KESPRINT: From warm Jupiters to rocky ultra-short period planets

The need for the precise determination of exoplanet masses and radii is indisputable: the most intriguing issues in exoplanetology, such as interior structure, formation and habitability, cannot be addressed without knowledge of these basic parameters.

Radial velocity observations of bright stars hosting transiting planets allow the determination of planetary densities, which are vital for studies of planetary composition and formation. The KESPRINT consortium has provided more than one third of the mass measurements of planets discovered by K2. Our discoveries range from warm Jupiters to systems with multiple short-period rocky planets.

We have also validated several planetary systems, where we were unable to measure the planetary mass with RVs. A particular focus of this work has been short-period planets around low-mass stars, including an Earth-sized planet in a 4.3-hour orbit around an M-dwarf, whose composition we constrain using tidal arguments.

In this talk, we summarise our recent results and place them into context, showing how they contribute to our understanding of planet diversity. The work KESPRINT plans to do in the TESS era will also be briefly discussed.

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