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Sub-arcsecond ($0.^{\prime\prime}5$) images of H$_2$CO and CCH line emissionhave been obtained in the $0.8$ mm band toward the low-mass protostar IRAS15398-3359 in the Lupus 1 cloud as one of the Cycle 0 projects of the AtacamaLarge Millimeter/Submillimeter Array. We have detected a compact componentconcentrated in the vicinity of the protostar and a well-collimated outflowcavity extending along the northeast-southwest axis. The inclination angle ofthe outflow is found to be about $20^\circ$, or almost edge-on, based on thekinematic structure of the outflow cavity. This is in contrast to previoussuggestions of a more pole-on geometry. The centrally concentrated component isinterpreted by use of a model of the infalling rotating envelope with theestimated inclination angle, and the mass of the protostar is estimated to beless than $0.09\ M_\odot$. Higher spatial resolution data are needed to inferthe presence of a rotationally supported disk for this source, hinted at by aweak high-velocity H$_2$CO emission associated with the protostar.

A Substellar-Mass Protostar and its Outflow of IRAS 15398-3359 Revealed by Subarcsecond-Resolution Observations of H$_2$CO and CCH