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
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/167174
Ver los metadatos del registro completo
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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) |
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application/pdf |
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