Stellar activity in exoplanet host stars

FLORES, M.; BUCCINO, A. P.; SAFFE, C.; MAUAS, P. J. D.

Taller; School on Fundamental Astrophysics; 2013

ICTP

In this work,we analyzed thepossible relation between stellar activity and the planet´sorbital parameters. Our observations were made at the 2.15m telescope of the Complejo Astronómico El Leoncito (CASLEO), which is located at 2552m above sea level, in the Argentinean Andes. We used the REOSC spectrograph to obtain a series of mid-resolution spectra. We studied the long-term activity of stars with planets. To do so, we used as activity indicator the well-known Mount Wilson index(S). Furthermore,we took cuasisimultaneous the spectra of stars without planets with the same spectralclass, to compare activity levels. These studies were complemented by photometric observations from ASAS.