Unveiling the nature of five new discovered X-ray pulsators

During a systematic search (the largest ever in the high energy band) for coherent periodicities in about 400,000 light curves of serendipitous sources detected by Swift X-Ray Telescope (XRT) and Chandra Advanced CCD Imaging Spectrometer (ACIS) we identified (the project is still on-going) 26 new X-ray pulsators. In this proposal we ask for XMM-Newton follow-up observations for five of them, which either show unusual properties or are not covered by further archival data. The requested observations will allow us to unveil their nature. We also expect to identify new classes of neutron stars and white dwarfs and/or extending our understanding of the physics of accretion toward lower luminosities.