J/A+A/666/A158 2-hydroxyprop-2-enal millimetre-wave spectroscopy (Koucky+, 2022)
Millimetre-wave spectroscopy of 2-hydroxyprop-2-enal and an astronomical
search with ALMA.
Koucky J., Kolesnikova L., Lukova K., Vavra K., Kania P., Coutens A.,
Loison J.-C., Jorgensen J.K., Belloche A., Urban S.
<Astron. Astrophys. 666, A158 (2022)>
=2022A&A...666A.158K 2022A&A...666A.158K (SIMBAD/NED BibCode)
ADC_Keywords: Interstellar medium ; Spectroscopy ; Atomic physics
Keywords: astrochemistry - ISM: molecules - line: identification -
ISM: individual objects: IRAS 16293-2422 -
ISM: individual objects: Sagittarius B2 -
astronomical databases: miscellaneous
Abstract:
Several sugar-like molecules have been found in the interstellar
medium. 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 typical for some
interstellar molecules. Furthermore, it has been recently predicted to
be more abundant in the interstellar medium than its tentatively
detected isomer 3-hydroxypropenal.
So far, only low-frequency microwave data of 2-hydroxyprop-2-enal have
been published. The aim of this work is to deepen knowledge about the
millimetre-wave spectrum of 2-hydroxyprop-2-enal in the region
enabling its detailed search towards astronomical objects. In
particular, we target the solar-type protostar IRAS 16293-2422 and
star-forming region Sagittarius (Sgr) B2(N).
The rotational spectrum of 2-hydroxyprop-2-enal was measured and
analysed in the frequency regions of 128-166GHz and 285-329GHz. The
interstellar exploration towards IRAS 16293-2422 was based on the
Atacama Large Millimeter/submillimeter Array (ALMA) data of the
Protostellar Interferometric Line Survey. We also used the imaging
spectral line survey ReMoCA performed with ALMA toward Sgr B2(N) to
search for 2-hydroxyprop-2-enal in the interstellar medium. We
modelled the astronomical spectra under the assumption of local
thermodynamic equilibrium.
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 nondetection towards
IRAS16293 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 also report the nondetection of
2-hydroxyprop-2-enal toward the hot molecular core Sgr B2(N1). We did
not detect the related aldehydes 2-hydroxypropanal and
3-hydroxypropenal either. We find that these three molecules are at
least 9, 4, and 10 times less abundant than acetaldehyde in this
source, respectively.
Despite the nondetections of 2-hydroxyprop-2-enal, the results of this
work represent a significant improvement on previous investigations in
the microwave region and meets the requirements for further searches
of this molecule in the interstellar medium.
Description:
Observed rotational transitions of 2-hydroxyprop-2-enal in the ground
state and the lowest-energy vibrational state.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 66 1455 List of the measured transitions of
2-hydroxyprop-2-enal
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- State Vibrational state
7- 8 I2 --- J' Upper state J quantum number
10- 11 I2 --- Ka' Upper state Ka quantum number
13- 14 I2 --- Kc' Upper state Kc quantum number
16- 17 I2 --- J" Lower state J quantum number
19- 20 I2 --- Ka" Lower state Ka quantum number
22- 23 I2 --- Kc" Lower state Kc quantum number
25- 35 F11.4 MHz FreqObs Observed transition frequency
37- 43 F7.4 MHz O-C Observed minus calculated frequency
45- 49 F5.3 MHz Unc Experimental uncertainty
51- 57 F7.4 MHz (O-C)b ?=- Observed minus calculated frequency
for blends
59- 62 F4.2 --- Wgb ?=- Weight of the components of the blends
64- 66 A3 --- Notes Source of the data (1)
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Note (1): Source of data as follows:
(1) = Lovas et al. (2003, J. Mol. Spectrosc., 222, 263)
(2) = This work
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Acknowledgements:
Jan Koucky, jan.koucky(at)vscht.cz
(End) Patricia Vannier [CDS] 09-Sep-2022