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We report ALMA Band 9 continuum observations of the normal, dustystar-forming galaxy A1689-zD1 at $z = 7.13$, resulting in a $\sim$4.6$\sigma$detection at $702$ GHz. For the first time these observations probe the farinfrared (FIR) spectrum shortward of the emission peak of a galaxy in the Epochof Reionization (EoR). Together with ancillary data from earlier works, wederive the dust temperature, $T_{\rm d}$, and mass, $M_{\rm d}$, of A1689-zD1using both traditional modified blackbody spectral energy density fitting, anda new method that relies only on the [CII] $158\ \mathrm{\mu m}$ line andunderlying continuum data. The two methods give $T_{\rm d} = (42^{+13}_{-7},40^{+13}_{-7}$) K, and $M_{\rm d} = (1.7^{+1.3}_{-0.7},2.0^{+1.8}_{-1.0})\,\times{}\,10^{7} \,M_{\odot}$. Band 9 observations improvethe accuracy of the dust temperature (mass) estimate by $\sim 50$% (6 times).The derived temperatures confirm the reported increasing $T_{\rm d}$-redshifttrend between $z=0$ and $8$; the dust mass is consistent with a supernovaorigin. Although A1689-zD1 is a normal UV-selected galaxy, our results,implying that $\sim$85% of its star formation rate is obscured, underline thenon-negligible effects of dust in EoR galaxies.

Accurate dust temperature determination in a $z = 7.13$ galaxy