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Fig. 6


Simulated ALMA cycle 2 observation (using CASA) of the predicted C i 609 μm emission from the β Pic disk, integrated over the spectral axis. With a primary beam of 12.6, a mosaic of three pointings with a spacing of 6 (Nyquist sampling) was sufficient to cover the disk. Contours denote 3, 6, 9, 12, and 15 times the rms noise level. The simulated observation time (on source) is 1.24 h. We simulated the most compact cycle 2 configuration (thirty-two 12 m-antennas, longest baseline ~160 m) and a precipitable water vapor column of 0.472 mm (first octile). The synthesized beam (0.76, corresponding to 15 AU at the distance of β Pic) is illustrated in the lower left corner.

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