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Voyager 2 observations revealed that the internal luminosity of Neptune is anorder of magnitude higher than that of Uranus. If the two planets have similarinterior structures and cooling histories, the luminosity of Neptune can onlybe explained by invoking some energy source beyond gravitational contraction.This paper investigates whether Centaur impacts could provide the energynecessary to produce the luminosity of Neptune. The major findings are (1) thatimpacts on both Uranus and Neptune are too infrequent to provide luminositiesof order the observed value for Neptune, even for optimistic impact-rateestimates, and (2) that Uranus and Neptune rarely have significantly differentimpact-generated luminosities at any given time. Uranus and Neptune most likelyhave structural differences that force them to cool and contract at differentrates.

Assessing the contribution of Centaur impacts to ice giant luminosities