ZTF measured rotational period of 40553 M- or G-dwarfs

However, because Kepler mainly targeted solar-like stars, there is a lack of measured periods for M-dwarfs, especially those at the fully convective limit. Therefore it is unclear if the intermediate period gap exists for mid- to late-M-dwarfs.

Here, we present a period catalog containing 40553 rotation periods (9535 periods >10days), measured using the Zwicky Transient Facility (ZTF). To measure these periods, we developed a simple pipeline that improves directly on the ZTF archival light curves and reduces the photometric scatter by 26%, on average. This new catalog spans a range of stellar temperatures that connect samples from Kepler with MEarth, a ground-based time-domain survey of bright M dwarfs, and reveals that the intermediate period gap closes at the theoretically predicted location of the fully convective boundary (GBP-GRP~2.45mag).