MUSTILL, Alexander J.,; RAYMOND, Sean N.; DAVIES, Melvyn B.,

doi:10.1093/mnrasl/slw075

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MUSTILL, Alexander J.,

RAYMOND, Sean N.
ECLIPSE 2016

DAVIES, Melvyn B.,
University of Cape Town

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Monthly Notices of the Royal Astronomical Society: Letters. 2016-03, vol. 460, n° 1, p. L109-L113

Oxford Journals

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We investigate the prospects for the capture of the proposed Planet 9 from other stars in the Sun's birth cluster. Any capture scenario must satisfy three conditions: the encounter must be more distant than ~150 au to avoid perturbing the Kuiper belt; the other star must have a wide-orbit planet (a>~100au); the planet must be captured onto an appropriate orbit to sculpt the orbital distribution of wide-orbit Solar System bodies. Here we use N-body simulations to show that these criteria may be simultaneously satisfied. In a few percent of slow close encounters in a cluster, bodies are captured onto heliocentric, Planet 9-like orbits. During the ~100 Myr cluster phase, many stars are likely to host planets on highly-eccentric orbits with apastron distances beyond 100 au if Neptune-sized planets are common and susceptible to planet--planet scattering. While the existence of Planet 9 remains unproven, we consider capture from one of the Sun's young brethren a plausible route to explain such an object's orbit. Capture appears to predict a large population of Trans-Neptunian Objects (TNOs) whose orbits are aligned with the captured planet, and we propose that different formation mechanisms will be distinguishable based on their imprint on the distribution of TNOs.< Réduire

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Astrophysics - Earth and Planetary Astrophysics

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Is there an exoplanet in the Solar System?

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