A. J. Maury, N. Ohashi. Ph. Andre
We present 1.3-mm sub-arcsecond SMA observations of the prototypical Class 0
protostar VLA1623. We report the detection of 1.3-mm continuum emission both
from the central protostellar component VLA1623 and two additional sources,
Knot-A and Knot-B, already detected at longer wavelengths. Knot-A and Knot-B
are both located along the western cavity wall opened by the protostellar
outflow from VLA1623. Our SMA observations moreover show that these two
continuum sources are associated with bright, high- velocity 12CO(2-1)
emission, slightly shifted downstream the outflow propagation direction with
respect to the 1.3-mm continuum emission peaks. The alignment of Knot-A and
Knot-B along the protostellar outflow cavity, as well as the compactness of
their 1.3- mm continuum emission and the properties of the associated CO
emission suggest that these two sources are tracing outflow features due to
shocks along the cavity wall, rather than protostellar objects. While it was
considered as one of the best example of close protobinary system so far, the
present analysis suggests that the prototypical Class 0, VLA1623, is single at
scales a > 100 AU probed by our SMA observations. Moreover, we present here the
second robust case of compact millimeter continuum emission produced by
interactions between the protostellar jet and the envelope of a Class 0
protostar, which suggests a high occurrence of these outflow features during
the embedded phase.
View original:
http://arxiv.org/abs/1201.6395
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