L22GH09Extrasolar_Planets_Results

L22GH09Extrasolar_Planets_Results - Extrasolar planets:...

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March 31, 2009 Extrasolar planets-results Extrasolar planets: results
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March 31, 2009 Extrasolar planets-results Extrasolar Planets - Topics •Results ¾ What types of planets have been found? (mass -terrestrial, jovian…) ¾ What kinds of orbits? (e, i, a) ¾ How do results depend on ± Method ± Type of star etc… ¾ Relevance of Habitable zone • Implications, future… ¾ Relevance to planetary system formation models ¾ Habitable zone distribution? ¾ Is our SS unique? Just unusual? Ordinary?
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March 31, 2009 Extrasolar planets-results Detection methods - reminder 1. Pulsar timing 2. Astrometric wobble 3. Radial velocities 4. Gravitational lensing 5. Transits 6. Dust disks 7. Direct detection two interesting websites: http://exoplanets.org/ http://exoplanet.eu/ …and many others
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March 31, 2009 Extrasolar planets-results Extrasolar planet searches •as of March 2009, 344 exoplanets have been detected •most have a<1 AU, masses >M Jupiter, , eccentric orbits •vast majority found from radial velocity observations
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March 31, 2009 Extrasolar planets-results Extrasolar Planets Detected . ..so far Method # planetary systems # planets #multiple planet systems radial velocity 272* (249)** 318 (290) 33 (29) transits*** 58 (52) 58 (52) microlensing 78 (7) 1 imaging 91 1 (5) 1 timing 4 (3) 7 (5) 2 (1) Total to date 344 (307) *** transit candidates selected from systems detected by radial velocity * data as of March 23, 2009; ** data as of July 16, 2008
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March 31, 2009 Extrasolar planets-results timing: results > 7 planets in four systems > all at very small angular distance from star > two in an eclipsing binary system – eclipse timing ! star/planet period mass a (AU) e i (º) ang sep (“) PSR1257+12 b 25d 7x10 -5 M E 0.19 0.0 -- 0.0006 c 66d 4.3M E 0.36 0.019 53 0.001 d 98d 4.3M E 0.46 0.025 47 0.0015 V391Peg b 1170d >3.2M J 1.7 0.0 ? <0.001 HWVir b 5767 19.2M J -- HWVir c 3321 8.5M J -- PSRB1620-26 c 100y ~2.5M J 23 low ? 0.006
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March 31, 2009 Extrasolar planets-results Pulsar timing: PSR 1257+12 Second extrasolar planet system Discovered in 1992 (Canadian. ..) PSR1257+12 has three Earth-mass planets and one “comet” How did they survive the supernova? Are they rocky cores of gas giants? Planets created as a result of supernova?? Kuiper belt present?
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March 31, 2009 Extrasolar planets-results Pulsar timing: PSR B1620-26 PSR 1620-26 is a binary star system: the pulsar and a white dwarf And in the centre of the globular cluster M4 Example of capture after SN event?
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March 31, 2009 Extrasolar planets-results Astrometric wobble: reminder observe cyclic change in motion of a star due to its motion around a
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This note was uploaded on 04/15/2009 for the course PHYS 275 taught by Professor Harris during the Winter '09 term at Waterloo.

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L22GH09Extrasolar_Planets_Results - Extrasolar planets:...

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