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Studies of transiting extra-solar planets are of key importance forunderstanding the nature of planets outside our Solar System, because theirdensities can be determined, constraining of what the planets are made of.Using the data obtained by the CoRoT space telescope we study the relationbetween the density of planets, their mass, and the mass of their host stars.Although planets of the same mass can have different densities, we still findsome trends. Planets with more than 1000 MEarth (about 3 MJup have densitieslarger than 6 gcm-3, and are preferentially found in stars that are moremassive than the Sun. All known planets in the mass-range between 15 and 600MEarth (about 0.05 to 2 MJup) have densities of less than 3 gcm-3. When goingfurther down in the mass of the planets, the density increases steadily, andthere is no sudden transition from gaseous to rocky planets. Based on thecurrent sample, we do not find any difference for planets at differentgalactocentric distances.

The Densities of Planets and the Masses of Host Stars