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The search for rocky exoplanets plays an important role in our quest for extra-terrestrial life. Here, we discuss the extreme physical properties possible for the first characterised rocky super-Earth, CoRoT-7b (R pl =1.58±0.10R Earth , M pl =6.9±1.2M Earth ). It is extremely close to its star (a=0.0171AU=4.48R st ), with its spin and orbital rotation likely...
Planets less massive than about 10 MEarth are expected to have no massive H–He atmosphere and a cometary composition (∼50% rocks, 50% water, by mass) provided they formed beyond the snowline of protoplanetary disks. Due to inward migration, such planets could be found at any distance between their formation site and the star. If migration stops within the habitable zone, this may produce a new kind...
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