  We present bispectrum speckle interferometry and speckle polarimetry of the
deeply embedded infrared bipolar outflow source S140 IRS1, a massive
protostellar object in the L1204 molecular cloud. Using the SAO 6 m telescope,
we obtained 280 mas resolution polarization maps of S140 IRS1 as well as a
K-band image with diffraction-limited resolution lambda/D of 76 mas, which is
the highest angular resolution image of a young outflow source ever obtained in
the infrared. Our data suggest that the central source is marginally resolved
with a FWHM diameter of approximately 20 mas (~ 20 AU). The most remarkable
feature in our image is a bright extended and very clumpy structure pointing
away from the central source in exactly the same direction as the blue-shifted
CO outflow lobe. A centro-symmetric pattern of high polarization in this
feature suggests that we see scattered light from the central source. We
interprete this feature as the clumpy inner surface of a partially evacuated
cavity in the circumstellar envelope around IRS1, which has been excavated by
the strong outflow from IRS1.
