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Asteroseismology of exoplanet host stars using Kepler SC data
Mia Sloth Lundkvist (LSW, University of Heidelberg), Hans Kjeldsen (Stellar Astrophysics Centre, Aarhus University), Simon Albrecht (Stellar Astrophysics Centre, Aarhus University), Guy Davies (University of Birmingham / Stellar Astrophysics Centre, Aarhus University), Camilla Agentoft (Stellar Astrophysics Centre, Aarhus University), et al.
We present a coherent asteroseismic analysis of all 280 exoplanet candidates host stars brighter than magnitude 13.5 for which short cadence Kepler data exist. We find that 102 of these candidates show a clear asteroseismic detection allowing measurement of the large frequency separation for p-modes. This in turn allows us to compute very precise radii and incident fluxes for the exoplanets. Using this information, we can detect a hot-super-Earth desert; a region in the radius-flux parameter space completely void of exoplanets. This implies that evaporation plays a role in sculpting the observed exoplanet population. All these exoplanet host stars represent the best characterized exoplanet systems and we discuss the stellar properties and improvement in the quality of the measurements of the exoplanet properties such as radius and incident flux. Most of the p-mode detections are of low signal-to-noise ratio and we can therefore use those results to estimate the implications for TESS asteroseismology of exoplanet host stars. In addition, this study emphasizes the importance of asteroseismology in order to obtain highly precise exoplantary parameters and that it is crucial for TESS to also observe the fainter stars.