Spin-up of rubble-pile asteroids: Disruption, satellite formation, and equilibrium shapes

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In search of the source of asteroid (101955) Bennu: Applications of the stochastic YORP model (2015, methodology): “This consistent with the YORP spin up mechanism causing downslope movement, mass shedding, and possibly a satellite in the past (e.g., Walsh et al., 2008, 2012a; Vokrouhlický and Nesvorný, 2008; Pravec et al., 2010; Jacobson and Scheeres, 2011).”
OSIRIS-REx: Sample Return from Asteroid (101955) Bennu (2017, background): “In addition, the nature of asteroid regolith and how it has evolved via collisions, downslope movement, and nongravitational forces is an area of active research (e.g., Walsh et al. 2012; Mazrouei et al. 2014; Rozitis et al. 2014; Sánchez and Scheeres 2014).”
OCAMS: The OSIRIS-REx Camera Suite (2017, background): “…four important feature types: craters, linear features, boulders, and regolith in order to classify Bennu’s surface, as well as revealing its topography sufficiently to understand its geological history (Walsh and Richardson 2006; Delbo and Michel 2011; Walsh et al. 2012, 2013; Connolly 2015).”
Rubble Pile Asteroids (2018, background): “The population of near-Earth asteroids with satellites makes up ~16% of the entire near-Earth asteroid population (Margot et al. 2002, Richardson & Walsh 2006, Margot et al. 2015, Walsh & Jacobson 2015).”