First detection of cyanamide (NH2CN) towards solar-type protostars
Journal article, 2018

Searches for the prebiotically relevant cyanamide (NH 2 CN) 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 IRAM Plateau de Bure Interferometer of NGC 1333 IRAS2A. We also detected the deuterated and 13 C isotopologs of NH 2 CN 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 (∼1.7%) is similar to that of formamide (NH 2 CHO), which may suggest that these two molecules share NH 2 as a common precursor. The NH 2 CN/NH 2 CHO 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 NH 2 CN on grains through the NH 2 + CN reaction using the chemical model MAGICKAL. Grain-surface chemistry appears capable of reproducing the gas-phase abundance of NH 2 CN with the correct choice of physical parameters.

ISM: molecules

ISM: individual objects: NGC 1333 IRAS2A

Astrobiology

Stars: protostars

ISM: individual objects: IRAS 16293-2422

Astrochemistry

Author

A. Coutens

Laboratoire d'Astrophysique de Bordeaux

E. R. Willis

University of Virginia

R. T. Garrod

University of Virginia

H. S.P. Müller

University of Cologne

T. L. Bourke

SKA Organisation

H. Calcutt

University of Copenhagen

M. N. Drozdovskaya

University of Bern

J. K. Jorgensen

University of Copenhagen

N. F W Ligterink

Leiden University

Magnus V. Persson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

G. Stéphan

University of Virginia

M. H. D. van der Wiel

Netherlands Institute for Radio Astronomy (ASTRON)

E. F. van Dishoeck

Max Planck Institute

Leiden University

S. F. Wampfler

University of Bern

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 612 A107

Magnetic fields and the outflows during the formation and evolution of stars (OUTFLOWMAGN)

European Commission (FP7), 2014-05-01 -- 2019-04-30.

Advanced Radio Astronomy in Europe (RADIONET3)

European Commission (FP7), 2012-01-01 -- 2015-12-31.

Subject Categories

Astronomy, Astrophysics and Cosmology

Geochemistry

Metallurgy and Metallic Materials

DOI

10.1051/0004-6361/201732346

More information

Latest update

9/6/2018 1