Is there an exoplanet in the Solar System?

Alexander J., Mustill Sean N. Raymond 1 Melvyn B., Davies 2
1 ECLIPSE 2016
LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac]
Abstract : 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.
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Article dans une revue
Monthly Notices of the Royal Astronomical Society: Letters, Oxford Journals, 2016, 460 (1), pp.L109-L113 〈10.1093/mnrasl/slw075〉
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https://hal.archives-ouvertes.fr/hal-01293594
Contributeur : Marie-Paule Pomies <>
Soumis le : vendredi 25 mars 2016 - 09:29:56
Dernière modification le : mercredi 27 juillet 2016 - 14:48:48

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Alexander J., Mustill, Sean N. Raymond, Melvyn B., Davies. Is there an exoplanet in the Solar System?. Monthly Notices of the Royal Astronomical Society: Letters, Oxford Journals, 2016, 460 (1), pp.L109-L113 〈10.1093/mnrasl/slw075〉. 〈hal-01293594〉

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