Gravitational scattering of ejecta in the Didymos system cannot explain the evolution of the binary's orbital period

Open Access

Fig. 4

Fractional change in the binary's orbital period as a function of the ejecta velocity and Dimorphos's semimajor axis (a) normalized to Didymos's radius (R_didy). The dotted black line is the surface escape speed of Dimorphos, and Dimorphos's actual semimajor axis is ∼3 R_didy.

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