A recent article has a rather decent discussion relative to exoplanet Kepler-10c, which is 17 times heavier than Earth, and is 2.3 times the size of Earth. Maybe the most significant statement is, "K10c has positive implications for life"!!! It is about 560 light years from Earth.
The discovery of Kepler-10c was presented at the 224th American Astronomical society meeting, June 2, 2014.
http://www.foxnews.com/science/2014/06/02/godzilla-earths-alien-planet-17-times-heavier-than-our-world-discovered/