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Fig. 2


Habitable zone (HZ) of a Mars-sized moon around a Jupiter-mass (light green) and a β Pic b-like 11 MJ-mass (dark green) planet at 5 AU from a Sun-like star. Inside the green areas, tidal heating plus planetary illumination can liquify water on the moon surface. Values of the Galilean moons are denoted by their initials. Left: both HZs refer to a planet at an age of 10 Myr, where planetary illumination is significant. Right: both HZs refer to a planet at an age of 1 Gyr, where planetary illumination is weak and tidal heating is the dominant energy source on the moon.

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