H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor

19 pages, 18 figures, 2 tables

Detalles Bibliográficos
Autores: Goicoechea, Javier R., Roncero, Octavio, Roueff, Evelyne, Black, John H., Schroetter, Ilane, Berné, Olivier
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:10261/417610
Acceso en línea:http://hdl.handle.net/10261/417610
http://arxiv.org/abs/2506.05189v3
Access Level:acceso abierto
Palabra clave:Astrochemistry
ISM: molecules
Photon-dominated region (PDR)
Protoplanetary disks
Astro-ph.GA
physics
Astronomy
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repository_id_str
spelling H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vaporGoicoechea, Javier R.Roncero, OctavioRoueff, EvelyneBlack, John H.Schroetter, IlaneBerné, OlivierAstrochemistryISM: moleculesPhoton-dominated region (PDR)Protoplanetary disksAstro-ph.GAphysicsAstronomy19 pages, 18 figures, 2 tablesThe likely JWST detection of vibrationally excited H3+ emission in Orion's irradiated disk system d203-506 raises the important question of whether cosmic-ray ionization is enhanced in disks within clustered star-forming regions, or whether alternative mechanisms contribute to H3+ formation and excitation. We present a detailed model of the photodissociation region (PDR) component of a protoplanetary disk -comprising the outer disk surface and the photoevaporative wind - exposed to strong external far-ultraviolet (FUV) radiation. We investigate key gas-phase reactions involving excited H2 that lead to the formation of H3+ in the PDR, including detailed state-to-state dynamical calculations of reactions H2(v>=0) + HOC+ -> H3+ + CO and H2(v>=0) + H+ -> H2+ + H. We also consider the effects of photoionization of vibrationally excited H2(v>=4), a process not previously included in PDR or disk models. We find that these FUV-driven reactions dominate the formation of H3+ in the PDR of strongly irradiated disks, largely independently of cosmic-ray ionization. The predicted H3+ abundance in the disk PDR peaks at x(H3+)~1E-8, coinciding with regions of enhanced HOC+ and water vapor abundances, and is linked to the strength of the external FUV field (G0). The predicted H3+ column density (~1E13 cm^-2) agrees with the presence of H3+ in the PDR of d203-506. We also find that formation pumping, resulting from exoergic reactions between excited H2 and HOC+, drives the vibrational excitation of H3+ in these regions. We expect this photochemistry to be highly active in disks where G_0 > 1E3. The H3+ formation pathways studied here may also be relevant in the inner disk region (near the host star), in exoplanetary ionospheres, and in the early Universe.We also thank the PDRs4All team for stimulating discussions over the past few years. JRG and OR thank the Spanish MCINN for funding support under grants PID2023-146667NB-I00 and PID2021-122549NB-C21. We thank the PCMI of CNRS/INSU with INC/INP, co-funded by CEA and CNESPeer reviewedEDP SciencesMinisterio de Ciencia e Innovación (España)Centre National de la Recherche Scientifique (France)Centre National D'Etudes Spatiales (France)Goicoechea, Javier R. [0000-0001-7046-4319]Roncero, Octavio [0000-0002-8871-4846]Roueff, Evelyne [0000-0002-4949-8562]Black, John H. [0000-0001-7221-7207]Schroetter, Ilane [0000-0002-1099-7401]#NODATA#Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202620262025info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/417610http://arxiv.org/abs/2506.05189v3reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-146667NB-I00info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-122549NB-C21https://doi.org/10.1051/0004-6361/202555842Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/4176102026-05-22T06:33:51Z
dc.title.none.fl_str_mv H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor
title H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor
spellingShingle H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor
Goicoechea, Javier R.
Astrochemistry
ISM: molecules
Photon-dominated region (PDR)
Protoplanetary disks
Astro-ph.GA
physics
Astronomy
title_short H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor
title_full H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor
title_fullStr H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor
title_full_unstemmed H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor
title_sort H3+ in irradiated protoplanetary disks: Linking far-ultraviolet radiation and water vapor
dc.creator.none.fl_str_mv Goicoechea, Javier R.
Roncero, Octavio
Roueff, Evelyne
Black, John H.
Schroetter, Ilane
Berné, Olivier
author Goicoechea, Javier R.
author_facet Goicoechea, Javier R.
Roncero, Octavio
Roueff, Evelyne
Black, John H.
Schroetter, Ilane
Berné, Olivier
author_role author
author2 Roncero, Octavio
Roueff, Evelyne
Black, John H.
Schroetter, Ilane
Berné, Olivier
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Centre National de la Recherche Scientifique (France)
Centre National D'Etudes Spatiales (France)
Goicoechea, Javier R. [0000-0001-7046-4319]
Roncero, Octavio [0000-0002-8871-4846]
Roueff, Evelyne [0000-0002-4949-8562]
Black, John H. [0000-0001-7221-7207]
Schroetter, Ilane [0000-0002-1099-7401]
#NODATA#
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Astrochemistry
ISM: molecules
Photon-dominated region (PDR)
Protoplanetary disks
Astro-ph.GA
physics
Astronomy
topic Astrochemistry
ISM: molecules
Photon-dominated region (PDR)
Protoplanetary disks
Astro-ph.GA
physics
Astronomy
description 19 pages, 18 figures, 2 tables
publishDate 2025
dc.date.none.fl_str_mv 2025
2026
2026
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/10261/417610
http://arxiv.org/abs/2506.05189v3
url http://hdl.handle.net/10261/417610
http://arxiv.org/abs/2506.05189v3
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2023-146667NB-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/PID2021-122549NB-C21
https://doi.org/10.1051/0004-6361/202555842
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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