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Rapidly rotating early-type main-sequence stars with transiting planets areinteresting in many aspects. Unfortunately, several astrophysical effects insuch systems are not well understood yet. Therefore, we performed a photometricmini-survey of three rapidly rotating stars with transiting planets, namelyKELT-17b, KELT-19Ab, and KELT-21b, using the Characterising ExoplanetsSatellite (CHEOPS), complemented with Transiting Exoplanet Survey Satellite(TESS) data, and spectroscopic data. We aimed at investigating the spin-orbitmisalignment and its photometrical signs, therefore the high-quality lightcurves of the selected objects were tested for transit asymmetry, transitduration variations, and orbital precession. In addition, we performed transittime variation analyses, obtained new stellar parameters, and refined thesystem parameters. For KELT-17b and KELT-19Ab we obtained significantly smallerplanet radius as found before. The gravity-darkening effect is very smallcompared to the precision of CHEOPS data. We can report only on a tentativedetection of the stellar inclination of KELT-21, which is about 60 deg. InKELT-17b and KELT-19Ab we were able to exclude long-term transit durationvariations causing orbital precession. The shorter transit duration ofKELT-19Ab compared to the discovery paper is probably a consequence of asmaller planet radius. KELT-21b is promising from this viewpoint, but furtherprecise observations are needed. We did not find any convincing evidence foradditional objects in the systems.

Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era