Collisional formation of top-shaped asteroids and implications for the origins of Ryugu and Bennu

P. Michel; R. L. Ballouz; O. S. Barnouin; M. Jutzi; K. J. Walsh; B. H. May; C. Manzoni; D. C. Richardson; S. R. Schwartz; S. Sugita; S. Watanabe; H. Miyamoto; M. Hirabayashi; W. F. Bottke; H. C. Connolly; M. Yoshikawa; D. S. Lauretta

doi:10.1038/s41467-020-16433-z

Collisional formation of top-shaped asteroids and implications for the origins of Ryugu and Bennu

P. Michel, R. L. Ballouz, O. S. Barnouin, M. Jutzi, K. J. Walsh, B. H. May, C. Manzoni, D. C. Richardson, S. R. Schwartz, S. Sugita, S. Watanabe, H. Miyamoto, M. Hirabayashi, W. F. Bottke, H. C. Connolly, M. Yoshikawa, D. S. Lauretta

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92 Scopus citations

Abstract

Asteroid shapes and hydration levels can serve as tracers of their history and origin. For instance, the asteroids (162173) Ryugu and (101955) Bennu have an oblate spheroidal shape with a pronounced equator, but contain different surface hydration levels. Here we show, through numerical simulations of large asteroid disruptions, that oblate spheroids, some of which have a pronounced equator defining a spinning top shape, can form directly through gravitational reaccumulation. We further show that rubble piles formed in a single disruption can have similar porosities but variable degrees of hydration. The direct formation of top shapes from single disruption alone can explain the relatively old crater-retention ages of the equatorial features of Ryugu and Bennu. Two separate parent-body disruptions are not necessarily required to explain their different hydration levels.

Original language	English (US)
Article number	2655
Journal	Nature communications
Volume	11
Issue number	1
DOIs	https://doi.org/10.1038/s41467-020-16433-z
State	Published - Dec 1 2020

ASJC Scopus subject areas

General Chemistry
General Biochemistry, Genetics and Molecular Biology
General Physics and Astronomy

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Michel, P., Ballouz, R. L., Barnouin, O. S., Jutzi, M., Walsh, K. J., May, B. H., Manzoni, C., Richardson, D. C., Schwartz, S. R., Sugita, S., Watanabe, S., Miyamoto, H., Hirabayashi, M., Bottke, W. F., Connolly, H. C., Yoshikawa, M., & Lauretta, D. S. (2020). Collisional formation of top-shaped asteroids and implications for the origins of Ryugu and Bennu. Nature communications, 11(1), Article 2655. https://doi.org/10.1038/s41467-020-16433-z

Michel, P, Ballouz, RL, Barnouin, OS, Jutzi, M, Walsh, KJ, May, BH, Manzoni, C, Richardson, DC, Schwartz, SR, Sugita, S, Watanabe, S, Miyamoto, H, Hirabayashi, M, Bottke, WF, Connolly, HC, Yoshikawa, M & Lauretta, DS 2020, 'Collisional formation of top-shaped asteroids and implications for the origins of Ryugu and Bennu', Nature communications, vol. 11, no. 1, 2655. https://doi.org/10.1038/s41467-020-16433-z

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abstract = "Asteroid shapes and hydration levels can serve as tracers of their history and origin. For instance, the asteroids (162173) Ryugu and (101955) Bennu have an oblate spheroidal shape with a pronounced equator, but contain different surface hydration levels. Here we show, through numerical simulations of large asteroid disruptions, that oblate spheroids, some of which have a pronounced equator defining a spinning top shape, can form directly through gravitational reaccumulation. We further show that rubble piles formed in a single disruption can have similar porosities but variable degrees of hydration. The direct formation of top shapes from single disruption alone can explain the relatively old crater-retention ages of the equatorial features of Ryugu and Bennu. Two separate parent-body disruptions are not necessarily required to explain their different hydration levels.",

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AU - Sugita, S.

AU - Watanabe, S.

AU - Miyamoto, H.

AU - Hirabayashi, M.

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Collisional formation of top-shaped asteroids and implications for the origins of Ryugu and Bennu

Abstract

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