The Penn State - Torun Planet Search

Details The Penn State - Torun Planet Search The Penn State - Torun Planet Search

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.0204n&link_type=abstract

American Astronomical Society, ESS meeting #2, #2.04

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Scientific paper

The PennState - Torun Planet Search (PTPS) is devoted to search and detailed characterization of planetary system around intermediate-mass stars.
These stars, due to their high effective temperature are not accessible to the radial velocity (RV) technique during the Main Sequence (MS) evolution. In principle one can look for planetary-mass companions to such stars using other methods (direct imaging, transits) instead. However, the most efficient way to detect and study planets around such objects is to apply the RV technique when they leave the MS and moving toward the giant branch lower effective temperatures and rotation velocities to allow for precise RV measurements.
Within PTPS precise radial velocities (RV) of approx.1000 targets are being obtained from spectra continuously gathered with the Hobby-Eberly Telescope and its High Resolution Spectrograph. The project resulted in discovery of planetary or brown dwarf mass companions to 5 stars. Recently 7 new systems were found, mainly around K giants (Gettel et al. in preparation, Nowak et al. in preparation).
In parallel to the RV survey the sample properties are studied in detail. Here we present current status and forthcoming results of the project. Detailed description of the samples (red clump giants, sub-giants and giants, evolved dwarfs) including mass, radius, metallicity and age distributions of target stars will be presented. Since complete description of planetary system hosts requires also information on their rotation velocities and abundances (including lithium abundance) we will presented them as well. As we collected multiple RV observations for all our stars and completed a detailed cross-correlation study we will also discuss binary contamination and present preliminary results on frequency of planetary companion candidates in all 3 samples.
We acknowledge the financial support from the Polish Ministry of Science and Higher Education through grants N203 510938 (AN) and from NASA grant NNX09AB36G (AW).

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