An interstellar origin for Jupiter’s retrograde co-orbital asteroid

Abstract Asteroid (514107) 2015 BZ509 was discovered recently in Jupiter’s co-orbital region with a retrograde motion around the Sun. The known chaotic dynamics of the outer Solar system have so far precluded the identification of its origin. Here, we perform a high-resolution statistical search for...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society. Letters 2018-06, Vol.477 (1), p.L117-L121
Hauptverfasser: Namouni, F, Morais, M H M
Format: Artikel
Sprache:eng
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Zusammenfassung:Abstract Asteroid (514107) 2015 BZ509 was discovered recently in Jupiter’s co-orbital region with a retrograde motion around the Sun. The known chaotic dynamics of the outer Solar system have so far precluded the identification of its origin. Here, we perform a high-resolution statistical search for stable orbits and show that asteroid (514107) 2015 BZ509 has been in its current orbital state since the formation of the Solar system. This result indicates that (514107) 2015 BZ509 was captured from the interstellar medium 4.5 billion years in the past as planet formation models cannot produce such a primordial large-inclination orbit with the planets on nearly coplanar orbits interacting with a coplanar debris disc that must produce the low-inclination small-body reservoirs of the Solar system such as the asteroid and Kuiper belts. This result also implies that more extrasolar asteroids are currently present in the Solar system on nearly polar orbits.
ISSN:1745-3925
1745-3933
1745-3933
DOI:10.1093/mnrasl/sly057