Abstract
We present a high-resolution millimeter study of the very young class 0 protostar IRAM 04191+1522 in the Taurus molecular cloud. N2H+(1-0) observations with the IRAM Plateau de Bure Interferometer and 30 m telescope demonstrate that the molecular ion N2H+ disappears from the gas phase in the inner part of the protostellar envelope ( AU, 2 cm-3). This result departs from the predictions of current chemical models. It suggests either that N2 is more depleted than the models predict, owing to a higher binding energy on polar ice or an enhanced grain chemistry transforming N2 to less volatile species, or that strong deuterium fractionation enhances N2D+ to the detriment of N2H+.
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