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Formamide (NH$_2$CHO) has previously been detected in several star-formingregions and is thought to be a precursor for different prebiotic molecules. Itsformation mechanism is still debated, however. Observations of formamide,related species and their isopotologues may provide useful clues to thechemical pathways leading to their formation. The Protostellar InterferometricLine Survey (PILS) represents an unbiased high angular resolution andsensitivity spectral survey of the low-mass protostellar binary IRAS 16293-2422with the Atacama Large Millimeter/submillimeter Array (ALMA). We detect for thefirst time the three singly deuterated forms of NH$_2$CHO (NH$_2$CDO, cis- andtrans-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 sameregion. Based on observations of the $^{13}$C isotopologues of formamide and astandard $^{12}$C/$^{13}$C ratio, the deuterium fractionation is found to besimilar for the three different forms with a value of about 2%. The DNCO/HNCOratio is also comparable to the D/H ratio of formamide ($\sim$1%). Theseresults are in agreement with the hypothesis that NH$_2$CHO and HNCO arechemically related through grain surface formation.

The ALMA-PILS survey: First detections of deuterated formamide and deuterated isocyanic acid in the interstellar medium