The submillimeter spectrum of deuterated glycolaldehydes

Bouchez, Agnès; Margulès, L.; Motiyenko, R. A.; Guillemin, Jean‐Claude; Walters, A.; Bottinelli, S.; Ceccarelli, C.; Kahane, C.

doi:10.1051/0004-6361/201118701

Cited by 14 publications

(11 citation statements)

References 25 publications

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“…Similar to the approach above we generate synthetic spectra and match those with the lines predicted to be the brightest in the spectra. The spectroscopy for the isotopologues is available through the CDMS database: for the two 13 C-isotopologues of glycolaldehyde, 13 CH 2 OHCHO and CH 2 OH 13 CHO, the data are based on measurements by Haykal et al (2013), while those for the three deuterated isotopologues, CHDOHCHO, CH 2 ODCHO and CH 2 OHCDO, are based on Bouchez et al (2012). The partition function for the isotopologues listed by the CDMS do not include the corrections for the vibrational contributions.…”

Section: Isotopologues Of Glycolaldehydementioning

confidence: 99%

The ALMA Protostellar Interferometric Line Survey (PILS)

Jørgensen

Wiel

Coutens

et al. 2016

A&A

371

582

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Context. The inner regions of the envelopes surrounding young protostars are characterised by a complex chemistry, with prebiotic molecules present on the scales where protoplanetary disks eventually may form. The Atacama Large Millimeter/submillimeter Array (ALMA) provides an unprecedented view of these regions zooming in on Solar System scales of nearby protostars and mapping the emission from rare species. Aims. The goal is to introduce a systematic survey, "Protostellar Interferometric Line Survey (PILS)", of the chemical complexity of one of the nearby astrochemical templates, the Class 0 protostellar binary IRAS 16293−2422, using ALMA, to understand the origin of the complex molecules formed in its vicinity. In addition to presenting the overall survey, the analysis in this paper focuses on new results for the prebiotic molecule glycolaldehyde, its isomers and rarer isotopologues and other related molecules.Methods. An unbiased spectral survey of IRAS 16293−2422 covering the full frequency range from 329 to 363 GHz (0.8 mm) has been obtained with ALMA, in addition to a few targeted observations at 3.0 and 1.3 mm. The data consist of full maps of the protostellar binary system with an angular resolution of 0.5 (60 AU diameter), a spectral resolution of 0.2 km s −1 and a sensitivity of 4-5 mJy beam −1 km s −1 -approximately two orders of magnitude better than any previous studies. Results. More than 10,000 features are detected toward one component in the protostellar binary, corresponding to an average line density of approximately one line per 3 km s −1 . Glycolaldehyde, its isomers, methyl formate and acetic acid, and its reduced alcohol, ethylene glycol, are clearly detected and their emission well-modeled with an excitation temperature of 300 K. For ethylene glycol both lowest state conformers, aGg and gGg , are detected, the latter for the first time in the ISM. The abundance of glycolaldehyde is comparable to or slightly larger than that of ethylene glycol. In comparison to the Galactic Center these two species are over-abundant relative to methanol, possibly an indication of formation of the species at low temperatures in CO-rich ices during the infall of the material toward the central protostar. Both 13 C and deuterated isotopologues of glycolaldehyde are detected, also for the first time ever in the ISM. For the deuterated species a D/H ratio of ≈5% is found with no differences between the deuteration in the different functional groups of glycolaldehyde, in contrast to previous estimates for methanol and recent suggestions of significant equilibration between water and -OH functional groups at high temperatures. Measurements of the 13 C-species lead to a 12 C: 13 C ratio of ≈30, lower than the typical ISM value. This low ratio may reflect an enhancement of 13 CO in the ice due to either ion-molecule reactions in the gas before freeze-out or differences in the temperatures where 12 CO and 13 CO ices sublimate. Conclusions. The results reinforce the importance of low temperature grain surfac...

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Section: Isotopologues Of Glycolaldehydementioning

confidence: 99%

The ALMA Protostellar Interferometric Line Survey (PILS)

Jørgensen

Wiel

Coutens

et al. 2016

A&A

371

582

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“…Moreover, as we show below, the previous assignment of one of the 13 C species is most probably erroneous and could not be used for astrophysical observations. The deuterated isotopologs of glycolaldehyde have recently been studied in the millimeter-wave region (150−630 GHz) by Bouchez et al (2012). This spectroscopic study was motivated by a future comparison of the D/H ratios for better understanding the formation of glycolaldehyde in hot cores and hot corinos.…”

Section: Introductionmentioning

confidence: 99%

Millimeter and submillimeter wave spectra of¹³C-glycolaldehydes

Haykal

Motiyenko

Margulès

et al. 2013

A&A

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Context. Glycolaldehyde (CH 2 OHCHO) is the simplest sugar and an important intermediate in the path toward forming more complex biologically relevant molecules. Astronomical surveys of interstellar molecules, such as those available with the very sensitive ALMA telescope, require preliminary laboratory investigations of the microwave and submillimeter-wave spectra of molecular species including new isotopologs -to identify these in the interstellar media. Aims. To achieve the detection of the 13 C isotopologs of glycolaldehyde in the interstellar medium, their rotational spectra in the millimeter and submillimeter-wave regions were studied. Methods. The spectra of 13 CH 2 OHCHO and CH 2 OH 13 CHO were recorded in the 150−945 GHz spectral range in the laboratory using a solid-state submillimeter-wave spectrometer in Lille. The observed line frequencies were measured with an accuracy of 30 kHz up to 700 GHz and of 50 kHz above 700 GHz. We analyzed the spectra with a standard Watson Hamiltonian. Results. About 10 000 new lines were identified for each isotopolog. The spectroscopic parameters were determined for the groundand the three lowest vibrational states up to 945 and 630 GHz. Previous microwave assignments of 13 CH 2 OHCHO were not confirmed. Conclusions. The provided line-lists and sets of molecular parameters meet the needs for a first astrophysical search of 13 C-glycolaldehydes.

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“…This paper is a continuation of a series of studies conducted in PhLAM Lille (France) that are devoted to the investigations of the spectra of different isotopic species of astrophysical molecules (Demyk et al 2007;Margulès et al 2009aMargulès et al ,b, 2010Carvajal et al 2009;Tercero et al 2012;Bouchez et al 2012;Coudert et al 2012Coudert et al , 2013Richard et al 2012Richard et al , 2013Haykal et al 2013;Kutsenko et al 2013;Nguyen et al 2013). In particular, these works led to the first interstellar detection of HCOOCH 2 D (Coudert et al 2013), HCOO 13 CH 3 (Carvajal et al 2009), HCO 18 OCH 3 , HC 18 OOCH 3 (Tercero et al 2012), and CH 2 DOCH 3 (Richard et al 2013).…”

Section: Introductionmentioning

confidence: 89%

Millimeter and submillimeter wave spectra of mono-¹³C-acetaldehydes

Margulès

Motiyenko

Ilyushin

et al. 2015

A&A

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Context. The acetaldehyde molecule is ubiquitous in the interstellar medium of our galaxy, and due to its dense and complex spectrum, large dipole moment, and several low-lying torsional states, acetaldehyde is considered to be a "weed" molecule for radio astronomy observations. Mono-13 C acetaldehydes 13 CH 3 CHO and CH 3 13 CHO are likely to be identified in astronomical surveys, such as those available with the very sensitive ALMA telescope. Laboratory measurements and analysis of the millimeter and submillimeter-wave spectra are the prerequisites for the successful radioastronomical search for the new interstellar molecular species, as well as for new isotopologs of already detected interstellar molecules. Aims. In this context, to provide reliable predictions of 13 CH 3 CHO and CH 3 13 CHO spectra in millimeter and submillimeter wave ranges, we study rotational spectra of these species in the frequency range from 50 to 945 GHz. Methods. The spectra of mono-13 C acetaldehydes were recorded using the spectrometer based on Schottky-diode frequencymultiplication chains in the Lille laboratory. The rotational spectra of 13 CH 3 CHO and CH 3 13 CHO molecules were analyzed using the Rho axis method. Results. In the recorded spectra we have assigned 6884 for the 13 CH 3 CHO species and 6458 for CH 3 13 CHO species new rotational transitions belonging to the ground, first, and second excited torsional states. These measurements were fitted together with previously published data to the Hamiltonian models that use 91 and 87 parameters to achieve overall weighted rms deviations 0.88 for the 13 CH 3 CHO species and 0.95 for CH 3 13 CHO. On the basis of the new spectroscopic results, predictions of transition frequencies in the frequency range up to 1 THz with J ≤ 60 and K a ≤ 20 are presented for both isotopologs.

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The submillimeter spectrum of deuterated glycolaldehydes

Cited by 14 publications

References 25 publications

The ALMA Protostellar Interferometric Line Survey (PILS)

The ALMA Protostellar Interferometric Line Survey (PILS)

Millimeter and submillimeter wave spectra of¹³C-glycolaldehydes

Millimeter and submillimeter wave spectra of mono-¹³C-acetaldehydes

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The submillimeter spectrum of deuterated glycolaldehydes

Cited by 14 publications

References 25 publications

The ALMA Protostellar Interferometric Line Survey (PILS)

The ALMA Protostellar Interferometric Line Survey (PILS)

Millimeter and submillimeter wave spectra of13C-glycolaldehydes

Millimeter and submillimeter wave spectra of mono-13C-acetaldehydes

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Millimeter and submillimeter wave spectra of¹³C-glycolaldehydes

Millimeter and submillimeter wave spectra of mono-¹³C-acetaldehydes