  We report on the discovery of an infrared jet from a deeply embedded infrared
counterpart of 6.7 GHz methanol maser emission (MME) in W42 (i.e. W42-MME). We
also investigate that W42-MME drives a parsec-scale H2 outflow, with detection
of bow shock feature at ~0.52 pc to the north. The inner ~0.4 pc part of the H2
outflow has a position angle of ~18 deg and the position angle of ~40 deg is
found farther away on either side of outflow from W42-MME. W42-MME is detected
at wavelengths longer than 2.2 microns and is a massive young stellar object,
with the estimated stellar mass of 19+-4 Msun. We map the inner circumstellar
environment of W42-MME using VLT/NACO adaptive optics Ks and L' observations at
resolutions ~0.2 arcsec and ~0.1 arcsec, respectively. We discover a collimated
jet in the inner 4500 AU using the L' band, which contains prominent Br alpha
line emission. The jet is located inside an envelope/cavity (extent ~10640 AU)
that is tapered at both ends and is oriented along the north-south direction.
Such observed morphology of outflow cavity around massive star is scarcely
known and is very crucial for understanding the jet-outflow formation process
in massive star formation. Along the flow axis, which is parallel to the
previously known magnetic field, two blobs are found in both the NACO images at
distances of ~11800 AU, located symmetrically from W42-MME. The observed
W42-MME jet-outflow configuration can be used to constrain the jet launching
and jet collimation models in massive star formation.
