Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jkas...38..315s&link_type=abstract
Journal of the Korean Astronomical Society, vol. 38, no. 2, pp. 315-318
Astronomy and Astrophysics
Astrophysics
Stars: Late-Type, Stars: Planetary Systems, Techniques: Radial Velocities
Scientific paper
We have carried out a precise Doppler survey of G-type giants aiming to unveil the properties of planetary systems in intermediate-mass stars (1.5--5M&sun;). G-type giants are promising targets for Doppler planet searches around massive stars, because they are slow-rotators and have many sharp absorption lines in their spectra and their surface activities are relatively low in contrast to their younger counterparts on the main-sequence (B--A stars). We are now monitoring radial velocities of about 300 late G-type (including early K-type) giants using HIgh Dispersion Echelle Spectrograph (HIDES) at Okayama Astrophysical Observatory. We have achieved a Doppler precision of about 6--7 m/s over a time span of 3 years using an iodine absorption cell. We found that most of the targets have radial velocity scatters of σ˜ 10--20 m s-1 over 1--3 years, with the most stable reaching levels of 6--8 m s-1. Up to now, we have succeeded in discovering the first extrasolar planet around a G-type giant star HD 104985, and also found several candidates showing significant radial velocity variations, suggesting the existence of stellar and substellar companions. Observations have continued to establish their variability.
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