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We report the first interferomteric detection of 183 GHz water emission inthe low-mass protostar Serpens SMM1 using the Submillimeter Array with aresolution of 3$"$ and rms of $\sim$7 Jy in a 3 km s$^{-1}$ bin. Due to thesmall size and high brightnessof more than 240 Jy/beam, it appears to be maseremission. In total three maser spots were detected out to $\sim$ 700 AU fromthe central protostar, lying along the red-shifted outflow axis, outside thecircumstellar disk but within the envelope region as evidenced by the continuummeasurements. Two of the maser spots appear to be blue-shifted by about 1 to 2km s$^{-1}$. No extended or compact thermal emission from a passively heatedprotostellar envelope was detected with a limit of 7 Jy (16 K), in agreementwith recent modelling efforts. We propose that the maser spots originate withinthe cavity walls due to the interaction of the outflow jet with the surroundingprotostellar envelope. Hydrodynamical models predict that such regions can bedense and warm enough to invert the 183 GHz water transition.

183 GHz H$_2$O maser emission around the low-mass protostar Serpens SMM1