Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011dda....42.0904k&link_type=abstract
American Astronomical Society, DDA meeting #42, #9.04; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The trans-Neptunian object (TNO) Sedna is puzzling because its orbit displays evidence of signicant gravitational perturbations from the local galactic environment even though its proximity to the Sun implies the odds of such perturbations are improbably small. Consequently, many alternative formation scenarios have been proposed. However, new galactic evolution models suggest the Sun's radial position in the Milky Way (and hence its local galactic environment) has varied dramatically during its history. Using numerical simulations that account for this, we demonstrate that it is in fact quite plausible for passing field stars to generate Sedna-like orbits if the Sun was once signicantly closer to the Galactic center. Furthermore, the orbit of Sedna may not be primordial and could have been sculpted Gyrs after solar system formation. For our simulations that generate Sedna analogs, we predict a small population of Sedna-like bodies linking distant Solar System structure with the Sun's migratory history.
Kaib Nathan A.
Quinn Terry
Roškar Rok
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