optimize the continuum sensitivity, but also covered the $^{12}$CO J=2-1 transition at 230.538 GHz with 3840 channels over a bandwidth of 1.875 GHz. The set-up was slightly different between the two projects. The four basebands were centered at 215, 217, 230 and 232.5 GHz for data set A, but at 231.87, 232.55, 245, 247 GHz for data set B. The raw data were processed by the ALMA Regional Centers using the CASA package (ver.4.2.2 for data set A and ver. 4.3.1 for data set B). Nearby quasars and solar system objects (Callisto and Ganymede) were used for flux calibration, resulting in an absolute flux uncertainty $\lesssim$10 % (the Technical Handbook for cycle 2). The total on-source integration time is 4.58 hours for data set A, and 4.54 hours for data set B. No CO detection was reported in the pipeline reduced product. Details regarding the CO gas in the system will be reported in another publication (Booth et al. in prep.).

Results and Analysis
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Continuum Emission
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We generated the calibrated measurement sets using the scripts provided by the ALMA project for each of the data sets. We then split the observations into different fields (pointing) and spectral windows 