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Starspots properties and stellar activity from planetary transits

Published online by Cambridge University Press:  12 September 2017

Adriana Valio
Adriana Valio*
Affiliation:
Center for Radio Astronomy and Astrophysics (CRAAM)Mackenzie Presbyterian University, Sao Paulo, Brazil email: [email protected]
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Abstract

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Magnetic activity of stars manifests itself in the form of dark spots on the stellar surface. This in turn will cause variations of a few percent in the star light curve as it rotates. When an orbiting planet eclipses its host a star, it may cross in front of one of these spots. In this case, a “bump” will be detected in the transit lightcurve. By fitting these spot signatures with a model, it is possible to determine the spots physical properties such as size, temperature, location, magnetic field, and lifetime. Moreover, the monitoring of the spots longitude provides estimates of the stellar rotation and differential rotation. For long time series of transits during multiple years, magnetic cycles can also be determined. This model has been applied successfully to CoRoT-2, CoRoT-4, CoRot-5, CoRoT-6, CoRoT-8, CoRoT-18, Kepler-17, and Kepler-63.

Keywords

Stars: activitystars: rotation stars: spots
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S328: Living Around Active Stars , October 2016 , pp. 69 - 76
Copyright
Copyright © International Astronomical Union 2017 

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