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A. A. Suchkov, A. Schultz (STScI)
We have studied a small sample of 8 F~stars from the list of stars with discovered planetary systems. All of the sample stars have been found to be located in the color--magnitude diagram within the region occupied by the Hyades F~stars and have metallicities within the Hyades' metallicity range. This suggests that the age of these stars is not very much different from the age of Hyades, ~600~to~700~Myr. Five of the stars turned out to be anomalously faint for their uvby colors, which independently places them into the group of extremely young stars identified recently by A. Suchkov. The emerging evidence for the young age of these stars is supported by the fact that the list of all stars with detected planets is dominated by stars whose metal abundance is significantly higher than the average metal abundance of the stars in the solar neighborhood. Detection of dust disks, which indicates a young age for the star, around at least three of the stars from the aforementioned list adds to this support. Our results for the F stars differ from the reported typical ages of 4 to 8 Gyr for several solar type stars. The reason might be that close giant planets around early type stars form/evolve differently than planetary systems around G~stars.
The author(s) of this abstract have provided an email address for comments about the abstract: suchkov@stsci.edu