CHEOPS observations of the pulsating planetary system WASP-33

Kurzfassung

WASP-33 b is a hot Jupiter orbiting a massive, fast rotating Delta Scuti-type star. We report transit and occultation observations of WASP-33 b made with ESA’s CHEOPS satellite. After a challenging detrending for instrumental effects, and for stellar pulsations, are able to put some constraints on the obliquity of the system via the gravity-darkened transits, and confirm the previously observed nodal precession. Detrending the occultation data is particularly challenging, since the amplitude of the stellar pulsations is much greater than the occultation depth. Nevertheless, we make a robust detection of the occultation and provide some constraints for atmospheric models.