Timing analysis in microlensing
  Timing analysis is a powerful tool used to determine periodic features of physical phenomena. Here we review two applications of timing analysis to gravitational microlensing events. The first one, in particular cases, allows the estimation of the orbital period of binary lenses, which in turn enables the breaking of degeneracies. The second one is a method to measure the rotation period of the lensed star by observing signatures due to stellar spots on its surface. 
Mos\`e Giordano, Achille Nucita, Francesco De Paolis, Gabriele   Ingrosso
astro-ph.SR astro-ph.EP