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Chemistry along the star- and planet-formation sequence regulates howprebiotic building blocks -- carriers of the elements CHNOPS -- areincorporated into nascent planetesimals and planets. Spectral line observationsacross the electromagnetic spectrum are needed to fully characterizeinterstellar CHNOPS chemistry, yet to date there are only limited astrochemicalconstraints at THz frequencies. Here, we highlight advances to the study ofCHNOPS astrochemistry that will be possible with the Orbiting AstronomicalSatellite for Investigating Stellar Systems (OASIS). OASIS is a NASA missionconcept for a space-based observatory that will utilize an inflatable 14-mreflector along with a heterodyne receiver system to observe at THz frequencieswith unprecedented sensitivity and angular resolution. As part of a survey ofH2O and HD towards ~100 protostellar and protoplanetary disk systems, OASISwill also obtain statistical constraints on the inventories of light hydridesincluding NH3 and H2S towards protoplanetary disks, as well as complex organicsin protostellar hot corinos and envelopes. Line surveys of additionalstar-forming regions, including high-mass hot cores, protostellar outflowshocks, and prestellar cores, will also leverage the unique capabilities ofOASIS to probe high-excitation organics and small hydrides, as is needed tofully understand the chemistry of these objects.

Astrochemistry with the Orbiting Astronomical Satellite for Investigating Stellar Systems (OASIS)