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Modelling carbon-chain species formation in lukewarm corinos with new multi-phase models
Wang, Yao1,2,3; Chang, Qiang4; Wang, Hongchi1,2
2019-02-20
Source PublicationASTRONOMY & ASTROPHYSICS
ISSN1432-0746
Volume622Pages:11
Corresponding AuthorWang, Yao(wangyao@pmo.ac.cn)
AbstractContext. Abundant carbon-chain species have been observed towards lukewarm corinos L1527, B228, and L483. These carbon-chain species are believed to be synthesized in the gas phase after CH4 desorbs from the dust grain surface at the temperature around 30 K. Aims. We investigate carbon-chain species formation in lukewarm corinos using a more rigorous numerical method and advanced surface chemical models. We also pay attention to the significance of the finite size effect. Methods. We used the macroscopic Monte Carlo method in our simulations. In addition to the two-phase model, the basic multi-phase model and the new multi-phase models were used for modelling surface chemistry on dust grains. All volatile species can sublime at their sublimation temperatures in the two-phase model while most volatile species are frozen in the ice mantle before water ice sublimes in the basic and the new multi-phase models. The new multi-phase models allow more volatile species to sublime at their sublimation temperatures than the basic multi-phase model does. Results. The significance of the finite size effect is dependent on the duration of the cold phase. The discrepancies between the rate equation approach and the Monte Carlo method decrease as the duration of the cold phase increases. When T similar to 30 K, the abundances of gaseous CH4 and CO in the two-phase model are the highest while the basic multi-phase model predicts the lowest CO and CH4 abundances among all models. The abundances of carbon-chain species in the basic and the new multi-phase models are lower than that in the two-phase model when T similar to 30 K because CH4 is crucial for the synthesis of carbon-chain species. However, because the abundance of electrons increases as the abundance of H3O+ decreases, some carbon-chain species abundances predicted by the basic multi-phase model may not be lower than that in the new multi-phase models. The two-phase model performs best in predicting carbon-chain species abundances to fit observations while the basic multi-phase model works the worst. The abundances of carbon-chain species predicted by the new multi-phase models agree reasonably well with observations. Conclusions. The amount of CH4 can diffuse inside the ice mantle, thus sublime upon warm-up plays a crucial role in the synthesis of carbon-chain species in the gas phase. The carbon-chain species observed in lukewarm corinos may be able to gauge surface chemical models.
Keywordastrochemistry ISM: abundances ISM: individual objects: L1527 ISM: individual objects: B228 ISM: individual objects: L483 ISM: molecules
DOI10.1051/0004-6361/201834276
WOS KeywordLOW-MASS PROTOSTAR ; CHEMISTRY SOURCE ; HOT CORINO ; MOLECULES ; CORES ; DUST ; CIRCUMSTELLAR ; EVOLUTION ; SEARCH ; CLOUDS
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000459092200001
PublisherEDP SCIENCES S A
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/18652
Collection中国科学院紫金山天文台
Corresponding AuthorWang, Yao
Affiliation1.Chinese Acad Sci, Purple Mt Observ, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron, 8 Yuanhua Rd, Nanjing 210034, Jiangsu, Peoples R China
3.Univ Sci & Technol China, 96 Jinzhai Rd, Hefei 230026, Anhui, Peoples R China
4.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China
Recommended Citation
GB/T 7714
Wang, Yao,Chang, Qiang,Wang, Hongchi. Modelling carbon-chain species formation in lukewarm corinos with new multi-phase models[J]. ASTRONOMY & ASTROPHYSICS,2019,622:11.
APA Wang, Yao,Chang, Qiang,&Wang, Hongchi.(2019).Modelling carbon-chain species formation in lukewarm corinos with new multi-phase models.ASTRONOMY & ASTROPHYSICS,622,11.
MLA Wang, Yao,et al."Modelling carbon-chain species formation in lukewarm corinos with new multi-phase models".ASTRONOMY & ASTROPHYSICS 622(2019):11.
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