0 citations0 references

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

Nature Communications2020Vol. 11(1), pp. 2655–2655

Citations Over TimeTop 1% of 2020 papers

Patrick Michel, Ronald‐Louis Ballouz, O. S. Barnouin, Martin Jutzi, K. J. Walsh, B. May, C. Manzoni, D. C. Richardson, S. R. Schwartz, Seiji Sugita, Sei‐ichiro Watanabe, Hideaki Miyamoto, Masatoshi Hirabayashi, W. F. Bottke, H. C. Connolly, Makoto Yoshikawa, D. S. Lauretta

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.

Related Papers

→ A Theoretical Study of Indentation with an Oblate Spheroid Shape(2016)5 cited
→ XLIII. On the geodesic lines on an oblate spheroid(1870)2 cited
A Study of the Shape Difference between the Level Surfaces of the Oblate Spheroid and the Ellipsoid(2009)
Calculation and Measurement of Diffraction Coefficients of Oblate Spheroid Placed in the Neighborhood of large Oblate Spheroid(2009)
→ A Hollow Oblate Spheroid and an Oblate Spheroid Containing a Penny-Shaped Crack under Axisymmetric Pressure(1981)