The Super Earths
01- K-11
02- Migrating Worlds
03- Gliese 581
04- Goldilocks
05- 51 Pegasi
06- Doppler Effect
07- Rhythmic Shift
08- Eccentric Giants
09- Transitters
10- Mu Arae
11- Intermediate World
12- Worlds Observed
13- Extra Solar Earths
14- Migrant Worlds
15- Accretion
16- Core Accretion
17- Disk Erosion
18- Planetary Embryos
19- The Protected Zone
20- Ecosphere
21- Ecosphere II
22- Beta Pictoris
23- Vanquishing Starlight
24- Red Edge / Earth Shine
25- Distant Continents
26- The Age of Stars
   

10 - Mu Arae

Click here for larger diagram

 

In contrast, however, to these Roasters, Eccentric Giants and Transitters, a planet orbiting the star Mu Arae, and two others reported at about the same time in 2004, are smaller than their predecessors and could be made largely of rock ( although much larger than Gliese 581).

The planet around Mu Arae weighs at least 14 times as much as the Earth and is scorchingly close to its star, completing an orbit every 9.5 days.

In 2005, a ‘super-Earth’ was found orbiting Gliese 876, 15 light years away in the constellation Aquarius. It has about a third the Sun’s mass, and has two Jupiter-size worlds orbiting it. At the time it was the smallest star known to have planets.

 
  Alan Lambert 2011