CHEOPS photometry of WASP-43

For example, the photometric observations of secondary eclipses lead to the measurement of the planetary geometric albedo A_g, which is an indicator of the presence of clouds in the atmosphere.We aimed to measure the A_g_ in the optical domain of WASP-43b, a moderately irradiated giant planet with an equilibrium temperature of ~1400K .To this purpose, we analyzed the secondary eclipse light curves collected by CHEOPS, together with TESS observations of the system and the publicly available photometry obtained with HST WFC3/UVIS.

We also analyze the archival infrared observations of the eclipses and retrieve the thermal emission spectrum of the planet. By extrapolating the thermal spectrum to the optical bands, we correct the optical eclipses for thermal emission and derive the optical A_g_. The fit of the optical data led to a marginal detection of the phase curve signal, characterized by an amplitude of 160+/-60ppm and 80^+60^_-50_ppm in the CHEOPS and TESS passband respectively, with an eastward phase shift of ~50 degree (1.5{sigma} detection).