Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..373b&link_type=abstract
SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July
Astronomy and Astrophysics
Astrophysics
Scientific paper
The spectrograph SOPHIE (1.93-m OHP) has been opened to the scientific community since November 2006. In order to increase the scientific return of the instrument, we develop automatic tools for characterizing targets. The use of cross-correlation technique for radial velocity measurements allows a direct estimation of the star metallicity [Fe/H] with a good approximation (± 0.1 dex). Such an estimation may help in the strategy of exoplanet search considering that a host planetary system is mostly found around metal-rich star. Stellar activity may be characterized by the relative flux in the emission lines of CaII H and K which can be scaled to the activity index R'HK}. Such index may help in the estimation of the radial velocity jitter due to the stellar activity and the discrimation between Doppler motion and radial-velocity noise due to stellar spots. We present here these calibrations, which will be soon available in the SOPHIE automatic data reduction pipeline, and discuss how these estimations of metallicity and activity are used in the large program of exoplanets search.
D. S.
G. H.
Beuzit Jean Luc
Boisse Isabelle
Bonfils Xavier
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