ATCA and Spitzer Observations of the Binary Protostellar Systems CG 30 and BHR 71

We present interferometric observations with resolution of ∼ 3′′ of the isolated, low-mass protostellar double cores CG 30 and BHR 71 in the N2H + (1− 0) line and at 3 mm dust continuum, using the Australian Telescope Compact Array (ATCA). The results are complemented by infrared data from the Spitzer Space Telescope. In CG 30, the 3 mm dust continuum images resolve two compact sources with a separation of ∼ 21. ′′7 (∼ 8700 AU). In BHR 71, strong dust continuum emission is detected at the position of the mid-infrared source IRS1, while only weak emission is detected from the secondary mid-infrared source IRS2. Assuming standard gas to dust ratio and optically thin 3 mm dust continuum emission, we derive hydrogen gas masses of 0.05− 2.1M for the four sub-cores. N2H + (1− 0) line emission is detected in both CG 30 and BHR 71, and is spatially associated with the thermal dust continuum emission. By simultaneously fitting ar X iv :0 80 5. 15 33 v1 [ as tr oph ] 1 1 M ay 2 00 8