Coutens, A., Willis, E. R., Garrod, R. T., Mueller, H. S. P., Bourke, T. L., Calcutt, H., Drozdovskaya, M. N., Jorgensen, J. K., Ligterink, N. F. W., Persson, M. V., Stephan, G., van der Wiel, M. H. D., van Dishoeck, E. F. and Wampfler, S. F. (2018). First detection of cyanamide (NH2CN) towards solar-type protostars. Astron. Astrophys., 612. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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Abstract

Searches for the prebiotically relevant cyanamide (NH2CN) towards solar-type protostars have not been reported in the literature. We present here the first detection of this species in the warm gas surrounding two solar-type protostars, using data from the Atacama Large Millimeter/Submillimeter Array Protostellar Interferometric Line Survey (PILS) of IRAS 16293-2422 B and observations from the LRAM Plateau de Bure Interferometer of NGC 1333 IRAS2A. We also detected the deuterated and C-13 isotopologs of NH2CN towards IRAS 16293-2422 B. This is the first detection of NHDCN in the interstellar medium. Based on a local thermodynamic equilibrium analysis, we find that the deuteration of cyanamide (similar to 1.7%) is similar to that of formamide (NH2CHO), which may suggest that these two molecules share NH2 as a common precursor. The NH2CN/NH2CHO abundance ratio is about 0.2 for IRAS 16293-2422 B and 0.02 for IRAS2A, which is comparable to the range of values found for Sgr B2. We explored the possible formation of NH2CN on grains through the NH2 + CN reaction using the chemical model MAGICKAL. Grain-surface chemistry appears capable of reproducing the gas-phase abundance of NH2CN with the correct choice of physical parameters.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Coutens, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Willis, E. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Garrod, R. T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mueller, H. S. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bourke, T. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Calcutt, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Drozdovskaya, M. N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Jorgensen, J. K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ligterink, N. F. W.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Persson, M. V.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stephan, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van der Wiel, M. H. D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
van Dishoeck, E. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wampfler, S. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-186628
DOI: 10.1051/0004-6361/201732346
Journal or Publication Title: Astron. Astrophys.
Volume: 612
Date: 2018
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
IRAS 16293-2422; MOLECULAR-SPECTROSCOPY; COLOGNE DATABASE; CARBODIIMIDE; MILLIMETER; SUBMILLIMETER; ROTATION; SPECTRUM; CH3NCO; DUSTMultiple languages
Astronomy & AstrophysicsMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/18662

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