The peculiar chemistry of the inner ejecta of Eta Carina
We investigated continuum and molecular line emission of four species (CO, HCN, H13CN, and HCO+) at 0.8 mm in the inner region around η Car, using ALMA archival observations at a resolution better than 0.2 arcsec. We report the discovery of an asymmetric extended structure north-west of the star, in...
| Autores: | , |
|---|---|
| Formato: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2019 |
| País: | España |
| Recursos: | Instituto Nacional de Técnica Aeroespacial (INTA) |
| Repositorio: | DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial |
| OAI Identifier: | oai:digital.inta.es:20.500.12666/329 |
| Acesso em linha: | https://academic.oup.com/mnras/article/490/2/1570/5571827 http://hdl.handle.net/20.500.12666/329 |
| Access Level: | acceso abierto |
| Palavra-chave: | Stars: evolution Stars: individual: η Carina Stars: massive Stars: mass-loss ISM: abundances ISM: molecules |
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The peculiar chemistry of the inner ejecta of Eta CarinaBordiu, C.Rizzo, J. R.Stars: evolutionStars: individual: η CarinaStars: massiveStars: mass-lossISM: abundancesISM: moleculesWe investigated continuum and molecular line emission of four species (CO, HCN, H13CN, and HCO+) at 0.8 mm in the inner region around η Car, using ALMA archival observations at a resolution better than 0.2 arcsec. We report the discovery of an asymmetric extended structure north-west of the star, independent from the continuum point source. The structure is only traced by continuum and HCO+, and not detected in the other lines. Kinematics of this structure reveal that the HCO+ gas likely arises from ejecta expelled in the 1890s eruption. The ejecta is propagating outwards within the cavity produced by the current wind–wind interaction of η Car A and its companion. Chemical analysis of the ejecta reveals an apparent lack of CO and nitrogen-bearing species. We explore possible explanations for this peculiar chemistry, that differentiates this structure from the ejecta of the Great Eruption, rich in HCN and H13CN. We also report an absorption component near the continuum point source, only traced by HCN and H13CN in their vibrational-ground and vibrationally excited states. This absorbing gas is attributed to a hot bullet of N-enriched material expelled at a projected velocity of 40 km s−1.We thank the anonymous referee for the insightful comments provided. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2016.1.00585.S. ALMA is a partnership of ESO (representing its member states), NSF (USA) and NINS (Japan), together with NRC (Canada), MOST and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO and NAOJ. JRR acknowledges the support from Spanish Ministerio de Economía y Competitividad under grant ESP2015-65597-C4-1-R (MINECO/FEDER, UE) and Spanish Agencia Estatal de Investigación under grant ESP2017-86582-C4-1-R (AEI/FEDER, UE). With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (MDM-2017-0737)Peer reviewOxford Academics: Oxford University PressUnidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737Rizzo, J. R. [0000-0002-8443-6631]Bordiu, C. [0000-0002-7703-0692]Ministerio de Economía y Competitividad (MINECO)Agencia Estatal de Investigación (AEI)202120212019info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501application/pdfhttps://academic.oup.com/mnras/article/490/2/1570/5571827http://hdl.handle.net/20.500.12666/329reponame:DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacialinstname:Instituto Nacional de Técnica Aeroespacial (INTA)InglésCONTRIBUCION ESPAÑOLA A LAS MISIONES ESPACIALES CRIOGENICAS SPICA Y ATHENA, POST-OPERACIONES DE HERSCHEL Y EXPLOTACION CIENTIFICA MULTIFRECUENCIAinfo:eu-repo/grantAgreement/MINECO//ESP2015-65597-C4-1-RCONTRIBUCION ESPAÑOLA EN CRIOGENIA A MISIONES ESPACIALES: DESARROLLOS PARA SPICA Y ATHENA, POST-OPERACIONES DE HERSCHEL Y EXPLOTACION CIENTIFICA MULTIFRECUENCIAinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2017-86582-C4-1-RAttribution-NonCommercial-NoDerivatives 4.0 InternationalCopyright © 2019, Oxford University Presshttps://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:digital.inta.es:20.500.12666/3292026-06-23T12:46:37Z |
| dc.title.none.fl_str_mv |
The peculiar chemistry of the inner ejecta of Eta Carina |
| title |
The peculiar chemistry of the inner ejecta of Eta Carina |
| spellingShingle |
The peculiar chemistry of the inner ejecta of Eta Carina Bordiu, C. Stars: evolution Stars: individual: η Carina Stars: massive Stars: mass-loss ISM: abundances ISM: molecules |
| title_short |
The peculiar chemistry of the inner ejecta of Eta Carina |
| title_full |
The peculiar chemistry of the inner ejecta of Eta Carina |
| title_fullStr |
The peculiar chemistry of the inner ejecta of Eta Carina |
| title_full_unstemmed |
The peculiar chemistry of the inner ejecta of Eta Carina |
| title_sort |
The peculiar chemistry of the inner ejecta of Eta Carina |
| dc.creator.none.fl_str_mv |
Bordiu, C. Rizzo, J. R. |
| author |
Bordiu, C. |
| author_facet |
Bordiu, C. Rizzo, J. R. |
| author_role |
author |
| author2 |
Rizzo, J. R. |
| author2_role |
author |
| dc.contributor.none.fl_str_mv |
Unidad de Excelencia Científica María de Maeztu Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737 Rizzo, J. R. [0000-0002-8443-6631] Bordiu, C. [0000-0002-7703-0692] Ministerio de Economía y Competitividad (MINECO) Agencia Estatal de Investigación (AEI) |
| dc.subject.none.fl_str_mv |
Stars: evolution Stars: individual: η Carina Stars: massive Stars: mass-loss ISM: abundances ISM: molecules |
| topic |
Stars: evolution Stars: individual: η Carina Stars: massive Stars: mass-loss ISM: abundances ISM: molecules |
| description |
We investigated continuum and molecular line emission of four species (CO, HCN, H13CN, and HCO+) at 0.8 mm in the inner region around η Car, using ALMA archival observations at a resolution better than 0.2 arcsec. We report the discovery of an asymmetric extended structure north-west of the star, independent from the continuum point source. The structure is only traced by continuum and HCO+, and not detected in the other lines. Kinematics of this structure reveal that the HCO+ gas likely arises from ejecta expelled in the 1890s eruption. The ejecta is propagating outwards within the cavity produced by the current wind–wind interaction of η Car A and its companion. Chemical analysis of the ejecta reveals an apparent lack of CO and nitrogen-bearing species. We explore possible explanations for this peculiar chemistry, that differentiates this structure from the ejecta of the Great Eruption, rich in HCN and H13CN. We also report an absorption component near the continuum point source, only traced by HCN and H13CN in their vibrational-ground and vibrationally excited states. This absorbing gas is attributed to a hot bullet of N-enriched material expelled at a projected velocity of 40 km s−1. |
| publishDate |
2019 |
| dc.date.none.fl_str_mv |
2019 2021 2021 |
| dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 |
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article |
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publishedVersion |
| dc.identifier.none.fl_str_mv |
https://academic.oup.com/mnras/article/490/2/1570/5571827 http://hdl.handle.net/20.500.12666/329 |
| url |
https://academic.oup.com/mnras/article/490/2/1570/5571827 http://hdl.handle.net/20.500.12666/329 |
| dc.language.none.fl_str_mv |
Inglés |
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Inglés |
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CONTRIBUCION ESPAÑOLA A LAS MISIONES ESPACIALES CRIOGENICAS SPICA Y ATHENA, POST-OPERACIONES DE HERSCHEL Y EXPLOTACION CIENTIFICA MULTIFRECUENCIA info:eu-repo/grantAgreement/MINECO//ESP2015-65597-C4-1-R CONTRIBUCION ESPAÑOLA EN CRIOGENIA A MISIONES ESPACIALES: DESARROLLOS PARA SPICA Y ATHENA, POST-OPERACIONES DE HERSCHEL Y EXPLOTACION CIENTIFICA MULTIFRECUENCIA info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2017-86582-C4-1-R |
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Attribution-NonCommercial-NoDerivatives 4.0 International Copyright © 2019, Oxford University Press https://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivatives 4.0 International Copyright © 2019, Oxford University Press https://creativecommons.org/licenses/by-nc-nd/4.0/ |
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openAccess |
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application/pdf |
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Oxford Academics: Oxford University Press |
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Oxford Academics: Oxford University Press |
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