Planet–planet scattering in the upsilon Andromedae system

Eric B. Ford, Verene Lystad and Frederic A. Rasio ()
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Eric B. Ford: University of California
Verene Lystad: Northwestern University
Frederic A. Rasio: Northwestern University

Nature, 2005, vol. 434, issue 7035, 873-876

Abstract: Eccentric behaviour The planets of our Solar System are all in nearly circular orbits, as expected of the products of coagulation and accretion in a protostellar disk. Yet most of the 150-plus extrasolar planets so far detected around nearby stars are in eccentric orbits. Observations of the three giant planets around upsilon Andromedae — the ‘Rosetta stone’ of planetary dynamics — suggest that these orbital eccentricities can be explained if the planets start life in nearly circular orbits and are later perturbed by interaction with another planet now lost from the system. The study of orbital eccentricity is relevant to models of planet formation, and to astronomers interested in the extent of the so-called habitable zones of terrestrial planets.

Date: 2005
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DOI: 10.1038/nature03427

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