Extrasolar_Planets

Extrasolar_Planets - Search for Extra-Solar Planets Stephen...

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Search for Extra-Solar Planets Stephen Eikenberry 4 November 2010 AST 2037 1
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Planets Around Other Stars None known prior to 1992 (!) In 1992, Alex Wolczan discovered 2 (now 3) planets around a neutron star But those seemed weird Probably supernova leftover bits In 1995, Michel Mayor & Didier Queloz discover a planet around 51 Pegasi – how? 2
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Kepler’s Laws Kepler described 3 “laws” of planetary motion (for our solar system) Kepler did not have a physical basis for the laws (i.e. Newton’s laws of motion) He just found patterns in the motions of planets and used them to develop 3 guidelines that provided a good matching description Newton later used his physical laws of motion to show WHY Kepler’s rules for planet motion worked 3
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Kepler’s First Law Planet orbits are ELLIPSES (what’s that?) The sun/star is at one “focus” of the ellipse Both the planet and the star orbit the center of mass The distance from center to focus is the “eccentricity” Circles are ellipses with eccentricity=0 (both foci at center) 4
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Extrasolar_Planets - Search for Extra-Solar Planets Stephen...

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