Extrasolar_Planet_Populations

Extrasolar_Planet_Populations - Extra-Solar Planet...

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Unformatted text preview: Extra-Solar Planet Populations Stephen Eikenberry 4 November 2010 AST 2037 1 Radial Velocity Planet Searches • So … need a speedometer to measure star velocity versus time • To a precision of a few meters per second! • Across distances of many light years!!! 2 • How? Doppler shift of spectral lines 51 Pegasi • In 1995, Mayor & Queloz announce the discovery of an orbital signature with amplitude = 50 m/s in a 4.23- day period around star 51 Pegasi • Mass = 0.5 M JUP ⇒ First extra-solar planet 3 51 Pegasi: Hot Jupiter? • At that location, expected temperature is VERY high (about 2000K or higher!) • So … Jupiter-like planet, but closer than Mercury ⇒ “Hot Jupiter” • How do you make something like that???? 4 Planet Bonanza • Geoff Marcy & Paul Butler quickly confirmed 51 Pegasi • They had lots of archival data from searches for Jupiter-type planets (periods >10 years, so they were still “in progress”) • No on even thought to look for short-period MASSIVE planets (why would they be easier?) • Found many “Hot Jupiters” – most extra-solar planets known today are Hot Jupters 5 ES-Planet Population...
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This note was uploaded on 07/26/2011 for the course AST 2037 taught by Professor Eikenberry during the Fall '08 term at University of Florida.

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Extrasolar_Planet_Populations - Extra-Solar Planet...

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