First detection of cyanamide (NH2CN) towards solar-type protostars
Artikel i vetenskaplig tidskrift, 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

Författare

A. Coutens

Laboratoire d'Astrophysique de Bordeaux

E. R. Willis

University of Virginia

R. T. Garrod

University of Virginia

H. S.P. Müller

Universität zu Köln

T. L. Bourke

SKA Organisation

H. Calcutt

Köbenhavns Universitet

M. N. Drozdovskaya

Universität Bern

J. K. Jorgensen

Köbenhavns Universitet

N. F W Ligterink

Universiteit Leiden

Magnus V. Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

G. Stéphan

University of Virginia

M. H. D. van der Wiel

Netherlands Institute for Radio Astronomy (ASTRON)

E. F. van Dishoeck

Max Planck-institutet

Universiteit Leiden

S. F. Wampfler

Universität 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)

Europeiska kommissionen (FP7), 2014-05-01 -- 2019-04-30.

Advanced Radio Astronomy in Europe (RADIONET3)

Europeiska kommissionen (FP7), 2012-01-01 -- 2015-12-31.

Ämneskategorier

Astronomi, astrofysik och kosmologi

Geokemi

Metallurgi och metalliska material

DOI

10.1051/0004-6361/201732346

Mer information

Senast uppdaterat

2018-09-06