Prsentation PowerPoint

1
Jean-Pierre needs to be brought up to date on
whats really going on in astronomy these days!
2
Extrasolar Planets
Caroline Terquem Institut dAstrophysique de
Paris Université Paris 6
3
Detection of extrasolar planets
4
1995 First extrasolar planet around a solar
like star
inner solar system
51 Pegasi
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249 planets 25 multiple systems (October 11,
2007) http//exoplanet.eu/
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Masses of extrasolar planets
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mass vs semi-major axis
10
1
Planet mass (Jupiter mass)
0.1
0.01
0.01
0.1
1
10
Semi-major axis (UA)
8
eccentricity vs mass
Eccentricity
0.01
0.1
1
10
100
Mass (Jupiter mass)
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Giant planet formation
Accretion of a core Capture of a gaseous envelope
? Critical core mass
10
Planet migration

• Hot Jupiter and Neptunes
• in situ formation
• too hot
• not enough material

• Resonant planets
• capture

11
Tidal torques
(Goldreich Tremaine 79)
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Type I migration
(Goldreich Tremaine, Ward)
13
Type I migration
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Type II migration
(Goldreich Tremaine, Papaloizou Lin)
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Type II migration
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Disk-planet interaction
Geoff Bryden
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Migration rate
2D
3D
(Bate et al. 03)
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Planets around pulsars
3 planets resonance (32), with e 0 ?
formation in a disk
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Planets around pulsars
A. Wolszczan D. Frail, 1992

• Can a planet survive the supernova explosion?
• Red giant phase the planet may be engulfed by
  the star

• Supernova explosion
• Mass loss if more than half the stellar mass
  is lost,
• the planet escapes
• Shock wave if Ekinetic Ebinding, the planet
  is destroyed
• Ekinetic E?pRp2/(4pD2) with E1051 ergs
• Ebinding -GMp2/Rp -10-2 Ec ? ???

20
Conclusions
Come back in a few years.
(Maybe there will be some for Jean-Pierres 70th
birthday.)