Data: 09.06.2022

Palestrante: Dr. Susana Barros (Instituto de Astrofísica e Ciências do Espaço)

Link: https://youtu.be/tT_Mkkuhp1U

Slides: https://linea.org.br/wp-content/uploads/lineadbfiles/apresentacao/WASP103.pdf

Resumo: Tidal forces between short-period planets and their host stars are extreme. These lead to the deformation of the planet and the shrinkage of the planet’s orbit. Using the new ESA mission CHEOPS we are attempting to measure both these effects for a sample of exoplanets. Measuring the tidal deformation of the planet would allow us to estimate the second degree fluid Love number and gain insight into the planet\\\\’s internal structure. Measuring the tidal decay timescale would allow us to estimate the stellar tidal quality factor, which is key to constraining stellar physics. WASP-103 was our first since it had the largest estimated signature of the tidal deformation. I will present the first detection of the tidal deformation of a planet directly from its light curve. This allowed us to measure the Love number of WASP-103b. We also found a hint that the orbital period of WASP-103b is increasing contrary to what is expected from tidal decay. I will explore the scenarios that could explain these observations.