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Kepler-91b is a rare example of a transiting hot Jupiter around a red giantstar, providing the possibility to study the formation and composition of hotJupiters under different conditions compared to main-sequence stars. However,the planetary nature of Kepler-91b, which was confirmed using phase-curvevariations by Lillo-Box et al., was recently called into question based on are-analysis of Kepler data. We have obtained ground-based radial velocityobservations from the Hobby-Eberly Telescope and unambiguously confirm theplanetary nature of Kepler-91b by simultaneously modeling the Kepler and radialvelocity data. The star exhibits temporally correlated noise due to stellargranulation which we model as a Gaussian Process. We hypothesize that it isthis noise component that led previous studies to suspect Kepler-91b to be afalse positive. Our work confirms the conclusions presented by Lillo-Box et al.that Kepler-91b is a 0.73+/-0.13 Mjup planet orbiting a red giant star.

Radial Velocity Observations and Light Curve Noise Modeling Confirm That Kepler-91b is a Giant Planet Orbiting a Giant Star