I. Boisse, M. Oshagh, C. Lovis, N. C. Santos, X. Dumusque, X. Bonfils, M. Montalto, G. Boué

Abstract
Most of the exoplanet science is dependent on the stellar knowledge. One of them that has to be understood is the magnetic activity when we search for planets with radial velocity or photometry measurements. The main shape of stellar activity and spots properties have to be understood, for example, to choose the best targets to search for low-mass planets in the habitable zone or to derive the accurate parameters of a planetary system. With that aim, we show in this presentation how these studies lead to give clues on spots latitudes and on the long term variation of stellar activity. The properties of magnetic activity on the low rotators solar-type stars are not easily reachable by other techniques (spectropolarimetry or Doppler imaging) and these studies should be used to constrain theories of stellar dynamo.

Proceedings of the annual meeting of the French Society of Astronomy & Astrophysics Nice, June 5-8, 2012
S. Boissier, P. de Laverny, N.;. Samadi Nardetto, D. Valls-Gabaud, H. Wozniak

Société Française d'Astronomie et d'Astrophysique
2012 December