Rotation periods for 107 M dwarfs from APACHE

We measure rotation periods in the range 0.5-190d, with the distribution peaking at ~30d. We revise the stellar masses and radii for our sample of rotators by exploiting the Gaia DR2 data.

For ~20 per cent of the sample, we compare the photometric rotation periods with those derived from different spectroscopic indicators, finding good correspondence in most cases. We compare our rotation periods distribution to the one obtained by the Kepler survey in the same mass range, and to that derived by the MEarth survey for stars in the mass range 0.07-0.25M_{sun}_. The APACHE and Kepler periods distributions are in good agreement, confirming the reliability of our results, while the APACHE distribution is consistent with the MEarth result only for the older/slow rotators, and in the overlapping mass range of the two surveys.