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[108.02] Candidate Kinematic Groups Among Stars with Planets: Sister stars to extrasolar planets?

P. Kalas (University of California, Berkeley), J.-M. Deltorn (Space Telescope Science Institute)

We use the Hipparcos catalog to search for stars that share the space velocities of 57 stars with planets. We find 27 stars with planets have at least one ``kinematic companion'' in a U, V, W box with size 4, 2 and 6 km/s, respectively. A Kolmogorov-Smirnov test on the metallicity distribution of F, G, and K stars shows that the stars with planets and their kinematic companions are likely members of the same, higher metallicity population, and separate from a control sample of stars without planets and their companions. Fourteen stars with planets have space motions that match those of possible stellar moving groups. From these, ten stars with planets share the space velocities of the Hyades moving group and the Pleiades moving group. The estimated ages of stars with planets are for the most part greater than those of the moving groups, suggesting that they are kinematic interlopers. However, HD 1237 and HD 17051 may be true members of the Hyades moving group, and HD 130322 may be a true member of the Pleiades moving group. HD 27442 and HD 92788 have no companions in velocity space except for each other, kinematically appearing as sister stars with planets. Future observational and theoretical tests are required to understand the nature of these candidate kinematic groups.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.