Kavli Affiliate: Gregory J. Herczeg
| First 5 Authors: Seokho Lee, Jeong-Eun Lee, Doug Johnstone, Gregory J. Herczeg, Yuri Aikawa
| Summary:
We present the outflows detected in HOPS 373SW, a protostar undergoing a
modest $30%$ brightness increase at 850 $mu$m. Atacama Large
Millimeter/submillimeter Array (ALMA) observations of shock tracers, including
SiO 8–7, CH$_3$OH 7$_{rm k}$–6$_{rm k}$, and $^{12}$CO 3–2 emission,
reveal several outflow features around HOPS 373SW. The knots in the extremely
high-velocity SiO emission reveal the wiggle of the jet, for which a simple
model derives a 37$^circ$ inclination angle of the jet to the plane of the
sky, a jet velocity of 90 km s$^{-1}$, and a period of 50 years. The slow SiO
and CH$_3$OH emission traces U-shaped bow shocks surrounding the two CO
outflows. One outflow is associated with the high-velocity jets, while the
other is observed to be close to the plane of the sky. The misaligned outflows
imply that previous episodic accretion events have either reoriented HOPS 373SW
or that it is an unresolved protostellar binary system with misaligned
outflows.
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