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Six planetary nebulae (PN) are known in the Kepler space telescope field ofview, three newly identified. Of the 5 central stars of PN with useful Keplerdata, one, J193110888+4324577, is a short-period, post common envelope binaryexhibiting relativistic beaming effects. A second, the central star of thenewly identified PN Pa5, has a rare O(He) spectral type and a periodicvariability consistent with an evolved companion, where the orbital axis isalmost aligned with the line of sight. The third PN, NGC~6826 has a fastrotating central star, something that can only be achieved in a merger. Fourth,the central star of the newly identified PN Kn61, has a PG1159 spectral typeand a mysterious semi-periodic light variability which we conjecture to berelated to the interplay of binarity with a stellar wind. Finally, the centralstar of the circular PN A61 does not appear to have a photometric variabilityabove 2 mmag. With the possible exception of the variability of Kn61, all othervariability behaviour, whether due to binarity or not, would not easily havebeen detected from the ground. We conclude, based on very low numbers, thatthere may be many more close binary or close binary products to be discoveredwith ultra-high precision photometry. With a larger number of high precisionphotometric observations we will be able to determine how much higher than thecurrently known 15 per cent, the short period binary fraction for central starsof PN is likely to be.

Identifying close binary central stars of PN with Kepler