OMC-2 FIR 6b B?

OMC 2/FIR 6b is a protostar in Orion Molecular Cloud showing interaction with a substellar companion in eccentric orbit. The host star was a little difficult to retrieve but here it is: [MWZ90] OMC-2 FIR 6b or HOPS 60.

A twin-jet structure rather than jet-rotation in the young stellar object OMC 2/FIR 6b

Quote :

I analyse recent high-quality observations of the northeast jet of the young stellar object (YSO) OMC 2/FIR 6b (HOPS-60) and find that the observations are much more likely to indicate a twin-jet structure than jet-rotation. In the twin-jets structure the main jet is composed of two very close narrower jets that were launched at about the same time by the central star but at different inclinations to the plain of the sky. A recent interpretation of the line of sight velocity gradient across (perpendicular to its axis) the northeast jet of Fir 6b as a jet rotation leads to jet-launching radii of 2-3AU. However, the velocities of the jets 100-400km/s are much larger than the escape speed from these radii. Instead, I argue that the northeast jet of FIR 6b is compatible with a twin-jet structure as observed in some planetary nebulae. Fir 6b and these planetary nebulae share also unequal structure and intensity of the two opposite bipolar jets. The unequal bipolar sides can result from a sub-stellar binary companion on an eccentric orbit that is inclined to the accretion disk plain and perturbed the accretion disk in the YSO vicinity, 1-5Ro, during periastron passages. The twin-jet structure removes the extreme requirement that jets with velocities similar to the escape velocity from the YSO be launched from very large radii.

Note: the topic title displays "OMC-2 FIR 6b B" to emphasize the secondary object but this should actually be labelled as "OMC-2 FIR 6b b" to follow exoplanet naming rule.