ALMA observations of CO isotopologues towards six obscured post-AGB stars

18 pages, 8 figures, 4 tables

Detalhes bibliográficos
Autores: Khouri, T., Tafoya, D., Vlemmings, W. H. T., Olofsson, H., Sánchez Contreras, C., Alcolea, J., Gómez, J. F., Velilla Prieto, L., Sahai, R., Santander-García, M., Bujarrabal, V., Karakas, A., Saberi, M., Gallardo Cava, I., Imai, H., Pérez-Sánchez, A. F.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2025
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/387281
Acesso em linha:http://hdl.handle.net/10261/387281
http://arxiv.org/abs/2501.04492v1
Access Level:Acceso aberto
Palavra-chave:Circumstellar matter
Stars: AGB and post-AGB
Stars: evolution
Stars: jets
Stars: kinematics and dynamics
Stars: winds, outflows
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network_name_str España
repository_id_str
dc.title.none.fl_str_mv ALMA observations of CO isotopologues towards six obscured post-AGB stars
title ALMA observations of CO isotopologues towards six obscured post-AGB stars
spellingShingle ALMA observations of CO isotopologues towards six obscured post-AGB stars
Khouri, T.
Circumstellar matter
Stars: AGB and post-AGB
Stars: evolution
Stars: jets
Stars: kinematics and dynamics
Stars: winds, outflows
title_short ALMA observations of CO isotopologues towards six obscured post-AGB stars
title_full ALMA observations of CO isotopologues towards six obscured post-AGB stars
title_fullStr ALMA observations of CO isotopologues towards six obscured post-AGB stars
title_full_unstemmed ALMA observations of CO isotopologues towards six obscured post-AGB stars
title_sort ALMA observations of CO isotopologues towards six obscured post-AGB stars
dc.creator.none.fl_str_mv Khouri, T.
Tafoya, D.
Vlemmings, W. H. T.
Olofsson, H.
Sánchez Contreras, C.
Alcolea, J.
Gómez, J. F.
Velilla Prieto, L.
Sahai, R.
Santander-García, M.
Bujarrabal, V.
Karakas, A.
Saberi, M.
Gallardo Cava, I.
Imai, H.
Pérez-Sánchez, A. F.
author Khouri, T.
author_facet Khouri, T.
Tafoya, D.
Vlemmings, W. H. T.
Olofsson, H.
Sánchez Contreras, C.
Alcolea, J.
Gómez, J. F.
Velilla Prieto, L.
Sahai, R.
Santander-García, M.
Bujarrabal, V.
Karakas, A.
Saberi, M.
Gallardo Cava, I.
Imai, H.
Pérez-Sánchez, A. F.
author_role author
author2 Tafoya, D.
Vlemmings, W. H. T.
Olofsson, H.
Sánchez Contreras, C.
Alcolea, J.
Gómez, J. F.
Velilla Prieto, L.
Sahai, R.
Santander-García, M.
Bujarrabal, V.
Karakas, A.
Saberi, M.
Gallardo Cava, I.
Imai, H.
Pérez-Sánchez, A. F.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Swedish Research Council
Ministerio de Ciencia e Innovación (España)
NASA Jet Propulsion Laboratory
NASA
Australian Research Council
Research Council of Norway
Khouri, T. [0000-0002-5680-9525]
#NODATA#
#NODATA#
Olofsson, H. [0000-0002-8567-9424]
Sánchez Contreras, C.[0000-0002-6341-592X]
Alcolea, J. [0000-0003-1968-0117]
Gómez, J. F. [0000-0002-7065-542X]
Velilla Prieto, L. [0000-0001-8275-9341]
Sahai, R. [0000-0002-6858-5063]
Santander-García, M. [0000-0002-7338-0986]
Bujarrabal, V. [0000-0002-6586-4665]
Karakas, A. [0000-0002-3625-6951]
Saberi, M. [0000-0001-7353-9101]
Gallardo Cava, I. [0000-0002-3241-6831]
Imai, H. [0000-0002-0880-0091]
Pérez-Sánchez, A. F. [0000-0002-0448-2583]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Circumstellar matter
Stars: AGB and post-AGB
Stars: evolution
Stars: jets
Stars: kinematics and dynamics
Stars: winds, outflows
topic Circumstellar matter
Stars: AGB and post-AGB
Stars: evolution
Stars: jets
Stars: kinematics and dynamics
Stars: winds, outflows
description 18 pages, 8 figures, 4 tables
publishDate 2025
dc.date.none.fl_str_mv 2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/387281
http://arxiv.org/abs/2501.04492v1
url http://hdl.handle.net/10261/387281
http://arxiv.org/abs/2501.04492v1
dc.language.none.fl_str_mv Inglés
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dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
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spelling ALMA observations of CO isotopologues towards six obscured post-AGB starsKhouri, T.Tafoya, D.Vlemmings, W. H. T.Olofsson, H.Sánchez Contreras, C.Alcolea, J.Gómez, J. F.Velilla Prieto, L.Sahai, R.Santander-García, M.Bujarrabal, V.Karakas, A.Saberi, M.Gallardo Cava, I.Imai, H.Pérez-Sánchez, A. F.Circumstellar matterStars: AGB and post-AGBStars: evolutionStars: jetsStars: kinematics and dynamicsStars: winds, outflows18 pages, 8 figures, 4 tablesContext. Low- and intermediate-mass stars evolve through the asymptotic giant branch (AGB) when an efficient mass-loss process removes a significant fraction of their initial mass. For most sources, this mass-loss process relies on the interplay between convection, stellar pulsations, and dust formation. However, predicting the mass-loss history of a given star from first principles is complex and not yet feasible at present. At the end of the AGB, at least some stars experience a substantial increase in their mass-loss rate for unknown reasons, leading to the creation of post-AGB objects that are completely enshrouded in thick dusty envelopes. Recent studies have suggested that some of these sources may be the product of interactions between an evolved star with a close companion. Aims. We observed six obscured post-AGB stars (four C-rich and two O-rich sources) to constrain the properties of their circumstellar envelopes, recent mass-loss histories, and initial masses of the central stars. Methods. We used observations of the J = 2 − 1 line of 13CO, C17O, and C18O with the Atacama Large Millimeter/submillimeter Array (ALMA) to determine the circumstellar gas masses and the 17O/18O isotopic ratios, the latter of which can be used to infer initial stellar masses. These results were interpreted in the context of comparisons with stellar evolution models in the literature and existing observations of other post-AGB stars. Results. Based on the inferred 17O/18O isotopic ratios, we find all stars to have relatively low initial masses (< 2 M⊙), contrary to literature indications of higher masses for some sources. One of the C-rich sources, HD 187885, has a low 17O/18O ratio; coupled with a low metallicity, this would imply a relatively low mass (∼1.15 M⊙) for a carbon star. For all but one source (GLMP 950), we observe kinematic components with velocities of ≳30 km s−1, which are higher than typical AGB wind expansion velocities. For most sources, these higher velocity outflows display point-symmetric morphologies. The case of Hen 3-1475 is especially spectacular, with the high-velocity molecular outflow appearing to be interleaved with the high-velocity outflow of ionised gas observed at optical wavelengths. Based on the size of the emission regions of the slow components of the outflows, we derived typical kinematic ages associated with the C18O J = 2 − 1 emission of ≲1500 years and obtained relatively high associated mass-loss rates (≳10−4 M⊙ yr−1). The sources with known spectral types are found to have evolved faster than expected, compared to stellar evolutionary models.T.K. acknowledges support from the Swedish Research Council through grants 2019-03777. JA, VB, CSC are partially supported by I+D+i project, PID2019-105203GBC21/C22, funded by the Spanish MICIU/AEI/10.13039/501100011033. JFG is f inancially supported by grants PID2020-114461GB-I00, PID2023-146295NBI00, and CEX2021-001131-S, funded by MCIN/AEI/10.13039/501100011033. L.V.-P. acknowledges support from the grant PID2020-117034RJ-I00 funded by the Spanish MCIN/AEI/10.13039/501100011033. R.S.’s contribution to the research described here was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA, and funded in part by NASA via multiple ADAP and HST GO awards. AK was supported by the Australian Research Council Centre of Excellence for All Sky Astrophysics in 3 Dimensions (ASTRO 3D), through project number CE170100013. MS acknowledges support from the Research Council of Norway via ESGC project (project No. 335497).Peer reviewedEDP SciencesSwedish Research CouncilMinisterio de Ciencia e Innovación (España)NASA Jet Propulsion LaboratoryNASAAustralian Research CouncilResearch Council of NorwayKhouri, T. [0000-0002-5680-9525]#NODATA##NODATA#Olofsson, H. [0000-0002-8567-9424]Sánchez Contreras, C.[0000-0002-6341-592X]Alcolea, J. [0000-0003-1968-0117]Gómez, J. F. [0000-0002-7065-542X]Velilla Prieto, L. [0000-0001-8275-9341]Sahai, R. [0000-0002-6858-5063]Santander-García, M. [0000-0002-7338-0986]Bujarrabal, V. [0000-0002-6586-4665]Karakas, A. [0000-0002-3625-6951]Saberi, M. [0000-0001-7353-9101]Gallardo Cava, I. [0000-0002-3241-6831]Imai, H. [0000-0002-0880-0091]Pérez-Sánchez, A. F. [0000-0002-0448-2583]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/387281http://arxiv.org/abs/2501.04492v1reponame:DIGITAL.CSIC. 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