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Unformatted text preview: Orbits of Extrasolar planets Most of the detected planets have orbits smaller than Jupiters Planets at greater distances are harder to detect Orbits of some extrasolar planets are much more elongated, greater eccentricity than those in our solar system Nebular theory of planet formation Developed by Kant in 1755 Predicts that massive Jupiter like planets should nto form inside frost line at<< 5 AU Discovery of hot jupiters has forced reexamination of nebular theory Planetary migration or gravitational encounters may explain hot jupiters 55 Cancri Planet Mass and Orbit Tilt We cannot measure an exact mass for a planet without knowing the tilt of its orbit, because Doppler shift tells us only the velocity toward or away from us Doppler data gives us lower limits on masses Planets are opaque Mass + size = density...
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- Fall '07