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 made available to the astronomical community in the second half of 2003. Since then, we have been using this instrument for monitoring radial velocities of a large sample of Solar-type stars (≃1400 stars) in order to search for their possible low-mass companions.
Aims: Amongst the goals of our survey, one is to significantly increase the number of detected extra-solar planets in a volume-limited sample to improve our knowledge of their orbital elements distributions and thus obtain better constraints for planet-formation models.
Methods: Radial-velocities were obtained from high-resolution HARPS spectra via the cross-correlation method. We then searched for Keplerian signals in the obtained radial-velocity data sets. Finally, companions orbiting our sample stars were characterised using the fitted orbital parameters.
Results: In this paper, we present the HARPS radial-velocity data and orbital solutions for 3 Solar-type stars:
Astronomy and Astrophysics
- Pub Date:
- August 2007
- stars: individual: <ASTROBJ>HD 100777</ASTROBJ>;
- stars: individual: <ASTROBJ>HD 190647</ASTROBJ>;
- stars: individual: <ASTROBJ>HD 221287</ASTROBJ>;
- stars: planetary systems;
- techniques: radial velocities;
- 7 pages, 4 figures, RV data added in paper. A&