Posible influencia de exoplanetas sobre la actividad estelar: Nuevos resultados (parte II)

M. G. FLORES; A. E. COLLADO; M. JAQUE ARANCIBIA; C. E. SAFFE; A. P. BUCCINO

San Juan

Congreso; 59° Reunión Anual de la Asociación Argentina de Astronomía; 2016

ICATE

Our main aim of this work is to analyze 2 phenomena possibly related and at the same time very discussed in the literature. On the one hand, the difference in the activity levels shown by stars with and withoutplanets. On the other hand, the excess of Lithium (Li) depletion presented by stars with planets when they are compared to stars with similar characteristics that do not host planets. To reach our main aim, the work has been divided into 3 stages. Thus, in this second contribution we present an analysis of the activity indexes calculated for the whole sample. To do so, we used high resolution spectra (R ≈ 115 000) of 1004 FGK stars taken with the HARPS (High Accuracy Radial Velocity Planet Searcher) spectrograph, installed in the 3.6?m ESO telescope.We do not find a significant difference in the activity indexes of stars with and without planets. Furthemore, the chromosphere activity is not correlated with the mass of the planet.