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As revealed by its peculiar Kepler light curve, the enigmatic star KIC8462852 undergoes short and deep flux dimmings at a priori unrelated epochs. Itpresents nonetheless all other characteristics of a quiet 1 Gyr old F3V star.These dimmings resemble the absorption features expected for the transit ofdust cometary tails. The exocomet scenario is therefore most commonlyadvocated. We reanalyzed the Kepler data and extracted a new high-quality lightcurve to allow for the search of shallow signature of single or a fewexocomets. We discovered that among the 22 flux dimming events that weidentified, two events present a striking similarity. These events occurred928.25 days apart, lasted for 4.4 days with a drop of the star brightness by1000 ppm. We show that the light curve of these events is well explained by theoccultation of the star by a giant ring system, or the transit of a string ofhalf a dozen of exocomets with a typical dust production rate of 10$^5$-10$^6$kg/s. Assuming that these two similar events are related to the transit of thesame object, we derive a period of 928.25 days. The following transit wasexpected in March 2017 but bad weather prohibited us to detect it fromground-based spectroscopy. We predict that the next event will occur from the3rd to the 8th of October 2019.

Detection of a repeated transit signature in the light curve of the enigma star KIC 8462852: a 928-day period?