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CVSO 30 is a unique young low-mass system, because, for the first time, aclose-in transiting and a wide directly imaged planet candidates are foundaround a common host star. The inner companion, CVSO 30 b, is the firstpossible young transiting planet orbiting a previously known weak-lined T-Tauristar. With five telescopes of the 'Young Exoplanet Transit Initiative' (YETI)located in Asia, Europe and South America we monitored CVSO 30 over three yearsin a total of 144 nights and detected 33 fading events. In two more seasons wecarried out follow-up observations with three telescopes. We can confirm thatthere is a change in the shape of the fading event between differentobservations and that the fading event even disappears and reappears. A totalof 38 fading event light curves were simultaneously modelled. We derived theplanetary, stellar, and geometrical properties of the system and found themslightly smaller but in agreement with the values from the discovery paper. Theperiod of the fading event was found to be 1.36 s shorter and 100 times moreprecise than the previous published value. If CVSO 30 b would be a giant planeton a precessing orbit, which we cannot confirm, yet, the precession period maybe shorter than previously thought. But if confirmed as a planet it would bethe youngest transiting planet ever detected and will provide importantconstraints on planet formation and migration time-scales.

YETI observations of the young transiting planet candidate CVSO 30 b