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Recall the Doppler Method
The doppler method of finding planets
Allows multiple planets to be discovered
Water Found in system!
Is this Pandora?
Credit: John Whatmough
Credit: John Whatmough (Extrasolar Visions)
First image of extra solar planet (5MJ)
So what have we found So Far? 174 Planets with Semi Major axis less than 0.4 AU (Mercury/sun distance)
42 Planets with Semi Major axis between 0.4 AU and 0.85 (inside sol’s life zone)
65 Planets with Semi Major axis between 0.85 AU and 1.4 (inside sol’s life zone)
140 Planets with Semi Major axis 1.4 AU and 640 AU
But this isn’t the whole story!
Planets near dwarf stars? Planet Name Pl. Mass
Pl. Radius
Pl. Period
Pl. Semi-axis
St. Dist
St. Spec. Type
St. Mass
St. [Fe/H]
St. Radius
GJ 1214 b 0.0179 0.24151.58039
3 0.014 13 0.157 0.211
V391 Peg b 3.2 1170 1.7 1400 sdB 0.5 0.23
Gliese 876 b 2.64 61.067 0.211 4.7 M4 V 0.334 0.05 0.36
Gliese 876 c 0.83 30.258 0.132 4.7 M4 V 0.334 0.05 0.36
Gliese 876 d 0.02 1.93785 0.021 4.7 M4 V 0.334 0.05 0.36
Gl 179 b 0.82 2288 2.41 12.3 M3.5 0.357 0.3 0.38
Gl 581 b 0.0492 5.36874 0.041 6.26 M3 0.31 -0.33 0.38
Gl 581 c 0.01686 12.9292 0.07 6.26 M3 0.31 -0.33 0.38
Gl 581 d0.02231
=7 ME 66.8 0.22 6.26 M3 0.31 -0.33 0.38
Gl 581 e0.00610
4 3.14942 0.03 6.26 M3 0.31 -0.33 0.38
HIP 57050 b 0.298 41.397
0.163506 11 M4V 0.34 0.32 0.4
Note: Me= .003 Mj
A super Earth?
Gliese 876d
Star M3
15 lyrs
Dist= .02 AU
M = 7 ME
Gliese 876 b,c
in 2:1 orbital resonance
Search for Earth like Planets!
• http://www.youtube.com/watch?v=v3Kcw0UrIFI&feature=fvw
What about Other Multiple Planet Systems?
The HD 69830 system
Earth like planets?
• http://www.youtube.com/watch?v=wJXSSYyIVqw&feature=related
• From NatGeo
Gliese 581e 3.5 ME
Project Kepler
• Goal is to find terrestrial planets..
• Views same group of stars continuously
• It works!
• http://www.kepler.arc.nasa.gov/
Where to get more info?
• Future missions
• Summary of results
• How you can participate
• NASA Planet Quest
http://planetquest.jpl.nasa.gov
