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In spite of the huge advances in exoplanet research provided by the NASAKepler Mission, there remain only a small number of transit detections aroundevolved stars. Here we present a reformulation of the noise properties ofred-giant stars, where the intrinsic stellar granulation, and the stellaroscillations described by asteroseismology play a key role. The new noise modelis a significant improvement on the current Kepler results for evolved stars.Our noise model may be used to help understand planet detection thresholds forthe ongoing K2 and upcoming TESS missions, and serve as a predictor of stellarnoise for these missions. As an application of our noise model, we explore theminimum detectable planet radii for red giant stars, and find that Neptunesized planets should be detectable around low luminosity red giant branchstars.

A simple model to describe intrinsic stellar noise for exoplanet detection around red giants