Decoding Galactic Deuterium: Insights from Protostellar Outflows Using JWST

Francis et al. used JWST to measure deuterium-to-hydrogen ratios in protostellar outflows, revealing significant spatial variations and lower-than-expected values. The study suggests deuterium depletion onto dust grains and its release in shocks may explain these discrepancies. By linking HD emissions with shock tracers like sulfur, the research highlights the role of deuterium in understanding Galactic chemical evolution and showcases JWST’s capabilities for isotope studies.