From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties

[Context] Models of astrophysical dust are key to understanding several physical processes, from the role of dust grains as cooling agents in the interstellar medium (ISM) to their evolution in dense circumstellar discs, explaining the occurrence of planetary systems around many stars. Currently, mo...

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Detalhes bibliográficos
Autores: Carpine, Marie-Anne, Ysard, Nathalie, Maury, Anaëlle, Jones, Anthony
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2025
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/398671
Acesso em linha:http://hdl.handle.net/10261/398671
http://arxiv.org/abs/2504.20578v1
Access Level:acceso abierto
Palavra-chave:Dust, extinction
Evolution
Methods: numerical
Protoplanetary disks
Stars: formation
Stars: protostars
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oai_identifier_str oai:digital.csic.es:10261/398671
network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties
title From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties
spellingShingle From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties
Carpine, Marie-Anne
Dust, extinction
Evolution
Methods: numerical
Protoplanetary disks
Stars: formation
Stars: protostars
title_short From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties
title_full From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties
title_fullStr From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties
title_full_unstemmed From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties
title_sort From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical properties
dc.creator.none.fl_str_mv Carpine, Marie-Anne
Ysard, Nathalie
Maury, Anaëlle
Jones, Anthony
author Carpine, Marie-Anne
author_facet Carpine, Marie-Anne
Ysard, Nathalie
Maury, Anaëlle
Jones, Anthony
author_role author
author2 Ysard, Nathalie
Maury, Anaëlle
Jones, Anthony
author2_role author
author
author
dc.contributor.none.fl_str_mv European Research Council
European Commission
Carpine, Marie-Anne [0009-0003-8171-1276]
Maury, Anaëlle [0000-0002-3801-8754]
Jones, Anthony [0000-0003-0577-6425]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Dust, extinction
Evolution
Methods: numerical
Protoplanetary disks
Stars: formation
Stars: protostars
topic Dust, extinction
Evolution
Methods: numerical
Protoplanetary disks
Stars: formation
Stars: protostars
description [Context] Models of astrophysical dust are key to understanding several physical processes, from the role of dust grains as cooling agents in the interstellar medium (ISM) to their evolution in dense circumstellar discs, explaining the occurrence of planetary systems around many stars. Currently, most models aim to provide optical properties for dust grains in the diffuse ISM, and many do not account properly for complexity in terms of composition and structure when dust is expected to evolve in dense astrophysical environments.
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/10261/398671
http://arxiv.org/abs/2504.20578v1
url http://hdl.handle.net/10261/398671
http://arxiv.org/abs/2504.20578v1
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/EC/HE/101098309
https://doi.org/10.1051/0004-6361/202554575
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
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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spelling From small dust to micron-sized aggregates: the influence of structure and composition on the dust optical propertiesCarpine, Marie-AnneYsard, NathalieMaury, AnaëlleJones, AnthonyDust, extinctionEvolutionMethods: numericalProtoplanetary disksStars: formationStars: protostars[Context] Models of astrophysical dust are key to understanding several physical processes, from the role of dust grains as cooling agents in the interstellar medium (ISM) to their evolution in dense circumstellar discs, explaining the occurrence of planetary systems around many stars. Currently, most models aim to provide optical properties for dust grains in the diffuse ISM, and many do not account properly for complexity in terms of composition and structure when dust is expected to evolve in dense astrophysical environments.[Aims] Our purpose is to investigate, with a pilot sample of micron-size dust grains, the influence of hypotheses made about the dust structure, porosity, and composition when computing the optical properties of grown dust grains. We aim to produce a groundwork for building comprehensive yet realistic optical properties that accurately represent dust grains as they are expected to evolve in the dense clouds, cores, and discs. We are especially interested in exploring these effects on the resulting optical properties in the infrared and millimetre domains, where observations of these objects are widely used to constrain the dust properties.[Methods] Starting from the small dust grains developed in the THEMIS 2.0 model, we used the discrete dipole approximation to compute the optical properties of 1 μm grains, varying the hypotheses made about their composition and structure. We looked at the dust scattering, emission, and extinction to isolate potential simplifications and unavoidable differences between grain structures.[Results] We note significant differences in the optical properties depending on the dust structure and composition. Both the dust structure and porosity influence the dust properties in infrared and millimetre ranges, demonstrating that dust aggregates cannot be correctly approximated by compact or porous spheres. In particular, we show that the dust emissivity index in the millimetre can vary with fixed grain size.[Conclusions] Our work sheds light on the importance of taking the dust structure and porosity into account when interpreting observations in astrophysical environments where dust grains may have evolved significantly. For example, measuring the dust sizes using the emissivity index from millimetre observations of the dust thermal emission is a good but degenerate tool, as we observe differences of up to 25% in the dust emissivity index with compact or aggregate grains, varying in composition and structure. Efforts in carrying out physical models of grain growth, for instance, are required to establish realistic constraints on the structure of grown dust grains, and will be used in the future to build realistic dust models for the dense ISM.This project was provided with computing HPC and storage resources by GENCI at TGCC thanks to the grant 2024-A0170415717 on the supercomputer Joliot Curie’s ROME partition. Color sequences in plots of this project are designed to be accessible thanks to Petroff (2021). This work was made possible thanks to the support from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 101098309 – PEBBLES).Peer reviewedEDP SciencesEuropean Research CouncilEuropean CommissionCarpine, Marie-Anne [0009-0003-8171-1276]Maury, Anaëlle [0000-0002-3801-8754]Jones, Anthony [0000-0003-0577-6425]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/10261/398671http://arxiv.org/abs/2504.20578v1reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/EC/HE/101098309https://doi.org/10.1051/0004-6361/202554575Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/3986712026-05-22T06:33:51Z
score 15,81155

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