70 cool giant exoplanets

To address this deficiency, we here describe an exomoon survey of 70 cool, giant transiting exoplanet candidates found by Kepler. We identify only one exhibiting a moon-like signal that passes a battery of vetting tests: Kepler-1708b.

We show that Kepler-1708b is a statistically validated Jupiter-sized planet orbiting a Sun-like quiescent star at 1.6au. The signal of the exomoon candidate, Kepler-1708 b-i, is a 4.8{sigma} effect and is persistent across different instrumental detrending methods, with a 1% false-positive probability via injection-recovery. Kepler-1708b-i is ~2.6 Earth radii and is located in an approximately coplanar orbit at ~12 planetary radii from its ~1.6au Jupiter-sized host.