Gas infall via accretion disk feeding Cepheus A HW2
The star-forming region Cepheus A hosts a very young star, called HW2, that is the second closest to us growing a dozen times more massive than our Sun. The circumstellar environment surrounding HW2 has been the subject of extensive debate on the possible presence of an accretion disk, whose existen...
| Autores: | , , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/399910 |
| Acceso en línea: | http://hdl.handle.net/10261/399910 http://arxiv.org/abs/2502.15070v1 |
| Access Level: | acceso abierto |
| Palabra clave: | Circumstellar matter Stars: formation Stars: kinematics and dynamics Stars: massive Stars: protostars |
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Gas infall via accretion disk feeding Cepheus A HW2 |
| title |
Gas infall via accretion disk feeding Cepheus A HW2 |
| spellingShingle |
Gas infall via accretion disk feeding Cepheus A HW2 Sanna, Alberto Circumstellar matter Stars: formation Stars: kinematics and dynamics Stars: massive Stars: protostars |
| title_short |
Gas infall via accretion disk feeding Cepheus A HW2 |
| title_full |
Gas infall via accretion disk feeding Cepheus A HW2 |
| title_fullStr |
Gas infall via accretion disk feeding Cepheus A HW2 |
| title_full_unstemmed |
Gas infall via accretion disk feeding Cepheus A HW2 |
| title_sort |
Gas infall via accretion disk feeding Cepheus A HW2 |
| dc.creator.none.fl_str_mv |
Sanna, Alberto Oliva, Andrè Moscadelli, Luca Carrasco-González, Carlos Giannetti, Andrea Sabatini, Giovanni Beltrán, María Teresa Brogan, C. Hunter, Todd R. Torrelles, José M. Rodríguez-Kamenetzky, Adriana Caratti o Garatti, Alessio Kuiper, Rolf |
| author |
Sanna, Alberto |
| author_facet |
Sanna, Alberto Oliva, Andrè Moscadelli, Luca Carrasco-González, Carlos Giannetti, Andrea Sabatini, Giovanni Beltrán, María Teresa Brogan, C. Hunter, Todd R. Torrelles, José M. Rodríguez-Kamenetzky, Adriana Caratti o Garatti, Alessio Kuiper, Rolf |
| author_role |
author |
| author2 |
Oliva, Andrè Moscadelli, Luca Carrasco-González, Carlos Giannetti, Andrea Sabatini, Giovanni Beltrán, María Teresa Brogan, C. Hunter, Todd R. Torrelles, José M. Rodríguez-Kamenetzky, Adriana Caratti o Garatti, Alessio Kuiper, Rolf |
| author2_role |
author author author author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Istituto Nazionale di Astrofisica State Secretariat for Education, Research and Innovation (Switzerland) Universidad de Costa Rica European Commission European Research Council Consejo Nacional de Humanidades, Ciencias y Tecnologías (México) Ministero dell'Università e della Ricerca Agencia Estatal de Investigación (España) Ministerio de Ciencia e Innovación (España) Sanna, Alberto [0000-0001-7960-4912] Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72] |
| dc.subject.none.fl_str_mv |
Circumstellar matter Stars: formation Stars: kinematics and dynamics Stars: massive Stars: protostars |
| topic |
Circumstellar matter Stars: formation Stars: kinematics and dynamics Stars: massive Stars: protostars |
| description |
The star-forming region Cepheus A hosts a very young star, called HW2, that is the second closest to us growing a dozen times more massive than our Sun. The circumstellar environment surrounding HW2 has been the subject of extensive debate on the possible presence of an accretion disk, whose existence is at the foundation of our current paradigm of star formation. Here, we look to answer this long-standing question by resolving the gaseous disk component and its kinematics through sensitive observations at centrimetre (cm) wavelengths of hot ammonia (NH3) with the Jansky Very Large Array. We mapped the accretion disk surrounding HW2 at radii between 200 and 700 au, showing how fast circumstellar gas collapses and slowly orbits to pile up near the young star at very high rates of 2 × 10−3 M⊙ yr−1. These results, corroborated by state-of-the-art simulations, show that an accretion disk is still efficient in terms of focusing huge mass-infall rates near the young star, even after this star had already achieved a large mass of 16 M⊙. |
| 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 |
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article |
| status_str |
publishedVersion |
| dc.identifier.none.fl_str_mv |
http://hdl.handle.net/10261/399910 http://arxiv.org/abs/2502.15070v1 |
| url |
http://hdl.handle.net/10261/399910 http://arxiv.org/abs/2502.15070v1 |
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Inglés |
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Inglés |
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#PLACEHOLDER_PARENT_METADATA_VALUE# #PLACEHOLDER_PARENT_METADATA_VALUE# #PLACEHOLDER_PARENT_METADATA_VALUE# info:eu-repo/grantAgreement/EC/H2020/833925 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-146675NB-I00 info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2020-001058-M https://doi.org/10.1051/0004-6361/202450330 Sí |
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info:eu-repo/semantics/openAccess |
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openAccess |
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application/pdf |
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EDP Sciences |
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EDP Sciences |
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reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC instname:Consejo Superior de Investigaciones Científicas (CSIC) |
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Consejo Superior de Investigaciones Científicas (CSIC) |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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DIGITAL.CSIC. Repositorio Institucional del CSIC |
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1869407597418774528 |
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Gas infall via accretion disk feeding Cepheus A HW2Sanna, AlbertoOliva, AndrèMoscadelli, LucaCarrasco-González, CarlosGiannetti, AndreaSabatini, GiovanniBeltrán, María TeresaBrogan, C.Hunter, Todd R.Torrelles, José M.Rodríguez-Kamenetzky, AdrianaCaratti o Garatti, AlessioKuiper, RolfCircumstellar matterStars: formationStars: kinematics and dynamicsStars: massiveStars: protostarsThe star-forming region Cepheus A hosts a very young star, called HW2, that is the second closest to us growing a dozen times more massive than our Sun. The circumstellar environment surrounding HW2 has been the subject of extensive debate on the possible presence of an accretion disk, whose existence is at the foundation of our current paradigm of star formation. Here, we look to answer this long-standing question by resolving the gaseous disk component and its kinematics through sensitive observations at centrimetre (cm) wavelengths of hot ammonia (NH3) with the Jansky Very Large Array. We mapped the accretion disk surrounding HW2 at radii between 200 and 700 au, showing how fast circumstellar gas collapses and slowly orbits to pile up near the young star at very high rates of 2 × 10−3 M⊙ yr−1. These results, corroborated by state-of-the-art simulations, show that an accretion disk is still efficient in terms of focusing huge mass-infall rates near the young star, even after this star had already achieved a large mass of 16 M⊙.Comments from an anonymous referee, which helped improving our paper, are gratefully acknowledged. This paper makes use of data obtained with the Karl G. Jansky Very Large Array, operated by the National Radio Astronomy Observatory (NRAO). The NRAO is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This paper makes use of the Grenoble Image and Line Data Analysis Software (GILDAS) – https://www.iram.fr/IRAMFR/GILDAS. A.S. acknowledges financial support from the INAF-Minigrant 2022 “Feasibility project for the ngVLA: a Science Case with Masers” (ngVLAmas, P.I.: A. Sanna). A.O. acknowledges financial support from the State Secretariat for Education, Research and Innovation of the Swiss Confederation via their program “Swiss Government Excellence Scholarships for Foreign Students 2023/2024”, the Office of International Affairs and External Cooperation of the University of Costa Rica, and the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 833925, project STAREX). C.C.-G. acknowledges support from UNAM DGAPA-PAPIIT grant IG101224 and from CONAHCyT Ciencia de Frontera project ID 86372. G.S acknowledges the project PRIN-MUR 2020 MUR BEYOND-2p “Astrochemistry beyond the second period elements” (Prot. 2020AFB3FX) and the INAF-Minigrant 2023 “TRacing the chemIcal hEritage of our originS: from proTostars to planEts” (TRIESTE, PI: G. Sabatini). J.M.T. acknowledges partial support from the PID2023-146675NB grant funded by MCIN/AEI/10.13039/501100011033, and by the program Unidad de Excelencia María de Maeztu CEX2020-001058-M. A.C.G. acknowledges support from PRIN-MUR 2022 20228JPA3A “The path to star and planet formation in the JWST era” (PATH) funded by NextGeneration EU, by INAF-GoG 2022 “NIR-dark Accretion Outbursts in Massive Young stellar objects” (NAOMY), and by Large Grant INAF 2022 “YSOs Outflows, Disks and Accretion: towards a global framework for the evolution of planet forming systems” (YODA).With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (CEX2020-001058-M)Peer reviewedEDP SciencesIstituto Nazionale di AstrofisicaState Secretariat for Education, Research and Innovation (Switzerland)Universidad de Costa RicaEuropean CommissionEuropean Research CouncilConsejo Nacional de Humanidades, Ciencias y Tecnologías (México)Ministero dell'Università e della RicercaAgencia Estatal de Investigación (España)Ministerio de Ciencia e Innovación (España)Sanna, Alberto [0000-0001-7960-4912]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/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/399910http://arxiv.org/abs/2502.15070v1reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/H2020/833925info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-146675NB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2020-001058-Mhttps://doi.org/10.1051/0004-6361/202450330Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3999102026-05-22T06:33:51Z |
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15,811543 |