Finding habitable earths around white dwarfs with a robotic telescope transit survey

I discuss the possibility that white dwarfs might harbor habitable planets at 0.01 AU that arrive there after the red giant phase. These planets would be detectable with ground-based telescopes via deep transits of the star, and a transit survey of the nearest white dwarfs would favor detection of Earth-temperature planets, assuming they could form as close as twice the Roche limit. I show that a robotic survey is required for habitable planet transit detection around white dwarfs due to the large amount of sky coverage, geographical coverage with multiple telescopes, and significant observing time involved. Robotic telescopes such as LCOGT, ATLAS/WIST, and LSST could place interesting limits on the frequency of planets in the 3 Gyr continuously habitable zone of white dwarfs, possibly constraining frequencies as small as 0.1%.