Extrasolar Planets: A Galactic Perspective

Details Extrasolar Planets: A Galactic Perspective Extrasolar Planets: A Galactic Perspective

2006-08-15

arxiv.org/abs/astro-ph/0608298v1

Astronomy and Astrophysics

Astrophysics

to appear in "A Decade of Extrasolar Planets around Normal Stars", the 2005 STScI May Symposium

Scientific paper

The host stars of extrasolar planets tend to be metal-rich. We have examined the data for these stars for evidence of trends in other galactic parameters, without success. However, several ESP hosts are likely to be members of the thick disk population, indicating that planet formation has occurred throughout the full lifetime of the Galactic disk. We briefly consider the radial metallicity gradient and age-metallicity relation of the Galactic disk, and complete a back-of-the envelope estimate of the likely number of solar-type stars with planetary companions with 6 < R < 10 kpc.

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