Photometric data of the two companion stars in the XO-2 binary system, and radial velocities of XO-2N used in our analysis. <P />Transit light curves of XO-2N and related to its hot Jupiter XO-2Nb come from the TASTE project (Nasimbeni et al., 2011A&A...527A..85N, Cat. J/A+A/527/A85). Light curves of both XO-2N and XO-2S were collected by the APACHE survey (e.g. Sozzetti et al., Hot Planets and Cool Stars, EPJ Web of Conferences, Volume 47, id.03006, 2013) and were used in particular to determine the rotation period of the two binary components. <P />Radial velocities of XO-2N were measured with the HARPS-N spectrograph at the Telescopio Nazionale Galileo (TNG), based at La Palma, Canary islands. <P />(4 data files). <P />