The microwave and far infrared spectra of acetaldehyde-

Elkeurti, M.; Coudert, L. H.; Medvedev, Ivan R.; Maeda, Atsuko; Lucia, Frank C. De; McKellar, A. R. W.; Moazzen‐Ahmadi, N.; Appadoo, D.R.T.; Toumi, Salah

doi:10.1016/j.jms.2010.07.005

Cited by 9 publications

(15 citation statements)

References 21 publications

(37 reference statements)

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“…The CDMS entry for CH 3 CDO is based on Coudert et al (2019). The fit and the experimental frequencies used are described in Elkeurti et al (2010), with additional A&A proofs: manuscript no. aa36299-19…”

Section: Appendix A: Statistical Distancementioning

confidence: 99%

The ALMA-PILS survey: inventory of complex organic molecules towards IRAS 16293–2422 A

Manigand

Jørgensen

Calcutt

et al. 2020

A&A

132

154

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Context. Complex organic molecules are detected in many sources in the warm inner regions of envelopes surrounding deeply embedded protostars. Exactly how these species form remains an open question.Aims. This study aims to constrain the formation of complex organic molecules through comparisons of their abundances towards the Class 0 protostellar binary IRAS 16293-2422. Methods. We utilised observations from the Atacama Large Millimetre/submillimetre Array (ALMA) Protostellar Interferometric Line Survey (PILS) of IRAS 16293-2422. The species identification and the rotational temperature and column density estimation were derived by fitting the extracted spectra towards IRAS 16293-2422 A and IRAS 16293-2422 B with synthetic spectra. The majority of the work in this paper pertains to the analysis of IRAS 16293-2422 A for a comparison with the results from the other binary component, which have already been published. Results. We detect 15 different complex species, as well as 16 isotopologues towards the most luminous companion protostar IRAS 16293-2422 A. Tentative detections of an additional 11 isotopologues are reported. We also searched for and report on the first detections of methoxymethanol (CH 3 OCH 2 OH) and trans-ethyl methyl ether (t-C 2 H 5 OCH 3 ) towards IRAS 16293-2422 B and the follow-up detection of deuterated isotopologues of acetaldehyde (CH 2 DCHO and CH 3 CDO). Twenty-four lines of doubly-deuterated methanol (CHD 2 OH) are also identified. Conclusions. The comparison between the two protostars of the binary system shows significant differences in abundance for some of the species, which are partially correlated to their spatial distribution. The spatial distribution is consistent with the sublimation temperature of the species; those with higher expected sublimation temperatures are located in the most compact region of the hot corino towards IRAS 16293-2422 A. This spatial differentiation is not resolved in IRAS 16293-2422 B and will require observations at a higher angular resolution. In parallel, the list of identified CHD 2 OH lines shows the need of accurate spectroscopic data including their line strength. Article number, page 2 of 31 S. Manigand et al.: Inventory of complex organic molecules towards IRAS 16293-2422 A Notes. (a) e 0 , o 1 and e 1 corresponds to the three first torsional states. The notation of the quantum numbers is directly taken from Mukhopadhyay (2016). (b) This corresponds to the number indicated in the top-right corner of each panel in Figures D.1 and D.2. (c) W is the integrated intensity of the unblended lines, summed over the range [ν 0 − ∆ν FWHM , ν 0 + ∆ν FWHM ], given ∆ν FWHM = ν 0 FWHM c , with FWHM equal to 2.2 and 0.8 km s −1 for IRAS 16293A and B, respectively.

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Section: Appendix A: Statistical Distancementioning

confidence: 99%

The ALMA-PILS survey: inventory of complex organic molecules towards IRAS 16293–2422 A

Manigand

Jørgensen

Calcutt

et al. 2020

A&A

132

154

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“…The 13 C isotopic species has also been studied up to 950 GHz [49]. The deuterated species CD 3 CHO [31] and CH 3-CDO [50] have also been recorded at mm/sub-millimeter wave frequencies.…”

Section: Acetaldehydementioning

confidence: 99%

A Ka-band chirped-pulse Fourier transform microwave spectrometer

Zaleski

Neill

Muckle

et al. 2012

Journal of Molecular Spectroscopy

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“…The microwave spectrum of the normal species was first analyzed by Kilb et al (1957) and has since then been investigated up to the ν t = 4 torsional state (Herschbach 1959;Iijima & Tsuchiya 1972;Bauder & Günthard 1976;Kleiner et al 1990Kleiner et al , 1992Kleiner et al , 1996Smirnov et al 2014), leading to its detection (Gilmore et al 1976) in the interstellar medium (ISM). The isotopic species with a symmetrical CH 3 or CD 3 methyl group were also investigated (Kleiner et al 1999;Coudert & López 2006;Elkeurti et al 2010;Zaleski et al 2017), but none are detected in the ISM. There is only a limited number of spectroscopic results for isotopic species with a partially deuterated CH 2 D or CD 2 H asymmetrical methyl group.…”

Section: Introductionmentioning

confidence: 99%

“…We first spectroscopically characterized the species that has a partially deuterated CH 2 D methyl group, prior to designing its database. For the species with a symmetrical CH 3 methyl group, the database is based on the previous spectroscopic investigation by Elkeurti et al (2010). We present in Sect.…”

Section: Introductionmentioning

confidence: 99%

Astrophysical detections and databases for the mono deuterated species of acetaldehyde CH₂DCOH and CH₃COD

Coudert

Margulès

Vastel

et al. 2019

A&A

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Context. Detection of deuterated species may provide information on the evolving chemistry in the earliest phases of star-forming regions. For molecules with two isomeric forms of the same isotopic variant, gas-phase and solid-state formation pathways can be differentiated using their abundance ratio. Aims. Spectroscopic databases for astrophysical purposes are built for the two mono deuterated isomeric species CH2DCOH and CH3COD of the complex organic molecule acetaldehyde. These databases can be used to search and detect these two species in astrophysical surveys, retrieving their column density and therefore abundances. Methods. Submillimeter wave and terahertz transitions were measured for mono deuterated acetaldehyde CH2DCOH which is a non-rigid species displaying internal rotation of its asymmetrical CH2D methyl group. An analysis of a dataset consisting of previously measured microwave data and the newly measured transition was carried out with a model accounting for the large amplitude torsion. Results. The frequencies of 2556 transitions are reproduced with a unitless standard deviation of 2.3 yielding various spectroscopic constants. Spectroscopic databases for astrophysical purposes were built for CH2DCOH using the results of the present analysis and for CH3COD using the results of a previous spectroscopic investigation. These two species were both searched for and are detected toward a low-mass star-forming region. Conclusions. We report the first detection of CH2DCOH (93 transitions) and the detection of CH3COD (43 transitions) species in source B of the IRAS 16293−2422 young stellar binary system located in the ρ Ophiuchus cloud region, using the publicly available ALMA Protostellar Interferometric Line Survey.

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The microwave and far infrared spectra of acetaldehyde-

Cited by 9 publications

References 21 publications

The ALMA-PILS survey: inventory of complex organic molecules towards IRAS 16293–2422 A

The ALMA-PILS survey: inventory of complex organic molecules towards IRAS 16293–2422 A

A Ka-band chirped-pulse Fourier transform microwave spectrometer

Astrophysical detections and databases for the mono deuterated species of acetaldehyde CH₂DCOH and CH₃COD

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The microwave and far infrared spectra of acetaldehyde-

Cited by 9 publications

References 21 publications

The ALMA-PILS survey: inventory of complex organic molecules towards IRAS 16293–2422 A

The ALMA-PILS survey: inventory of complex organic molecules towards IRAS 16293–2422 A

A Ka-band chirped-pulse Fourier transform microwave spectrometer

Astrophysical detections and databases for the mono deuterated species of acetaldehyde CH2DCOH and CH3COD

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Astrophysical detections and databases for the mono deuterated species of acetaldehyde CH₂DCOH and CH₃COD