Temperature variation at different latitudes of a non phase-locked CoRoT-7b, with a hypothetical day of 10.2 h (half the orbital period of the planet). As the planet is rotating, we can use the time or the longitude on the abscissa. Here, the zero on the time axis corresponds to noon. Each curve represents the temperature at a given latitude (from 0 to 85, with a step of 5°). The plateau at Tfusion = 2300 K is due to the extra energy needed to overpass the latent heat at the threshold of the melting temperature. We can interpret this graph like this for a point which is at low latitude: the rock melts around 1.5 h before noon and so the lava ocean appears; it fully goes back to solid state more than 2 h after noon. The extension of the lava ocean is ± 60° in latitude.
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