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Study of stellar activity through transit mapping of starspots

Published online by Cambridge University Press:  26 August 2011

Adriana Valio
Adriana Valio*
Affiliation:
Center for Radioastronomy and Astrophysics, Mackenzie University São Paulo, Brazil email: [email protected]
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Abstract

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During the eclipse of a planet, spots and other features on the surface of the host star may be occulted. This will cause small variations in the light curve of the star. Detailed studies of these variations during planetary transits provide a wealth of information about the starspots properties such as size, position, temperature (i.e. intensity), and magnetic field. If observation of multiple transits is available, the spots lifetime can be estimated. Moreover it may also be possible to determine the stellar rotation and whether differential rotation is present. Here, the study is performed using a method that simulates the passage of a planet (dark disk) in front of a star with multiple spots of different sizes, intensities, and positions on its surface. The data variations in the light curve of the star are fit using this method, yielding the starspots properties. Results are presented for solar-like stars, such as the active star CoRoT-2a.

Keywords

Starspotsstellar activityplanetary transitexoplanet
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 96 - 103
Copyright
Copyright © International Astronomical Union 2011

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