An unbiased NOEMA 2.6 to 4mm survey of the GG Tau ring: First detection of CCS in a protoplanetary disk

We used NOEMA with the new correlator PolyFix to observe rotational lines at 2.6 to 4 mm from 38 molecules in the protoplanetary disk (PPD) of GG Tau A and detected 17 molecules in the disk.  We analyzed the data with a radiative transfer code to derive molecular densities and the abundance relative to 13CO, which we compare to those of the TMC1 cloud and LkCa 15 disk. The analysis confirms that sulfur chemistry is not yet properly understood. The detection of the rare species CCS confirms that GG Tau A is a good laboratory to study the protoplanetary disk chemistry, thanks to its large disk size and mass.