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Originally Posted by grant hutchison
Tony, I wonder if the fact that Uranus and Neptune were orbiting within a debris disk is relevant here: that has a powerful circularizing effect on orbits, as the planets exchange energy with the disk as well as with each other.
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Yep, here we go. The caption to the first graph in Brunini's letter to Nature includes the following detail of the simulation parameters: "The orbits were circularized as though dynamical friction by the planetesimal disk were operating while the planets were immersed in the planetesimal disk ..."
Grant Hutchison