Recall the Doppler Method The doppler method of finding planets

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?

A rare find..inner planets

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