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The HARPS search for southern extra-solar planets. IX. Exoplanets orbiting HD 100777, HD 190647, and HD 221287
Context: The HARPS high-resolution high-accuracy spectrograph was madeavailable to the astronomical community in the second half of 2003.Since then, we have been using this instrument for monitoring radialvelocities of a large sample of Solar-type stars (≃1400 stars) inorder to search for their possible low-mass companions. Aims: Amongstthe goals of our survey, one is to significantly increase the number ofdetected extra-solar planets in a volume-limited sample to improve ourknowledge of their orbital elements distributions and thus obtain betterconstraints for planet-formation models. Methods: Radial-velocitieswere obtained from high-resolution HARPS spectra via thecross-correlation method. We then searched for Keplerian signals in theobtained radial-velocity data sets. Finally, companions orbiting oursample stars were characterised using the fitted orbital parameters. Results: In this paper, we present the HARPS radial-velocity data andorbital solutions for 3 Solar-type stars: HD 100777,HD 190647, and HD 221287. Theradial-velocity data of HD 100777 is best explainedby the presence of a 1.16 M_Jup planetary companion on a 384-dayeccentric orbit (e = 0.36). The orbital fit obtained for the slightlyevolved star HD 190647 reveals the presence of along-period (P = 1038 d) 1.9 M_Jup planetary companion on a moderatelyeccentric orbit (e = 0.18). HD 221287 is hosting a3.1 M_Jup planet on a 456-day orbit. The shape of this orbit is not verywell-constrained because of our non-optimal temporal coverage andbecause of the presence of abnormally large residuals. We find cluesthat these large residuals result from spectral line-profile variationsprobably induced by processes related to stellar activity.Based on observations made with the HARPS instrument on the ESO 3.6-mtelescope at the La Silla Observatory (Chile) under the GTO programme ID072.C-0488. Tables 2-4 are only available in electronic form athttp://www.aanda.org
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