We have conducted a comprehensive search for optical phase variations of all planet candidates with tight orbits ( a / R _ { \star } < 10 ) in fifteen quarters of data from the Kepler space telescope .
After correcting for systematics , we found eight systems that appear to show secondary eclipses as well as phase variations .
Of these , five ( Kepler-5 , Kepler-6 , Kepler-8 , KOI-64 and KOI-2133 ) are new and three ( TrES-2 , HAT-P-7 and KOI-13 ) have previously published phase curves , albeit with many fewer observations .
We model the full phase curve of each planet candidate , including the primary and secondary transits , and derive their albedos , day- and night-side temperatures , ellipsoidal variations and Doppler beaming .
We find that KOI-64 and KOI-2133 have night-side temperatures well above their equilibrium values ( while KOI-2133 also has an albedo > 1 ) , so we conclude that they are likely to be self-luminous objects rather than planets .
The characteristics of the six other candidates are consistent with their being planets with low geometric albedos ( < 0.3 ) .
For TrES-2 and KOI-13 , the Kepler bandpass appears to probe atmospheric layers hotter than the planet ’ s equilibrium temperature .
For KOI-13 , we detect a never-before-seen third cosine harmonic with an amplitude of 6.7 \pm 0.3 ppm and a phase shift of -1.1 \pm 0.1 radians in the phase curve residual , which could be due to its spin-orbit misalignment .
We report derived planetary parameters for all six planets , including masses from ellipsoidal variations and Doppler beaming , and compare our results to published values when available .
Our results nearly double the number of Kepler exoplanets with measured phase curve variations , thus providing valuable new constraints on the properties of close-in hot Jupiters .