Case of a Pluto-mass body shattered at 30 AU around an A7V star, as observed from 30 pc. Left: SED of the integrated system, as estimated with the GRaTer package at 7 × 10⁴ years after the breakup. The full line represents the total (stellar photosphere + disc) luminosity, while the dashed line represents the sole contribution of the dust disc and the dotted one is that of the stellar photosphere. Right: evolution of the disc-integrated flux at 24 μm, as computed with GRaTer (solid line). The dashed line marks a dust to star flux ratio equal to 0.1 taken as our detectability criteria.