WASP-178b CHEOPS light curves

This leads to the measurement of the planetary geometric albedo A_g_, which is an indicator of the presence of clouds in the atmosphere, and the recirculation efficiency {epsilon}, which quantifies the energy transport within the atmosphere. In this work we aim to measure A_g and {epsilon} for the planet WASP-178b, a highly irradiated giant planet with an estimated equilibrium temperature of 2450K.

We analyzed archival spectra and the light curves collected by CHEOPS and TESS to characterize the host WASP-178, refine the ephemeris of the system and measure the eclipse depth in the passbands of the two respective telescopes. We measured a marginally significant eclipse depth of 70+/-40ppm in the TESS passband and statistically significant depth of 70+/-20ppm in the CHEOPS passband. Combining the eclipse depth measurement in the CHEOPS (lambda_eff_=6300{AA}) and TESS (lambda_eff_=8000{AA}) passbands we constrained the dayside brightness temperature of WASP-178b in the 2250-2800K interval.