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Fig. 1


Oblateness given by Eq. (36) as a function of the rotation period (in days) at 1 Gyr for planets of mass: 0.3 MJ (dotted), 0.5 MJ (dashed), 1 MJ (dash-dotted), 3 MJ (long dashed), 15 MJ(solid). The oblateness decreases when the mass of the planet increases because massive objects are more compressible (see Sect. 4), have a more intense self-gravity field and are thus less subject to perturbations.

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