Program: GS-2008B-Q-65

The role of binarity in Planetary Nebula formation is a very hotly debated topic to which firm answers are currently lacking. Binarity is crucial to understanding PN morphology and evolution, and yet there exists a paucity of unequivocal close (common-envelope) binaries (~20 known). Specifically useful are eclipsing binaries as accurate probes of mass, but only 3 are known. We have effectively doubled the known sample thanks to the powerful combination of our significant new PN discoveries and OGLE-III photometry. Crucially, we found at least 3 more clear eclipsing binaries, one of which we propose a detailed study with GMOS to unravel its detailed physical characteristics together with spectroscopic classification of all other discoveries to critically inform subsequent follow-up.