Extrasolar_Planet_Populations

Extrasolar_Planet_Populations - Extra-Solar Planet...

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Extra-Solar Planet Populations Stephen Eikenberry 4 November 2010 AST 2037 1
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Radial Velocity Planet Searches So … need a speedometer to measure star velocity versus time o a precision of a fe meters per second! To a precision of a few meters per second! Across distances of many light years!!! How? Doppler shift pp of spectral lines 2
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51 Pegasi In 1995, Mayor & Queloz announce the discovery of an orbital signature with amplitude = 50 m/s in a 4.23- ay period around star 51 Pegasi day period around star 51 Pegasi Mass = 0.5 M JUP First extra-solar planet 3
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51 Pegasi: Hot Jupiter? At that location, expected temperature is VERY igh (about 2000K or high (about 2000K or higher!) So … Jupiter-like planet, tl th M but closer than Mercury “Hot Jupiter” How do you make something like that???? 4
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Planet Bonanza Geoff Marcy & Paul Butler quickly confirmed 51 Pegasi They had lots of archival data from searches for y Jupiter-type planets (periods >10 years, so they were still “in progress”) o on even thought to look for short eriod MASSIVE No on even thought to look for short-period MASSIVE planets (why would they be easier?) Found many “Hot Jupiters” – most extra-solar planets t d H t J t known today are Hot Jupters 5
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Extrasolar_Planet_Populations - Extra-Solar Planet...

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