Query : 2022A&A...666A.158K

2022A&A...666A.158K - Astronomy and Astrophysics, volume 666A, 158 (2022/10-1)

Millimetre-wave spectroscopy of 2-hydroxyprop-2-enal and an astronomical search with ALMA.


Abstract (from CDS):

Context. Several sugar-like molecules have been found in the interstellar medium (ISM). The molecule studied in this work, 2-hydroxyprop-2-enal, is among the candidates to be searched for, as it is a dehydration product of C3 sugars and contains structural motifs that are typical for some interstellar molecules. Furthermore, it has recently been predicted that it is more abundant in the ISM than its tentatively detected isomer 3-hydroxypropenal.
Aims. So far, only low-frequency microwave data of 2-hydroxyprop-2-enal have been published. The aim of this work is to deepen our knowledge about the millimetre-wave spectrum of 2-hydroxyprop-2-enal, enabling its detailed search towards astronomical objects. In particular, we target the solar-type protostar IRAS 16293-2422 and the star-forming region Sagittarius (Sgr) B2(N).
Methods. The rotational spectrum of 2-hydroxyprop-2-enal was measured and analysed in the frequency regions of 128-166 GHz and 285-329 GHz. The interstellar exploration towards IRAS 16293-2422 was based on the Atacama Large Millimeter/submillimeter Array (ALMA) data of the Protostellar Interferometric Line Survey (PILS). We also used the imaging spectral line survey ReMoCA performed with ALMA towards Sgr B2(N) to search for 2-hydroxyprop-2-enal in the ISM. We modelled the astronomical spectra under the assumption of local thermodynamic equilibrium (LTE).
Results. We provide laboratory analysis of hundreds of rotational transitions of 2-hydroxyprop-2-enal in the ground state and the lowest lying excited vibrational state. We report its non-detection towards IRAS 16293 B. The 2-hydroxyprop-2-enal/3-hydroxypropenal abundance ratio is estimated to be ≲0.9-1.3, in agreement with the predicted value of ∼1.4. We report the non-detection of 2-hydroxyprop-2-enal towards the hot molecular core Sgr B2(N1), and we did not detect the related aldehydes 2-hydroxypropanal and 3-hydroxypropenal either. We find that these three molecules are at least nine, four, and ten times less abundant than acetaldehyde in this source, respectively.
Conclusions. Despite the non-detections of 2-hydroxyprop-2-enal, the results of this work represent a significant improvement on previous investigations in the microwave region and meet the requirements for further searches for this molecule in the ISM.

Abstract Copyright: © J. Koucký et al. 2022

Journal keyword(s): astrochemistry - ISM: molecules - line: identification - ISM: individual objects: IRAS 16293-2422 - ISM: individual objects: Sagittarius B2 - astronomical databases: miscellaneous

VizieR on-line data: <Available at CDS (J/A+A/666/A158): table5.dat>

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1205 1
2 NAME IRAS 16293-2422B Y*O 16 32 22.63 -24 28 31.8           ~ 255 0
3 [QSR2011] Sgr B2(N)-SMA2 cor 17 47 19.885 -28 22 13.29           ~ 76 0
4 [BMG2016] Sgr B2(N1) cor 17 47 19.889 -28 22 18.22           ~ 46 0
5 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 636 1
6 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2168 1
7 NAME Large Molecule Heimat MoC 17 47 20.4943 -28 22 11.656           ~ 123 0

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