Estimating the albedo of the exoplanets in presence of stellar activity

The stellar phase curves of a star orbited by just one planet include, in realistic conditions, the primary and secondary transit, three secondary effects, which the beaming effect, the ellipsoidal modulation and the reflected light component of the planet, plus two sources of noise, the stellar activity and the instrumental noise. In our paper 'Distinguishing the albedo of the exoplanets from the stellar activity' we aimed at analyzing whether it was possible to detect the reflected light component of a planet in the case of an active brilliant star and hypothesizing the instrumental noise to be on the same level of the predicted one for CHEOPS mission. We produced simulations of light curves including stellar spots photometric signatures generated with SOAP, a white noise to resemble the instrumental one, and the reflected light from the planet. Then, we used an MCMC with a periodic GP to estimate the retrieved value of the albedo. In this talk I will present the results of our work, and what they can teach us for the future observations and data analysis with CHEOPS.

PDF icon poster_albedo.pdf

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