Query : 2021A&A...645A..75C

2021A&A...645A..75C - Astronomy and Astrophysics, volume 645A, 75-75 (2021/1-1)

Comprehensive rotational study and astronomical search for cyclopropanecarboxaldehyde.


Abstract (from CDS):

Context. At least a dozen molecules with a formyl group (HCO) have been observed to date in the interstellar medium (ISM), suggesting that other such species exist and remain to be discovered. However, there is still a lack of high-resolution spectroscopic data for simple molecular species of this type that could provide a basis for their detection.
Aims. Cyclopropanecarboxaldehyde, c-C3H5CHO, is a small molecule containing a formyl group and is therefore an interesting candidate for astrophysical detection. The rotational spectrum of cyclopropanecarboxaldehyde has been observed before, but its experimental rotational parameters are not precise enough to allow its detection in the millimetre-wave domain.
Methods. We measured the rotational spectrum of cyclopropanecarboxaldehyde in the frequency ranges 31.5-50 GHz and 72-116.5 GHz using the GACELA (GAS CEll for Laboratory Astrophysics) broadband high-resolution rotational spectrometer constructed at the Yebes Observatory. The spectroscopic study was supported by high-level theoretical calculations which were used in the identification of the vibrational excited states of cyclopropanecarboxaldehyde.
Results. Our analysis of the rotational spectrum of cyclopropanecarboxaldehyde allowed us to obtain accurate rotational parameters for the ground state of both cis and trans isomers, which were used to derive sufficiently reliable predictions up to 300 GHz. In addition to the ground states, we identified 12 and 6 vibrationally excited states for the trans and cis isomers, respectively, including fundamental modes, multiple excitation quanta, and combination states. We find that the gas phase concentration of the trans isomer is almost 1.2 times larger than that of the cis one. These new experimental rotational parameters were employed to search for cyclopropanecarboxaldehyde in the warm molecular clouds Orion KL and Sgr B2(N) using the spectral surveys captured by ALMA (Orion) and IRAM 30m (Sgr) at 1 and 3mm, respectively.

Abstract Copyright: © ESO 2021

Journal keyword(s): ISM: molecules - methods: laboratory: molecular - molecular data - line: identification

VizieR on-line data: <Available at CDS (J/A+A/645/A75): tablea1.dat-tablea22.dat>

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NAME Orion-KL SFR 05 35 14.16 -05 22 21.5           ~ 2153 1
2 [WLQ2014] MM4 cor 05 35 14.35 -05 22 30.9           ~ 9 0
3 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 598 1
4 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2092 1

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