Is there a metallicity enhancement in planet hosting red giants?
arXiv:0904.0374 · doi:10.1051/eas/1042023
Abstract
The Penn State/Toruń Centre for Astronomy Search for Planets Around Evolved Stars is a high-precision radial velocity (RV) survey aiming at planets detection around giant stars. It is based on observations obtained with the 9.2 m Hobby-Eberly Telescope. As proper interpretation of high precision RV data for red giants requires complete spectral analysis of targets we perform spectral modeling of all stars included in the survey. Typically, rotation velocities and metallicities are determined in addition to stellar luminosities and temperatures what allows us to estimate stellar ages and masses. Here we present preliminary results of metallicity studies in our sample. We search a metallicity dependence similar to that for dwarfs by comparing our results for a sample of 22 giants earlier than K5 showing significant RV variations with a control sample of 58 relatively RV-stable stars.
5 pages, 2 figures. To appear in "Extrasolar Planets in Multi-body Systems: Theory and Observations"
References in corpus (8)
- Spectroscopic [Fe/H] for 98 extra-solar planet-host stars: Exploring the probability of planet formation
- The metal-rich nature of stars with planets
- Precise radial velocities of giant stars. III. Spectroscopic stellar parameters
- Evolved stars hint to an external origin of enhanced metallicity in planet-hosting stars
- Ten Year Review of Queue Scheduling of the Hobby-Eberly Telescope
- A Planetary Mass Companion to the K0 Giant HD 17092
- Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties
- A Planet in a 0.6-AU Orbit Around the K0 Giant HD 102272