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- W2001057306 abstract "HH 211 is a nearby young protostellar system with a highly collimated jet. We have mapped it in 352 GHz continuum, SiO (J = 8 − 7), and HCO+ (J = 4 − 3) emission at up to ∼02 resolution with the Submillimeter Array (SMA). The continuum source is now resolved into two sources, SMM1 and SMM2, with a separation of ∼ 84 AU. SMM1 is seen at the center of the jet, probably tracing a (inner) dusty disk around the protostar driving the jet. SMM2 is seen to the southwest of SMM1 and may trace an envelope-disk around a small binary companion. A flattened envelope-disk is seen in HCO+ around SMM1 with a radius of ∼ 80 AU perpendicular to the jet axis. Its velocity structure is consistent with a rotation motion and can be fitted with a Keplerian law that yields a mass of ∼50 ± 15 MJup (a mass of a brown dwarf) for the protostar. Thus, the protostar could be the lowest mass source known to have a collimated jet and a rotating flattened envelope-disk. A small-scale (∼200 AU) low-speed (∼2 km s−1) outflow is seen in HCO+ around the jet axis extending from the envelope-disk. It seems to rotate in the same direction as the envelope-disk and may carry away part of the angular momentum from the envelope-disk. The jet is seen in SiO close to ∼100 AU from SMM1. It is seen with a C-shaped bending. It has a transverse width of ≲ 40 AU and a velocity of ∼ 170 ± 60 km s−1. A possible velocity gradient is seen consistently across its innermost pair of knots, ∼0.5 km s−1 at ∼10 AU, consistent with the sense of rotation of the envelope-disk. If this gradient is an upper limit of the true rotational gradient of the jet, then the jet carries away a very small amount of angular momentum of ≲ 5 AU km s−1 and thus must be launched from the very inner edge of the disk near the corotation radius." @default.
- W2001057306 created "2016-06-24" @default.
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- W2001057306 date "2009-06-24" @default.
- W2001057306 modified "2023-10-11" @default.
- W2001057306 title "ROTATION AND OUTFLOW MOTIONS IN THE VERY LOW-MASS CLASS 0 PROTOSTELLAR SYSTEM HH 211 AT SUBARCSECOND RESOLUTION" @default.
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- W2001057306 doi "https://doi.org/10.1088/0004-637x/699/2/1584" @default.
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