Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system

Autores
Yang, Haifeng; Fernández López, Manuel; Li, Zhi-Yun; Stephens, Ian W.; Looney, Leslie W.
Año de publicación
2024
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We investigate the crescent-shaped dust trap in the transition disk Oph IRS 48 using well-resolved (sub) millimeter polarimetric observations at ALMA Band 7 (870 μm). The dust polarization map reveals patterns consistent with dust-scattering-induced polarization. There is a relative displacement between the polarized flux and the total flux, which holds the key to understanding the dust scale heights in this system. We model the polarization observations, focusing on the effects of dust scale heights. We find that the interplay between the inclination-induced polarization and the polarization arising from radiation anisotropy in the crescent determines the observed polarization; the anisotropy is controlled by the dust optical depth along the midplane, which is, in turn, determined by the dust scale height in the vertical direction. We find that the dust grains can be neither completely settled nor well mixed with the gas. The completely settled case produces little radial displacement between the total and polarized flux, while the well-mixed case produces an azimuthal pattern in the outer (radial) edge of the crescent that is not observed. Our best model has a gas-to-dust scale height ratio of 2 and can reproduce both the radial displacement and the azimuthal displacement between the total and polarized flux. We infer an effective turbulence α parameter of approximately 0.0001–0.005. The scattering-induced polarization provides insight into a turbulent vortex with a moderate level of dust settling in the IRS 48 system, which is hard to achieve otherwise.
Instituto Argentino de Radioastronomía
Materia
Ciencias Astronómicas
Dust continuum emission
Interferometry
Polarimetry
Protoplanetary disks
Submillimeter astronomy
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/167174

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oai_identifier_str oai:sedici.unlp.edu.ar:10915/167174
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 systemYang, HaifengFernández López, ManuelLi, Zhi-YunStephens, Ian W.Looney, Leslie W.Ciencias AstronómicasDust continuum emissionInterferometryPolarimetryProtoplanetary disksSubmillimeter astronomyWe investigate the crescent-shaped dust trap in the transition disk Oph IRS 48 using well-resolved (sub) millimeter polarimetric observations at ALMA Band 7 (870 μm). The dust polarization map reveals patterns consistent with dust-scattering-induced polarization. There is a relative displacement between the polarized flux and the total flux, which holds the key to understanding the dust scale heights in this system. We model the polarization observations, focusing on the effects of dust scale heights. We find that the interplay between the inclination-induced polarization and the polarization arising from radiation anisotropy in the crescent determines the observed polarization; the anisotropy is controlled by the dust optical depth along the midplane, which is, in turn, determined by the dust scale height in the vertical direction. We find that the dust grains can be neither completely settled nor well mixed with the gas. The completely settled case produces little radial displacement between the total and polarized flux, while the well-mixed case produces an azimuthal pattern in the outer (radial) edge of the crescent that is not observed. Our best model has a gas-to-dust scale height ratio of 2 and can reproduce both the radial displacement and the azimuthal displacement between the total and polarized flux. We infer an effective turbulence α parameter of approximately 0.0001–0.005. The scattering-induced polarization provides insight into a turbulent vortex with a moderate level of dust settling in the IRS 48 system, which is hard to achieve otherwise.Instituto Argentino de Radioastronomía2024-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfhttp://sedici.unlp.edu.ar/handle/10915/167174enginfo:eu-repo/semantics/altIdentifier/issn/1538-4357info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ad2346info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:44:30Zoai:sedici.unlp.edu.ar:10915/167174Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:44:31.045SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
title Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
spellingShingle Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
Yang, Haifeng
Ciencias Astronómicas
Dust continuum emission
Interferometry
Polarimetry
Protoplanetary disks
Submillimeter astronomy
title_short Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
title_full Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
title_fullStr Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
title_full_unstemmed Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
title_sort Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
dc.creator.none.fl_str_mv Yang, Haifeng
Fernández López, Manuel
Li, Zhi-Yun
Stephens, Ian W.
Looney, Leslie W.
author Yang, Haifeng
author_facet Yang, Haifeng
Fernández López, Manuel
Li, Zhi-Yun
Stephens, Ian W.
Looney, Leslie W.
author_role author
author2 Fernández López, Manuel
Li, Zhi-Yun
Stephens, Ian W.
Looney, Leslie W.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Dust continuum emission
Interferometry
Polarimetry
Protoplanetary disks
Submillimeter astronomy
topic Ciencias Astronómicas
Dust continuum emission
Interferometry
Polarimetry
Protoplanetary disks
Submillimeter astronomy
dc.description.none.fl_txt_mv We investigate the crescent-shaped dust trap in the transition disk Oph IRS 48 using well-resolved (sub) millimeter polarimetric observations at ALMA Band 7 (870 μm). The dust polarization map reveals patterns consistent with dust-scattering-induced polarization. There is a relative displacement between the polarized flux and the total flux, which holds the key to understanding the dust scale heights in this system. We model the polarization observations, focusing on the effects of dust scale heights. We find that the interplay between the inclination-induced polarization and the polarization arising from radiation anisotropy in the crescent determines the observed polarization; the anisotropy is controlled by the dust optical depth along the midplane, which is, in turn, determined by the dust scale height in the vertical direction. We find that the dust grains can be neither completely settled nor well mixed with the gas. The completely settled case produces little radial displacement between the total and polarized flux, while the well-mixed case produces an azimuthal pattern in the outer (radial) edge of the crescent that is not observed. Our best model has a gas-to-dust scale height ratio of 2 and can reproduce both the radial displacement and the azimuthal displacement between the total and polarized flux. We infer an effective turbulence α parameter of approximately 0.0001–0.005. The scattering-induced polarization provides insight into a turbulent vortex with a moderate level of dust settling in the IRS 48 system, which is hard to achieve otherwise.
Instituto Argentino de Radioastronomía
description We investigate the crescent-shaped dust trap in the transition disk Oph IRS 48 using well-resolved (sub) millimeter polarimetric observations at ALMA Band 7 (870 μm). The dust polarization map reveals patterns consistent with dust-scattering-induced polarization. There is a relative displacement between the polarized flux and the total flux, which holds the key to understanding the dust scale heights in this system. We model the polarization observations, focusing on the effects of dust scale heights. We find that the interplay between the inclination-induced polarization and the polarization arising from radiation anisotropy in the crescent determines the observed polarization; the anisotropy is controlled by the dust optical depth along the midplane, which is, in turn, determined by the dust scale height in the vertical direction. We find that the dust grains can be neither completely settled nor well mixed with the gas. The completely settled case produces little radial displacement between the total and polarized flux, while the well-mixed case produces an azimuthal pattern in the outer (radial) edge of the crescent that is not observed. Our best model has a gas-to-dust scale height ratio of 2 and can reproduce both the radial displacement and the azimuthal displacement between the total and polarized flux. We infer an effective turbulence α parameter of approximately 0.0001–0.005. The scattering-induced polarization provides insight into a turbulent vortex with a moderate level of dust settling in the IRS 48 system, which is hard to achieve otherwise.
publishDate 2024
dc.date.none.fl_str_mv 2024-03
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/167174
url http://sedici.unlp.edu.ar/handle/10915/167174
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1538-4357
info:eu-repo/semantics/altIdentifier/doi/10.3847/1538-4357/ad2346
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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