Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in

  title={Magnetic activity in the photosphere of CoRoT-Exo-2a. Active longitudes and short-term spot cycle in},
  author={Antonino Francesco Lanza and Isabella Pagano and Giuseppe Leto and Sergio Messina and Suzanne Aigrain and Roi Alonso and Michel Auvergne and Annie Baglin and Pierre Barge and Aldo Stefano Bonomo and Patrick Boumier and Andrew Collier Cameron and M. Comparato and Giuseppe Cutispoto and J. R. De Medeiros and Bernard H. Foing and Alexander Kaiser and Claire Moutou and Padmakar Singh Parihar and A. V. R. Silva and Werner W. Weiss},
  journal={Astronomy and Astrophysics},
Context. The space experiment CoRoT has recently detected transits by a hot Jupiter across the disk of an active G7V star (CoRoTExo-2a) that can be considered as a good proxy for the Sun at an age of approximately 0.5 Gyr. Aims. We present a spot modelling of the optical variability of the star during 142 days of uninterrupted observations performed by CoRoT with unprecedented photometric precision. Methods. We apply spot modelling approaches previously tested in the case of the Sun by… 

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