First detection of NHD and ND2 in the interstellar medium

  title={First detection of NHD and ND2 in the interstellar medium},
  author={Mattia Melosso and Luca Bizzocchi and Olli Sipil{\"a} and Barbara Michela Giuliano and Luca Dore and Filippo Tamassia and Marie-Aline Martin-Drumel and Olivier Pirali and Elena Redaelli and Paola Caselli},
  journal={Astronomy \& Astrophysics},
Context. Deuterium fractionation processes in the interstellar medium (ISM) have been shown to be highly efficient in the family of nitrogen hydrides. To date, observations have been limited to ammonia (NH2D, NHD2, ND3) and imidogen radical (ND) isotopologues. Aims. We want to explore the high-frequency windows offered by the Herschel Space Observatory to search for deuterated forms of the amidogen radical NH2 and to compare the observations against the predictions of our comprehensive gas… 

Figures and Tables from this paper

Deuterium fractionation of nitrogen hydrides: detections of NHD and ND2

Although ammonia is an abundant molecule commonly observed towards the dense interstellar medium, it has not yet been established whether its main formation route is from gas-phase ion-molecule

The Formation of Monosubstituted Cyclopropenylidene Derivatives in the Interstellar Medium via Neutral–Neutral Reaction Pathways

Five substituted cyclopropenylidene derivatives (c-C3HX, X=CN, OH, F, NH2), all currently undetected in the interstellar medium (ISM), are found herein to have mechanistically viable, gas-phase

Ab Initio Study of Fine and Hyperfine Interactions in Triplet POH

A theoretical spectroscopic characterisation of the rotational spectrum of POH in its 3A″ ground electronic state is reported and it is pointed out that the predicted hyperfine structures represent a key pattern for the recognition of P OH in laboratory and interstellar spectra.

Hyperfine-Resolved Near-Infrared Spectra of H217O

The need of including small hyperfine effects in the analysis of H217O spectra has been demonstrated together with the ability of the computational strategy employed for providing quantitative predictions of the corresponding parameters.

First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)★.

The first detection in space of the two doubly deuterated isotopologues of methyl acetylene is reported, which points to gas-phase chemical reactions, rather than grain-surface processes, as responsible for the formation and deuterium fractionation of CH3CCH in L483.

Space and laboratory observation of the deuterated cyanomethyl radical HDCCN

Our observations of TMC-1 with the Yebes 40 m radio telescope in the 31.0–50.3 GHz range allowed us to detect a group of unidentified lines, showing a complex line pattern indicative of an open-shell

First sample of N2H+ nitrogen isotopic ratio measurements in low-mass protostars

Context. The nitrogen isotopic ratio is considered an important diagnostic tool of the star formation process, and N2H+ is particularly important because it is directly linked to molecular nitrogen



Atomic Deuterium/Hydrogen in the Galaxy

An accurate value of the D/H ratio in the local interstellar medium (LISM) and a better understanding of the D/H variations with position in the Galactic disk and halo are vitally important questions

The Herschel Data Processing System - HIPE and Pipelines - Up and Running Since the Start of the Mission

The scope, the management and development methodology of the Herschel Data Processing system is summarized, some key software elements are presented and an overview about the current status and future development milestones is given.

Submillimeter and Far-infrared Spectroscopy of Monodeuterated Amidogen Radical (NHD): Improved Rest Frequencies for Astrophysical Observations

Observations of ammonia in interstellar environments have revealed high levels of deuteration, and all its D-containing variants, including ND3, have been detected in cold prestellar cores and around

Modeling deuterium chemistry in starless cores: full scrambling versus proton hop

We constructed two new models for deuterium and spin-state chemistry for the purpose of modeling the low-temperature environment prevailing in starless and pre-stellar cores. The fundamental

Why does ammonia not freeze out in the centre of pre-stellar cores?

We carried out a parameter-space exploration of the ammonia abundance in the pre-stellar core L1544, where it has been observed to increase toward the center of the core with no signs of freeze-out

Protostellar and cometary detections of organohalogens

Organohalogens, a class of molecules that contain at least one halogen atom bonded to carbon, are abundant on the Earth where they are mainly produced through industrial and biological processes1.

Molecular Abundances and Low-Mass Star Formation. II. Organic and Deuterated Species toward IRAS 16293-2422

Millimeter and submillimeter line surveys of the protobinary source IRAS 16293-2422 are presented in the 230 and 345 GHz windows. In total, 265 lines belonging to 44 molecules and their isotopomers