JWST MIRI observations of HD and H2 in protostellar outflows yield gas-phase D/H values that vary by a factor of about 4 among nearby sources and are generally a factor of 2 to 4 below Galactic chemical evolution model predictions.
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JOYS: The [D/H] abundance derived from protostellar outflows across the Galactic disk measured with JWST
JWST MIRI observations of HD and H2 in protostellar outflows yield gas-phase D/H values that vary by a factor of about 4 among nearby sources and are generally a factor of 2 to 4 below Galactic chemical evolution model predictions.