Navegando por Autor "Valio, Adriana"

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Activity and rotation of Kepler-17
(The American Astronomical Society, 2017) Valio, Adriana; Estrela, Raissa; Netto, Yuri; Bravo, J. P.; Medeiros, José Renan de
Magnetic activity on stars manifests itself in the form of dark spots on the stellar surface, which cause modulations of a few percent in the light curve of the star as it rotates. When a planet eclipses its host star, it might cross in front of one of these spots, creating a "bump" in the transit light curve. By modeling these spot signatures, it is possible to determine the physical properties of the spots such as size, temperature, and location. In turn, monitoring of the spots' longitude provides estimates of the stellar rotation and differential rotation. This technique was applied to the star Kepler-17, a solar–type star orbited by a hot Jupiter. The model yields the following spot characteristics: average radius of 49 ± 10 Mm, temperatures of 5100 ± 300 K, and surface area coverage of 6 ± 4%...

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