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The interstellar object ’Oumuamua as a fractal dust aggregate

Flekkøy, Eirik Grude; Luu, Jane; Toussaint, Renaud
Journal article; PublishedVersion; Peer reviewed
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Flekk%C3%B8y_2019_ApJL_885_L41.pdf (359.9Kb)
Year
2019
Permanent link
http://urn.nb.no/URN:NBN:no-79263

CRIStin
1777252

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  • Institutt for geofag [1325]
  • Fysisk institutt [2257]
  • Det matematisk-naturvitenskapelige fakultet [246]
  • Institutt for teoretisk astrofysikk [687]
  • CRIStin høstingsarkiv [15063]
Original version
Astrophysical Journal Letters. 2019, 885 (2):L41, DOI: https://doi.org/10.3847/2041-8213/ab4f78
Abstract
The first known interstellar object 'Oumuamua exhibited a nongravitational acceleration that appeared inconsistent with cometary outgassing, leaving radiation pressure as the most likely force. Barring the alien lightsail hypothesis, an ultra-low density due to a fractal structure might also explain the acceleration of 'Oumuamua by radiation pressure. In this Letter 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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