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Considerable effort has been applied towards understanding the preciseshaping mechanisms responsible for the diverse range of morphologies exhibitedby planetary nebulae (PNe). A binary companion is increasingly gaining supportas a dominant shaping mechanism, however morphological studies of the few PNethat we know for certain were shaped by binary evolution are scarce or biased.Newly discovered binary central stars (CSPN) from the OGLE-III photometricvariability survey have significantly increased the sample of postcommon-envelope (CE) nebulae available for morphological analysis. We presentGemini South narrow-band images for most of the new sample to complementexisting data in a qualitative morphological study of 30 post-CE nebulae.Nearly 30% of nebulae have canonical bipolar morphologies, however this risesto 60% once inclination effects are incorporated with the aid of geometricmodels. This is the strongest observational evidence yet linking CE evolutionto bipolar morphologies. A higher than average proportion of the sample showslow-ionisation knots, filaments or jets suggestive of a binary origin. Thesefeatures are also common around emission-line nuclei which may be explained byspeculative binary formation scenarios for H-deficient CSPN.

Binary planetary nebulae nuclei towards the Galactic bulge. II. A penchant for bipolarity and low-ionisation structures