Gaseous methanol in cold environments
Methanol (CH 3 OH) is the simplest and most abundant interstellar complex organic molecule (iCOM) observed in warm and cold environments. It is thought to be formed on the surfaces of dust grains and released into the gas-phase by thermal desorption of the ices in the warm regions where the dust tem...
| Autores: | , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Autònoma de Barcelona |
| Repositorio: | Dipòsit Digital de Documents de la UAB |
| Idioma: | inglés |
| OAI Identifier: | oai:ddd.uab.cat:324283 |
| Acceso en línea: | https://ddd.uab.cat/record/324283 https://dx.doi.org/urn:doi:10.1093/mnras/staf476 |
| Access Level: | acceso abierto |
| Palabra clave: | Astrochemistry Molecular data Protoplanetary discs ISM: clouds ISM: molecules |
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Gaseous methanol in cold environmentsis thermal desorption from low binding energy sites the explanation?Bariosco, Vittorio|||0009-0000-7269-8418Tinacci, Lorenzo|||0000-0001-9909-9570Pantaleone, Stefano|||0000-0002-2457-1065Ceccarelli, Cecilia|||0000-0001-9664-6292Rimola, Albert|||0000-0002-9637-4554Ugliengo, Piero|||0000-0001-8886-9832AstrochemistryMolecular dataProtoplanetary discsISM: cloudsISM: moleculesMethanol (CH 3 OH) is the simplest and most abundant interstellar complex organic molecule (iCOM) observed in warm and cold environments. It is thought to be formed on the surfaces of dust grains and released into the gas-phase by thermal desorption of the ices in the warm regions where the dust temperature is high ( ≥100 K). Ho we ver, the presence of gaseous methanol in cold environments represented a challenge since its detection, e.g. in cold molecular clouds, prestellar cores, and protoplanetary discs. The reason is that thermal desorption was thought to be completely inefficient in these conditions. In this work, we show that this is not the case. Specifically, we present new calculations of the binding energy (BE) distribution on an iced grain composed of 200 water molecules. On this grain we obtained 223 unique sites with different BE. We found that the methanol BE distribution is well reproduced by a Gaussian function with a mean of 35.5 kJ mol -1 (4255 K) and a standard deviation of 13.0 kJ mol -1 (1558 K). To facilitate the incorporation of our calculations into astrochemical models, we provide a table with the fraction of sites as a function of the BE and the corresponding prefactors. Comparison with published experimental BE values suggests that they are dominated by the larger BE sites. Finally, and most importantly, our calculations show that 2 per cent of the BEs are around 10 kJ mol -1 (1240 K), implying that thermal desorption from these sites may explain the presence of gaseous methanol in cold environments. 22025-01-0120252025-01-01Articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://ddd.uab.cat/record/324283https://dx.doi.org/urn:doi:10.1093/mnras/staf476reponame:Dipòsit Digital de Documents de la UABinstname:Universitat Autònoma de BarcelonaInglésengEuropean Commission https://doi.org/10.13039/501100000780 741002European Commission https://doi.org/10.13039/501100000780 865657European Commission https://doi.org/10.13039/501100000780 811312Agencia Estatal de Investigación https://doi.org/10.13039/501100011033 PID2021-126427NB-I00Ministerio de Ciencia e Innovación https://doi.org/10.13039/501100004837 CNS2023-144902open accesshttp://purl.org/coar/access_right/c_abf2Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.https://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:ddd.uab.cat:3242832026-06-06T12:50:31Z |
| dc.title.none.fl_str_mv |
Gaseous methanol in cold environments is thermal desorption from low binding energy sites the explanation? |
| title |
Gaseous methanol in cold environments |
| spellingShingle |
Gaseous methanol in cold environments Bariosco, Vittorio|||0009-0000-7269-8418 Astrochemistry Molecular data Protoplanetary discs ISM: clouds ISM: molecules |
| title_short |
Gaseous methanol in cold environments |
| title_full |
Gaseous methanol in cold environments |
| title_fullStr |
Gaseous methanol in cold environments |
| title_full_unstemmed |
Gaseous methanol in cold environments |
| title_sort |
Gaseous methanol in cold environments |
| dc.creator.none.fl_str_mv |
Bariosco, Vittorio|||0009-0000-7269-8418 Tinacci, Lorenzo|||0000-0001-9909-9570 Pantaleone, Stefano|||0000-0002-2457-1065 Ceccarelli, Cecilia|||0000-0001-9664-6292 Rimola, Albert|||0000-0002-9637-4554 Ugliengo, Piero|||0000-0001-8886-9832 |
| author |
Bariosco, Vittorio|||0009-0000-7269-8418 |
| author_facet |
Bariosco, Vittorio|||0009-0000-7269-8418 Tinacci, Lorenzo|||0000-0001-9909-9570 Pantaleone, Stefano|||0000-0002-2457-1065 Ceccarelli, Cecilia|||0000-0001-9664-6292 Rimola, Albert|||0000-0002-9637-4554 Ugliengo, Piero|||0000-0001-8886-9832 |
| author_role |
author |
| author2 |
Tinacci, Lorenzo|||0000-0001-9909-9570 Pantaleone, Stefano|||0000-0002-2457-1065 Ceccarelli, Cecilia|||0000-0001-9664-6292 Rimola, Albert|||0000-0002-9637-4554 Ugliengo, Piero|||0000-0001-8886-9832 |
| author2_role |
author author author author author |
| dc.subject.none.fl_str_mv |
Astrochemistry Molecular data Protoplanetary discs ISM: clouds ISM: molecules |
| topic |
Astrochemistry Molecular data Protoplanetary discs ISM: clouds ISM: molecules |
| description |
Methanol (CH 3 OH) is the simplest and most abundant interstellar complex organic molecule (iCOM) observed in warm and cold environments. It is thought to be formed on the surfaces of dust grains and released into the gas-phase by thermal desorption of the ices in the warm regions where the dust temperature is high ( ≥100 K). Ho we ver, the presence of gaseous methanol in cold environments represented a challenge since its detection, e.g. in cold molecular clouds, prestellar cores, and protoplanetary discs. The reason is that thermal desorption was thought to be completely inefficient in these conditions. In this work, we show that this is not the case. Specifically, we present new calculations of the binding energy (BE) distribution on an iced grain composed of 200 water molecules. On this grain we obtained 223 unique sites with different BE. We found that the methanol BE distribution is well reproduced by a Gaussian function with a mean of 35.5 kJ mol -1 (4255 K) and a standard deviation of 13.0 kJ mol -1 (1558 K). To facilitate the incorporation of our calculations into astrochemical models, we provide a table with the fraction of sites as a function of the BE and the corresponding prefactors. Comparison with published experimental BE values suggests that they are dominated by the larger BE sites. Finally, and most importantly, our calculations show that 2 per cent of the BEs are around 10 kJ mol -1 (1240 K), implying that thermal desorption from these sites may explain the presence of gaseous methanol in cold environments. |
| publishDate |
2025 |
| dc.date.none.fl_str_mv |
2 2025-01-01 2025 2025-01-01 |
| dc.type.none.fl_str_mv |
Article http://purl.org/coar/resource_type/c_6501 VoR http://purl.org/coar/version/c_970fb48d4fbd8a85 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
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article |
| dc.identifier.none.fl_str_mv |
https://ddd.uab.cat/record/324283 https://dx.doi.org/urn:doi:10.1093/mnras/staf476 |
| url |
https://ddd.uab.cat/record/324283 https://dx.doi.org/urn:doi:10.1093/mnras/staf476 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.relation.none.fl_str_mv |
European Commission https://doi.org/10.13039/501100000780 741002 European Commission https://doi.org/10.13039/501100000780 865657 European Commission https://doi.org/10.13039/501100000780 811312 Agencia Estatal de Investigación https://doi.org/10.13039/501100011033 PID2021-126427NB-I00 Ministerio de Ciencia e Innovación https://doi.org/10.13039/501100004837 CNS2023-144902 |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by/4.0/ |
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info:eu-repo/semantics/openAccess |
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open access http://purl.org/coar/access_right/c_abf2 https://creativecommons.org/licenses/by/4.0/ |
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openAccess |
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application/pdf |
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