The interstellar object 'Oumuamua as a fractal dust aggregate
In: ISSN: 2041-8205, 2019
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academicJournal
Zugriff:
International audience ; 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.
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The interstellar object 'Oumuamua as a fractal dust aggregate
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Autor/in / Beteiligte Person: | Flekkøy, Eirik ; Luu, Jane ; Toussaint, Renaud ; University of Oslo (UiO) ; Institute of Theoretical Astrophysics Oslo ; Institut de physique du globe de Strasbourg (IPGS) ; Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) |
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Zeitschrift: | ISSN: 2041-8205, 2019 |
Veröffentlichung: | HAL CCSD ; IOP Publishing, 2019 |
Medientyp: | academicJournal |
ISSN: | 2041-8205 |
DOI: | 10.3847/2041-8213/ab4f78 |
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