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

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 bet...

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Autores principales: Yang, Haifeng, Fernández López, Manuel, Li, Zhi-Yun, Stephens, Ian W., Looney, Leslie W.
Formato: Articulo
Lenguaje:Inglés
Publicado: 2024
Materias:
Ciencias Astronómicas
Dust continuum emission
Interferometry
Polarimetry
Protoplanetary disks
Submillimeter astronomy
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/167174
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-167174
record_format dspace
spelling I19-R120-10915-1671742024-06-12T20:06:43Z http://sedici.unlp.edu.ar/handle/10915/167174 Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system Yang, Haifeng Fernández López, Manuel Li, Zhi-Yun Stephens, Ian W. Looney, Leslie W. 2024-03 2024-06-12T18:23:41Z en Ciencias Astronómicas Dust continuum emission Interferometry Polarimetry Protoplanetary disks Submillimeter astronomy 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 Articulo Articulo http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) application/pdf
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Astronómicas
Dust continuum emission
Interferometry
Polarimetry
Protoplanetary disks
Submillimeter astronomy
spellingShingle Ciencias Astronómicas
Dust continuum emission
Interferometry
Polarimetry
Protoplanetary disks
Submillimeter astronomy
Yang, Haifeng
Fernández López, Manuel
Li, Zhi-Yun
Stephens, Ian W.
Looney, Leslie W.
Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
topic_facet Ciencias Astronómicas
Dust continuum emission
Interferometry
Polarimetry
Protoplanetary disks
Submillimeter astronomy
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.
format Articulo
Articulo
author Yang, Haifeng
Fernández López, Manuel
Li, Zhi-Yun
Stephens, Ian W.
Looney, Leslie W.
author_facet Yang, Haifeng
Fernández López, Manuel
Li, Zhi-Yun
Stephens, Ian W.
Looney, Leslie W.
author_sort Yang, Haifeng
title Turbulent vortex with moderate dust settling probed by scattering-induced polarization in the IRS 48 system
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
publishDate 2024
url http://sedici.unlp.edu.ar/handle/10915/167174
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AT fernandezlopezmanuel turbulentvortexwithmoderatedustsettlingprobedbyscatteringinducedpolarizationintheirs48system
AT lizhiyun turbulentvortexwithmoderatedustsettlingprobedbyscatteringinducedpolarizationintheirs48system
AT stephensianw turbulentvortexwithmoderatedustsettlingprobedbyscatteringinducedpolarizationintheirs48system
AT looneylesliew turbulentvortexwithmoderatedustsettlingprobedbyscatteringinducedpolarizationintheirs48system
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