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We report the first detection of deuterated water (HDO) toward anextragalactic hot core. The HDO 2$_{11}$-2$_{12}$ line has been detected towardhot cores N105-2A and 2B in the N105 star-forming region in the low-metallicityLarge Magellanic Cloud (LMC) dwarf galaxy with the Atacama LargeMillimeter/submillimeter Array (ALMA). We have compared the HDO line luminosity($L_{\rm HDO}$) measured toward the LMC hot cores to those observed toward asample of seventeen Galactic hot cores covering three orders of magnitude in$L_{\rm HDO}$, four orders of magnitude in bolometric luminosity ($L_{\rmbol}$), and a wide range of Galactocentric distances (thus metallicities). Theobserved values of $L_{\rm HDO}$ for the LMC hot cores fit very well into the$L_{\rm HDO}$ trends with $L_{\rm bol}$ and metallicity observed toward theGalactic hot cores. We have found that $L_{\rm HDO}$ seems to be largelydependent on the source luminosity, but metallicity also plays a role. Weprovide a rough estimate of the H$_2$O column density and abundance rangestoward the LMC hot cores by assuming that HDO/H$_2$O toward the LMC hot coresis the same as that observed in the Milky Way; the estimated ranges aresystematically lower than Galactic values. The spatial distribution andvelocity structure of the HDO emission in N105-2A is consistent with HDO beingthe product of the low-temperature dust grain chemistry. Our results are inagreement with the astrochemical model predictions that HDO is abundantregardless of the extragalactic environment and should be detectable with ALMAin external galaxies.

The Detection of Deuterated Water in the Large Magellanic Cloud with ALMA