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Based on the occurrence rates implied by the discoveries of 1I/`Oumuamua and2I/Borisov, the forthcoming Rubin Observatory Legacy Survey of Space and Time(LSST) should detect $\ge1$ interstellar objects every year (Hoover et al.2021). We advocate for future measurements of the production rates of H$_2$O,CO$_2$ and CO in these objects to estimate their carbon to oxygen ratios, whichtraces formation locations within their original protoplanetary disks. Wereview similar measurements for Solar System comets, which indicate formationinterior to the CO snowline. By quantifying the relative processing in theinterstellar medium and Solar System, we estimate that production rates willnot be representative of primordial compositions for the majority ofinterstellar comets. Preferential desorption of CO and CO$_2$ relative toH$_2$O in the interstellar medium implies that measured C/O ratios representlower limits on the primordial ratios. Specifically, production rate ratios of${\rm Q}({\rm CO})/{\rm Q}({\rm H_2O})<.2$ and ${\rm Q}({\rm CO})/{\rm Q}({\rmH_2O})>1$ likely indicate formation interior and exterior to the CO snowline,respectively. The high C/O ratio of 2I/Borisov implies that it formed exteriorto the CO snowline. We provide an overview of the currently operationalfacilities capable of obtaining these measurements that will constrain thefraction of ejected comets that formed exterior to the CO snowline. Thisfraction will provide key insights into the efficiency of and mechanisms forcometary ejection in exoplanetary systems.

The Volatile Carbon to Oxygen Ratio as a Tracer for the Formation Locations of Interstellar Comets