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We suggest that accretion of planet-bound dark matter by the Jovian planets,and by hot-Jupiter exoplanets, could be a significant source of their internalheat. The anomalously low internal heat of Uranus would then be explained ifthe collision believed to have tilted the axis of Uranus also knocked it freeof most of its associated dark matter cloud. Our considerations focus on theefficient capture of non-self-annihilating dark matter, but could also apply toself-annihilating dark matter, provided the capture efficiency is small enoughthat the earth heat balance constraint is obeyed.

Planet-bound dark matter and the internal heat of Uranus, Neptune, and hot-Jupiter exoplanets