The ALMA-PILS survey: First detections of deuterated formamide and deuterated isocyanic acid in the interstellar medium
Artikel i vetenskaplig tidskrift, 2016

Formamide (NH2CHO) has previously been detected in several star-forming regions and is thought to be a precursor for different prebiotic molecules. Its formation mechanism is still debated, however. Observations of formamide, related species, and their isopotologues may provide useful clues to the chemical pathways leading to their formation. The Protostellar Interferometric Line Survey (PILS) represents an unbiased, high angular resolution and sensitivity spectral survey of the low-mass protostellar binary IRAS 16293-2422 with the Atacama Large Millimeter/submillimeter Array (ALMA). For the first time, we detect the three singly deuterated forms of NH2CHO (NH2CDO, cis-and trans-NHDCHO), as well as DNCO towards the component B of this binary source. The images reveal that the different isotopologues are all present in the same region. Based on observations of the 13C isotopologues of formamide and a standard 12C/13C ratio, the deuterium fractionation is found to be similar for the three different forms with a value of about 2%. The DNCO/HNCO ratio is also comparable to the D/H ratio of formamide (~1%). These results are in agreement with the hypothesis that NH2CHO and HNCO are chemically related through grain-surface formation.

Stars: formation

Stars: protostars

Astrobiology

ISM: molecules

Astrochemistry

ISM: individual objects: IRAS 16293-2422

Författare

A. Coutens

University College London (UCL)

J. K. Jorgensen

Köbenhavns Universitet

M. H. D. van der Wiel

Köbenhavns Universitet

H. S. P. Müller

Universität zu Köln

J. M. Lykke

Köbenhavns Universitet

Per Bjerkeli

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

T. L. Bourke

SKA Organisation

H. Calcutt

Köbenhavns Universitet

M. N. Drozdovskaya

Universiteit Leiden

C. Favre

Centre national de la recherche scientifique (CNRS)

E. C. Fayolle

Harvard-Smithsonian Center for Astrophysics

R. T. Garrod

University of Virginia

S. K. Jacobsen

Köbenhavns Universitet

N. F W Ligterink

Universiteit Leiden

K. I. Öberg

Harvard-Smithsonian Center for Astrophysics

M. V. Persson

Universiteit Leiden

E. F. van Dishoeck

Universiteit Leiden

Max Planck-institutet

S. F. Wampfler

Köbenhavns Universitet

Astronomy and Astrophysics

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

Vol. 590 Art. no. L6-

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1051/0004-6361/201628612

Mer information

Senast uppdaterat

2018-09-07