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ESA announced three discoveries in May 2008, one of which is of a new object—something between a brown dwarf and a planet—named COROT-Exo-3B. It defies classification by current standards. It has nearly 22 times the mass of Jupiter, yet it is approximately the same size as Jupiter. One difficulty in classification is due to its nearness to its parent star. Brown dwarfs aren't ordinarily found this close to another star. But If it is a planet, it would be the densest one known, with a density twice that of lead. Another COROT discovery is of three stars similiar to the Sun, possessing similar oscillations and similar surface granulation.
Yet another discovery of COROT made public in 2009 is of a very small exoplanet—the smallest planet found ouside our Solar System to date. The planet is 1.7 times the size of Earth and orbits a star similar to the Sun. However, it has a very high temperature. Of the more than 400 exoplanets discovered so far, very few have been small and most have been gas giants. This new planet orbits its star once every 20 hours and therefore it is located very close to its stellar parent. Scientists feel this is especially significant because it is the first time a rocky planet has been discovered.
