First detection of cyanamide (NH2CN) towards solar-type protostars
Artikel i vetenskaplig tidskrift, 2018

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 IRAM Plateau de Bure Interferometer of NGC1333 IRAS2A. We also detected the deuterated and 13C 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 (∼ 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 ofNH2CN on grains through the NH2 +CN reaction using the chemical model MAGICKAL. Grain-surface chemistry appears capable of

Stars: protostars

ISM: individual objects: IRAS 16293-2422

Astrobiology

Astrochemistry

ISM: molecules

ISM: individual objects: NGC 1333 IRAS2A

Författare

A. Coutens

Hannah Calcutt

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

E. R. Willis

R. T. Garrod

Astronomy and Astrophysics

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

Ämneskategorier

Subatomär fysik

Astronomi, astrofysik och kosmologi

Annan fysik

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2019-10-30