Nuclear heating rates of the explored parameter space, colours label Ye-values. Overlaid are bolometric lu- minosities computed following the description in Kasliwal et al. (2017) using updated photometry from https://kilonova.space (yellow circles). We show the total nuclear heating rate (luminosities divided by an ejecta mass of 1.5 × 10−2 M⊙). Also shown is the heating rate of a wind with Ye = 0.5 that produces a substantial amount of nickel, see last panel in Fig. 2. The close agreement with Ye ≲ 0.3 strongly suggests the presence of substantial amounts of r-process matter.
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