A CHEOPS white dwarf transit search

White dwarf spectroscopy shows that nearly half of white atmospheres contain metals must have been accreted from planetary material survived the red giant phases stellar evolution. We can use metal pollution in as flags, signalling recent accretion, order to prioritize an efficient sample dwarfs search for transiting material. present a planetesimals orbiting six nearby with CHaracterising ExOPlanet Satellite (CHEOPS). The targets are relatively faint CHEOPS, 11 mag < G 12.8 mag. used aperture photometry data products CHEOPS mission well custom point-spread function periodic variations flux due planetesimals. detect no significant cannot be attributed spacecraft systematics, despite reaching photometric precision 2 ppt 60 s exposures on each target. simulate observations show small survey is sensitive primarily Moon-sized objects periods between 3 h P 10 h, radii R ≳ 1000 km.