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We report the detection of transit timing variations (TTVs) well in excess ofone hour in the Kepler multi-planet candidate system KOI 806. This systemexhibits transits consistent with three separate planets -- a Super-Earth, aJupiter, and a Saturn -- lying very nearly in a 1:2:5 resonance, respectively.We used the Kepler public data archive and observations with the GranTelescopio de Canarias to compile the necessary photometry. For the largestcandidate planet (KOI 806.02) in this system, we detected a large transittiming variation of -103.5$\pm$6.9 minutes against previously publishedephemeris. We did not obtain a strong detection of a transit color signatureconsistent with a planet-sized object; however, we did not detect a colordifference in transit depth, either. The large TTV is consistent withtheoretical predictions that exoplanets in resonance can produce large transittiming variations, particularly if the orbits are eccentric. The presence oflarge TTVs among the bodies in this systems indicates that KOI806 is verylikely to be a planetary system. This is supported by the lack of a strongcolor dependence in the transit depth, which would suggest a blended eclipsingbinary.

Detection of transit timing variations in excess of one hour in the Kepler multi-planet candidate system KOI 806 with the GTC