Chemical differentiation within a binary Class II disk system

We do not know if the chemical composition of protoplanetary disks is set by nature or by nurture. Studying the chemistry of binary systems offers the unique opportunity to investigate this, as one could assume that two disks born from the same cloud share their chemical composition. This has however never been studied in detail. I am going to present data on MHO 1+2, a binary Class II disk in Taurus that has been targeted by observations with the SMA and ALMA. MHO 1+2 is part of an on-going Large Program at the SMA called SMA-SPEC (PI: K. Öberg) that covers >120 GHz in bandwidth for 40 bright, close-by protoplanetary disks. Utilizing this Large Program, I will present the first unbiased chemical survey of a binary system complemented by select high-resolution snapshots. The SMA data reveals that there is a clear chemical differentiation between the two components of the binary, which provides the first proof that the chemistry in binaries is not shared between sources and driven by nurture over nature. The ALMA data (PI: F. Long) reveals the presence of a stream of material that accretes from the natal cloud onto the disks, which is possibly the culprit of the chemical differentiation. In my talk I will highlight findings from the ALMA and SMA data, and demonstrate that in order to truly understand the chemistry in protoplanetary disks, and therefore the volatile component of planet-forming material, we need to get an unbiased view of their chemical composition.