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• W3105429241 endingPage "A121" @default.
• W3105429241 startingPage "A121" @default.
• W3105429241 abstract "C-cyanomethanimine (HNCHCN), existing in the two Z and E isomeric forms, is a key prebiotic molecule, but, so far, only the E isomer has been detected toward the massive star-forming region. Sagittarius B2(N) using transitions in the radio wavelength domain.With the aim of detecting HNCHCN in Sun-like-star forming regions, the laboratory investigation of its rotational spectrum has been extended to the millimeter-/submillimeter-wave (mm-/submm-) spectral window in which several unbiased spectral surveys have been already carried out.High-resolution laboratory measurements of the rotational spectrum of C-cyanomethanimine were carried out in the 100-420 GHz range using a frequency-modulation absorption spectrometer. We then searched for the C-cyanomethanimine spectral features in the mm-wave range using the high-sensitivity and unbiased spectral surveys obtained with the IRAM 30-m antenna in the ASAI context, the earliest stages of star formation from starless to evolved Class I objects being sampled.For both the Z and E isomers, the spectroscopic work has led to an improved and extended knowledge of the spectroscopic parameters, thus providing accurate predictions of the rotational signatures up to ~700 GHz. So far, no C-cyanomethanimine emission has been detected toward the ASAI targets, and upper limits of the column density of ~ 1011-1012 cm-2 could only be derived. Consequently, the C-cyanomethanimine abundances have to be less than a few 10-10 for starless and hot-corinos. A less stringent constraint, ≤ 10-9, is obtained for shocks sites.The combination of the upper limits of the abundances of C-cyanomethanimine together with accurate laboratory frequencies up to ~ 700 GHz poses the basis for future higher sensitivity searches around Sun-like-star forming regions. For compact (typically less than 1″) and chemically enriched sources such as hot-corinos, the use of interferometers as NOEMA and ALMA in their extended configurations are clearly needed." @default.
• W3105429241 created "2020-11-23" @default.
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• W3105429241 date "2018-01-01" @default.
• W3105429241 modified "2023-10-16" @default.
• W3105429241 title "Laboratory measurements and astronomical search for cyanomethanimine" @default.
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• W3105429241 doi "https://doi.org/10.1051/0004-6361/201731972" @default.
• W3105429241 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6071866" @default.
• W3105429241 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30078846" @default.
• W3105429241 hasPublicationYear "2018" @default.
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