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Neptune's capture of its moon Triton in a binary-planet gravitational encounter.

Abstract：

:Triton is Neptune's principal satellite and is by far the largest retrograde satellite in the Solar System (its mass is approximately 40 per cent greater than that of Pluto). Its inclined and circular orbit lies between a group of small inner prograde satellites and a number of exterior irregular satellites with both prograde and retrograde orbits. This unusual configuration has led to the belief that Triton originally orbited the Sun before being captured in orbit around Neptune. Existing models for its capture, however, all have significant bottlenecks that make their effectiveness doubtful. Here we report that a three-body gravitational encounter between a binary system (of approximately 10(3)-kilometre-sized bodies) and Neptune is a far more likely explanation for Triton's capture. Our model predicts that Triton was once a member of a binary with a range of plausible characteristics, including ones similar to the Pluto-Charon pair.

journal_name

Nature

journal_title

Nature

authors

Agnor CB,Hamilton DP

doi

10.1038/nature04792

subject

Has Abstract

pub_date

2006-05-11 00:00:00

pages

192-4

issue

7090

eissn

0028-0836

issn

1476-4687

pii

nature04792

journal_volume

441

pub_type

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