of an ongoing survey, which uses archival Hubble Space Telescope data of globular clusters with different characteristics, to do the first search for faint cataclysmic variables in Globular clusters that is not biased in the X-rays. I will present the first results of this survey including the first candidate magnetic helium core white dwarf in the globular cluster NGC 6397.