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We report here the first results from a 15-yr long variability monitoring ofthe z=2.0 quasar QSO B1312+7837. It shows luminosity changes with a periodP~6.13 yr (P~2.04 yr at rest frame) and an amplitude of ~0.2mag, superimposedon a gradual dimming at a rate of ~0.55mag per 100 yrs. Two false periodsassociated with power peaks in the data windowing function were discarded. Themeasured period is confirmed with a bootstrapping Monte-Carlo simulation. Adamped random walk model yields a better fit to the data than a sine-functionmodel, but at the cost of employing some high frequency variations which aretypically not seen in quasars. We consider the possible mechanisms driving thisvariability, and conclude that orbital motion of two supermassive black holes -result from a recent galaxy merger - is a possible explanation.

Periodic variability of the z=2.0 quasar QSO B1312+7837