Extrasolar Planets - common center of mass The Sun actually...

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Extrasolar Planets Over 500 detected so far…. Over 1200 “Candidates” detected…. We have “seen” none of them yet Count as of February 15, 2010 528 planets 439 planetary systems 54 multiple planetary systems Note: 1 Jupiter mass = 318 Earth masses Methods Radial Velocity or Doppler Spectroscopy Transit Photometry How Many???? About 10% of the stars we have checked have at least one giant planet. There are about 100 billion stars in our galaxy.
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As a result, there should be about 10 billion planets in our galaxy. Types of planets : mostly strange Big…. Close to their Sun…. Gravitational Wobble: The solar system’s planets AND the Sun actually orbit around a
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Unformatted text preview: common center of mass The Sun actually appears to wobble from its orbit around the systems common center. Doppler Spectroscopy (or radial velocity): detects the periodic velocity shift of the stellar spectrum caused by an orbiting planet. Most successful current method From ground-based observatories we can measure about 3 m/s of Doppler shift This works out to a minimum detectable mass of 33 Earth masses for a planet at 1 AU from a one solar-mass (1 Mo) star A plot of the radial velocity shifts forms a wave. Its wavelength tells you the period and size of the planets orbit. Its amplitude tells you the mass of the planet....
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This note was uploaded on 09/12/2011 for the course AST 2002 taught by Professor Britt during the Spring '08 term at University of Central Florida.

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Extrasolar Planets - common center of mass The Sun actually...

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