Early planet formation as a trigger for further planet formation

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Abstract

Recent discoveries of extrasolar giant planets at small orbital radii1,2, or having significant orbital eccentricities, suggest that the planets interacted with the disks of dust and gas from which they and the central stars formed3,4,5,6. Here we show that if a gas-giant planet reaches a mass of 4–5 jovian masses sufficiently early, when the protoplanetary disk is still massive, an otherwise stable disk will fragment into additional planetary bodies. This process of catastrophic planet formation could account for the apparent difference1 in the distribution of the masses of massive planets and brown dwarfs around other stars, and the existence of young stars that appear to have dissipated their disks at a very early age7. Subsequent gravitational interactions5,6,8,9 between the first planet to form and the additional planets could lead to planetary systems comprising a small number of massive planets in eccentric orbits.

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Figure 1: The evolution of the disk surface density, with and without an embedded massive planet.
Figure 2: The gravitational potential fluctuations in the disk at angle ϕ at the inner Lindblad resonance where fragmentation first occurs.

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Acknowledgements

We thank N. Murray for helpful discussions, and N. Wilson for maintaining the required computational resources.

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Correspondence to Philip J. Armitage.

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Armitage, P., Hansen, B. Early planet formation as a trigger for further planet formation. Nature 402, 633–635 (1999) doi:10.1038/45179

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