Morphology of the contact discontinuity. Maps on the left are spherical projections of the radial variations of the location of the wave. We use the Mollweide projection; for all times it is centered on the dipole component at the initial time. Spectra on the right result from an expansion in spherical harmonics of these variations. At angular wavenumber ℓ, the typical angular scale probed is π/ℓ, and the power C _ℓ plotted is normalized in such a way that each grayed bin is the contribution of wavenumber ℓ to the total variance of the radial fluctuations. Three times are shown: 1 yr, 100 yr, 500 yr. The maps and spectra evolve slowly after that. An animated version of this figure is available online, showing the evolution from 1 yr to 4000 yr by steps of 1 yr (the duration is 1 minute 20 s). The first plot is a color-coded mask to aid in identifying the origin of the features: red = regular ejecta, green cone = shadow from the companion, blue cylinder = tail from the first detonation. These masks are shown at t = 1 yr.

(An animation of this figure is available.)

The video/animation of this figure is available in the online journal.