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The luminous blue variable (LBV) RMC143 is located in the outskirts of the30~Doradus complex, a region rich with interstellar material and hot luminousstars. We report the $3\sigma$ sub-millimetre detection of its circumstellarnebula with ALMA. The observed morphology in the sub-millimetre is differentthan previously observed with HST and ATCA in the optical and centimetrewavelength regimes. The spectral energy distribution (SED) of RMC143 suggeststhat two emission mechanisms contribute to the sub-mm emission: optically thinbremsstrahlung and dust. Both the extinction map and the SED are consistentwith a dusty massive nebula with a dust mass of $0.055\pm0.018~M_{\odot}$(assuming $\kappa_{850}=1.7\rm\,cm^{2}\,g^{-1}$). To date, RMC143 has the mostdusty LBV nebula observed in the Magellanic Clouds. We have also re-examinedthe LBV classification of RMC143 based on VLT/X-shooter spectra obtained in2015/16 and a review of the publication record. The radiative transfer codeCMFGEN is used to derive its fundamental stellar parameters. We find aneffective temperature of $\sim 8500$~K, luminosity of log$(L/L_{\odot}) =5.32$, and a relatively high mass-loss rate of $1.0 \times10^{-5}~M_{\odot}$~yr$^{-1}$. The luminosity is much lower than previouslythought, which implies that the current stellar mass of $\sim8~M_{\odot}$ iscomparable to its nebular mass of $\sim 5.5~M_{\odot}$ (from an assumedgas-to-dust ratio of 100), suggesting that the star has lost a large fractionof its initial mass in past LBV eruptions or binary interactions. While thestar may have been hotter in the past, it is currently not hot enough to ionizeits circumstellar nebula. We propose that the nebula is ionized externally bythe hot stars in the 30~Doradus star-forming region.

A massive nebula around the Luminous Blue Variable star RMC143 revealed by ALMA