The interstellar object 'Oumuamua as a fractal dust aggregate
2019
Online
report
Zugriff:
The first known interstellar object 'Oumuamua exhibited a nongravitational acceleration that appeared inconsistent with cometary outgassing, leaving radiation pressure as the most likely force. Bar the alien lightsail hypothesis, an ultra-low density due to a fractal structure might also explain the acceleration of 'Oumuamua by radiation pressure (Moro-Martin 2019). In this paper we report a decrease in 'Oumuamua's rotation period based on ground-based observations, and show that this spin-down can be explained by the YORP effect if 'Oumuamua is indeed a fractal body with the ultra-low density of $10^{-2}$ kg m$^{-3}$. We also investigate the mechanical consequences of 'Oumuamua as a fractal body subjected to rotational and tidal forces, and show that a fractal structure can survive these mechanical forces.
Comment: 8 pages, 3 figures
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The interstellar object 'Oumuamua as a fractal dust aggregate
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Autor/in / Beteiligte Person: | Flekkøy, Eirik G. ; Luu, Jane X. ; Toussaint, Renaud |
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Veröffentlichung: | 2019 |
Medientyp: | report |
DOI: | 10.3847/2041-8213/ab4f78 |
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