Dr. Tereza Klocova
(Astronomical Institute, Academy of Sciences of the Czech Republic,
Ondrejov)

Title:
Observation of a stellar flare during a transit of HD189733

Abstract:

HD189733 is an exoplanetary system consisting of a transiting hot Jupiter 
 and an active K2V-type main sequence star. We present an analysis of a
flare event which occurred during a primary transit. The flare is studied
in selected chromospheric lines: CaII H & K lines, Balmer lines (Halpha to
Hepsilon), the CaII infrared triplet lines and HeI D3. This analysis
shows, that the enhanced activity of an exoplanet host can influence cores
of several lines, including the lines of NaI D1 and D2, which are used for
an exoplanet atmosphere detection.