dc.contributor.author | Sanz Novo, Miguel | |
dc.contributor.author | Belloche, A. | |
dc.contributor.author | Rivilla, V. M. | |
dc.contributor.author | Garrod, R. T. | |
dc.contributor.author | Kolesniková, Lucie | |
dc.contributor.author | Valle, J. C. | |
dc.contributor.author | Rodríguez-Almeida, L. | |
dc.contributor.author | Jimenez-Serra, I. | |
dc.contributor.author | Martín-Pintado, J. | |
dc.contributor.author | Müller, H. S. P. | |
dc.contributor.author | Menten, K. M. | |
dc.contributor.author | Sanz Novo, Miguel | |
dc.contributor.author | Alonso Hernández, José Luis | |
dc.contributor.author | Redondo Cristóbal, María del Pilar | |
dc.contributor.author | Barrientos Benito, María Carmen | |
dc.contributor.author | menten | |
dc.date.accessioned | 2024-01-29T11:42:06Z | |
dc.date.available | 2024-01-29T11:42:06Z | |
dc.date.issued | 2022 | |
dc.identifier.citation | A&A 666, A114 (2022) | es |
dc.identifier.issn | 0004-6361 | es |
dc.identifier.uri | https://uvadoc.uva.es/handle/10324/65169 | |
dc.description | Producción Científica | es |
dc.description.abstract | Context. In recent times, large organic molecules of exceptional complexity have been found in diverse regions of the interstellar
medium.
Aims. In this context, we aim to provide accurate frequencies of the ground vibrational state of two key aliphatic aldehydes, n-butanal
and its branched-chain isomer, i-butanal, to enable their eventual detection in the interstellar medium. We also want to test the level of
complexity that interstellar chemistry can reach in regions of star formation.
Methods. We employ a frequency modulation millimeter-wave absorption spectrometer to measure the rotational features of n- and
i-butanal. We analyze the assigned rotational transitions of each rotamer separately using the A-reduced semirigid-rotor Hamiltonian.
We use the spectral line survey ReMoCA performed with the Atacama Large Millimeter/submillimeter Array to search for n- and ibutanal
toward the star-forming region Sgr B2(N). We also search for both aldehydes toward the molecular cloud G+0.693-0.027 with
IRAM 30m and Yebes 40m observations. The observational results are compared with computational results from a recent gas-grain
astrochemical model.
Results. Several thousand rotational transitions belonging to the lowest-energy conformers of two distinct linear and branched isomers
have been assigned in the laboratory spectra up to 325 GHz. A precise set of the relevant rotational spectroscopic constants has been
determined for each structure as a first step toward identifying both molecules in the interstellar medium.We report non-detections of nand
i-butanal toward both sources, Sgr B2(N1S) and G+0.693-0.027. We find that n- and i-butanal are at least 2–6 and 6–18 times less
abundant than acetaldehyde toward Sgr B2(N1S), respectively, and that n-butanal is at least 63 times less abundant than acetaldehyde
toward G+0.693-0.027. While propanal is not detected toward Sgr B2(N1S) either, with an abundance at least 5–11 lower than that
of acetaldehyde, propanal is found to be 7 times less abundant than acetaldehyde in G+0.693-0.027. Comparison with astrochemical
models indicates good agreement between observed and simulated abundances (where available). Grain-surface chemistry appears
sufficient to reproduce aldehyde ratios in G+0.693-0.027; gas-phase production may play a more active role in Sgr B2(N1S). Model
estimates for the larger aldehydes indicate that the observed upper limits may be close to the underlying values.
Conclusions. Our astronomical results indicate that the family of interstellar aldehydes in the Galactic center region is characterized
by a drop of one order of magnitude in abundance at each incrementation in the level of molecular complexity | es |
dc.format.mimetype | application/pdf | es |
dc.language.iso | spa | es |
dc.publisher | EDP Sciences | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject.classification | ISM: molecules | es |
dc.subject.classification | molecular data | es |
dc.subject.classification | astrochemistry | es |
dc.subject.classification | line: identification | es |
dc.subject.classification | ISM: individual objects: Sagittarius B2 | es |
dc.subject.classification | ISM: individual objects: G+0.693-0.027 | es |
dc.title | Toward the limits of complexity of interstellar chemistry: Rotational spectroscopy and astronomical search for n- and i-butanal | es |
dc.type | info:eu-repo/semantics/article | es |
dc.rights.holder | © ESO 2022 | es |
dc.identifier.doi | 10.1051/0004-6361/202142848 | es |
dc.relation.publisherversion | https://doi.org/10.1051/0004-6361/202142848 | es |
dc.identifier.publicationfirstpage | A114 | es |
dc.identifier.publicationtitle | Astronomy & Astrophysics | es |
dc.identifier.publicationvolume | 666 | es |
dc.peerreviewed | SI | es |
dc.identifier.essn | 1432-0746 | es |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.type.hasVersion | info:eu-repo/semantics/acceptedVersion | es |