| Intrinsic Stellar Limitations to Planet Searches With Radial-Velocity Techniques (2007) | |||||||||||||
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| . To date, more than 20 extra-solar giant planets have been found using high-precision radial-velocity techniques. In June 1998 we started a long-term extra-solar planet-search programme using the CORALIE spectrograph, installed at the 1.2-m Euler Swiss telescope at La Silla observatory. The obtained CORALIE spectra were used to construct a new chromospheric activity index, SCOR , based on the Ca II H line central re-emission. The first results are presented, and we discuss in particular the relation between the radial-velocity scatter and R' HK , the fractional Ca II H and K flux corrected for the photospheric flux. 1. The CORALIE survey CORALIE is a high-resolution (=\Delta 50 000) echelle spectrograph mounted on the Nasmyth focus of the new 1.2-m Euler Swiss telescope at ESO (La Silla), Chile. It was specially designed for high-precision (few m s \Gamma1 ) radial-velocity (RV) measurements in order to search for extra-solar planets 3 (Queloz et al. 1999a). After one year of ... | |||||||||||||
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