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We present line and continuum observations (resolution ~0.3"-3.5") made withthe Atacama Large Millimeter/submillimeter Array (ALMA), Submillimeter Array,and Very Large Array of a young O-type protostar W42-MME (mass: 19-4 Msun). TheALMA 1.35 mm continuum map (resolution ~1") shows that W42-MME is embedded inone of the cores (i.e., MM1) located within a thermally supercriticalfilament-like feature (extent ~0.15 pc) containing three cores (mass ~1-4.4Msun). Several dense/hot gas tracers are detected toward MM1, suggesting thepresence of a hot molecular core with the gas temperature of ~38-220~K. TheALMA 865 micron continuum map (resolution ~0.3") reveals at least fivecontinuum sources/peaks ("A-E") within a dusty envelope (extent ~9000 AU)toward MM1, where shocks are traced in the SiO(8-7) emission. The source "A"associated with W42-MME is seen almost at the center of the dusty envelope, andis surrounded by other continuum peaks. The ALMA CO(3-2) and SiO(8-7) lineobservations show the bipolar outflow extended below 10000 AU, which is drivenby the source "A". The ALMA data hint the episodic ejections from W42-MME. Adisk-like feature (extent ~2000 AU; mass ~1 Msun) with velocity gradients isinvestigated in the source "A" (dynamical mass ~9 Msun) using the ALMA H13CO+emission, and is perpendicular to the CO outflow. A small-scale feature (below3000 AU) probably heated by UV radiation from the O-type star is alsoinvestigated toward the source "A". Overall, W42-MME appears to gain mass fromits disk and the dusty envelope.

The disk-outflow system around the rare young O-type protostar W42-MME