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Stellar activity, differential rotation, and exoplanets

Published online by Cambridge University Press:  26 August 2011

A. F. Lanza
A. F. Lanza*
Affiliation:
INAF-Osservatorio Astrofisico di Catania, Via S. Sofia, 78, 95123 Catania, Italy email: nuccio.lanza@oact.inaf.it
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Abstract

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The photospheric spot activity of some of the stars with transiting planets discovered by the CoRoT space experiment is reviewed. Their out-of-transit light modulations are fitted by a spot model previously tested with the total solar irradiance variations. This approach allows us to study the longitude distribution of the spotted area and its variations versus time during the five months of a typical CoRoT time series. The migration of the spots in longitude provides a lower limit for the surface differential rotation, while the variation of the total spotted area can be used to search for short-term cycles akin the solar Rieger cycles. The possible impact of a close-in giant planet on stellar activity is also discussed.

Keywords

Stars: activitystars: magnetic fieldsstars: spotsstars: rotationplanetary systems
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S273: The Physics of Sun and Star Spots , August 2010 , pp. 89 - 95
Copyright
Copyright © International Astronomical Union 2011

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