Volume 419, Number 3, June I 2004
|Page(s)||L35 - L38|
|Published online||07 May 2004|
Letter to the Editor
Disappearance of N2H^+ from the gas phase in the class 0 protostar IRAM 04191*
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
2 LERMA/LRA, École Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
3 Service d'Astrophysique, CEA/DSM/DAPNIA, C.E. Saclay, 91191 Gif-sur-Yvette Cedex, France e-mail: firstname.lastname@example.org
Corresponding author: A. Belloche, email@example.com
Accepted: 10 April 2004
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+.
Key words: stars: formation / circumstellar matter / stars: individual: IRAM 04191+1522 / ISM: abundances / astrochemistry / stars: rotation
© ESO, 2004
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