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Paper: The SARG Planet Search: Hunting for Planets Around Stars in Wide Binaries
Volume: 294, Scientific Frontiers in Research on Extrasolar Planets
Page: 47
Authors: Gratton, R.; Carretta, E.; Claudi, R. U.; Desidera, S.; Lucatello, S.; Bonanno, G.; Cosentino, R.; Scuderi, S.; Barbieri, M.; Marzari, F.; Endl, M.; Brocato, E.; Dolci, M.; Valentini, G.
Abstract: We present the first results of the planets search survey ongoing at the Italian National Telescope TNG (Canary Islands) using SARG, a very high resolution spectrograph (R = 150000) equipped with an iodine cell. We are currently achieving a radial velocity precision below 5 m/s in best cases, over a 2 years baseline. We are observing about 100 stars in wide binaries, with projected separation 100-1000 AU. The first aim is to study the possible effects of binarity on the formation and evolution of giant planets. The second aim is to investigate the planet-metallicity connection, by comparing the chemical composition of the components of the pairs. Thanks to the similarity of the components of the binaries we selected, differential abundances can be determined with errors as small as 0.01 dex. We identified one pair (HD 219542) whose components differ in metallicity by 0.10 dex (Gratton et al. 2001, A&A 377, 123).
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