SMA CO (2-1) OBSERVATIONS OF CG 30: A PROTOSTELLAR BINARY SYSTEM WITH A HIGH-VELOCITY QUADRUPOLAR MOLECULAR OUTFLOW

We present interferometric observations in the (12)CO (2-1) line and at 1.3 mm dust continuum of the low-mass protostellar binary system in the cometary globule CG 30, using the Submillimeter Array. The dust continuum images resolve two compact sources (CG 30N and CG 30S), with a linear separation of similar to 8700 AU and total gas masses of similar to 1.4 and similar to 0.6 M(circle dot), respectively. With the CO images, we discover two high-velocity bipolar M, molecular outflows, driven by the two sources. The two outflows are nearly perpendicular to each other, showing a quadrupolar morphology. The northern bipolar outflow extends along the southeast (redshifted, with a velocity up to similar to 23 km s(-1)) and northwest (blueshifted, velocity up to similar to 30 km s(-1)) directions, while the southern pair has an orientation from southwest (blueshifted, velocity up to similar to 13 km s(-1)) to northeast (redshifted, velocity up to similar to 41 km s(-1)). The outflow mass of the northern pair, driven by the higher mass source CG 30N, is similar to 9 times larger than that of the southern pair. The discovery of the quadrupolar molecular outflow in the CG 30 protobinary system, as well as the presence of other quadrupolar outflows associated with binary systems, demonstrate that the disks in (wide) binary systems are not necessarily co-aligned after fragmentation.