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001047342 1001_ $$0P:(DE-Juel1)177668$$aPfalzner, Susanne$$b0$$eCorresponding author
001047342 245__ $$aTrans-Neptunian Object Colors as Evidence for a Past Close Stellar Flyby to the Solar System
001047342 260__ $$aLondon$$bInstitute of Physics Publ.$$c2025
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001047342 520__ $$aThousands of small bodies, known as trans-Neptunian objects (TNOs), orbit the Sun beyond Neptune. TNOs are remnants of the planets’ formation from a disk of gas and dust, so it is puzzling that they move mostly on eccentric orbits inclined to the planetary plane and show a complex red-to-gray color distribution. A close stellar flyby can account for the TNOs’ dynamics, but it is unclear if this can also explain the correlation between their colors and orbital characteristics. Assuming an initial red-to-gray color gradient in the disk, our numerical study finds that the spiral arms induced by the stellar flyby simultaneously lead to the observed TNOs’ color patterns and orbital dynamics. The combined explanation of these TNO properties strengthens the evidence for a close flyby of another star to the young solar system. Our study predicts that (1) small TNOs beyond 60 au will mostly be gray, and (2) retrograde TNOs will lack the color most common to high-inclination TNOs. The anticipated TNO discoveries by the Vera Rubin telescope will be able to test these predictions. A confirmed flyby would allow us to reveal the chemical composition of the solar system’s primordial disk.
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001047342 7001_ $$0P:(DE-Juel1)184382$$aWagner, Frank W.$$b1
001047342 7001_ $$0P:(DE-Juel1)132115$$aGibbon, Paul$$b2
001047342 773__ $$0PERI:(DE-600)2006858-X$$a10.3847/2041-8213/ae0e74$$gVol. 992, no. 2, p. L32 -$$n2$$pL32 -$$tThe astrophysical journal / Part 2$$v992$$x2041-8205$$y2025
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