Afficher la notice abrégée

Polarization in the GG Tau Ring—Confronting Dust Self-scattering, Dust Mechanical and Magnetic Alignment, Spirals, and Dust Grain Drift

hal.structure.identifierAcademia Sinica Institute of Astronomy and Astrophysics [ASIAA]
dc.contributor.authorTANG, Ya-Wen
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorDUTREY, Anne
hal.structure.identifierAcademia Sinica Institute of Astronomy and Astrophysics [ASIAA]
dc.contributor.authorKOCH, Patrick
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorGUILLOTEAU, Stephane
hal.structure.identifierAcademia Sinica Institute of Astronomy and Astrophysics [ASIAA]
dc.contributor.authorYEN, Hsi-Wei
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorDI FOLCO, Emmanuel
hal.structure.identifierAstrophysique Interprétation Modélisation [AIM (UMR_7158 / UMR_E_9005 / UM_112)]
dc.contributor.authorPANTIN, Eric
hal.structure.identifierKogakuin University [Tokyo]
dc.contributor.authorMUTO, Takayuki
hal.structure.identifierNational Astronomical Observatory of Japan [NAOJ]
dc.contributor.authorKATAOKA, Akimasa
hal.structure.identifierInstitut d'astrophysique spatiale [IAS]
hal.structure.identifierDépartement d'Astrophysique (ex SAP) [DAP]
dc.contributor.authorBRAUER, Robert
dc.date.issued2023
dc.identifier.issn2041-8205
dc.description.abstractEnWe report Atacama Large Millimeter/submillimeter Array (ALMA) polarization observations at 3 and 0.9 mm toward the GG Tau A system. In the ring, the percentage is relatively homogeneous at 3 mm, being 1.2%, while it exhibits a clear radial variation at 0.9 mm with a mean increasing from 0.6% to 2.8% toward larger radius (r). The polarization orientation at r > 1 85 appears nearly azimuthal at both wavelengths. At r < 1 85, the pattern remains azimuthal at 3 mm but becomes radial at 0.9 mm. The dust self-scattering model with a max of 1 mm could reproduce the observed polarization orientation and percentage at 0.9 mm, but the expected polarization percentage at 3 mm would be 0.2%, much smaller than the detected 1.2%. Dust alignment with poloidal magnetic field could qualitatively reproduce the flip in polarization at r < 1 85 and also the detected polarization percentage. A closer inspection of the nearly azimuthal pattern reveals that polarization orientations are systematically deviating by −9°.0 ± 1°. 2 from the tangent of the orbit ellipses. This deviation agrees with the direction of the spiral pattern observed in the near-infrared, but it is unclear how dust grains could be aligned along such spirals. For the scenario where the −9°deviation (−7°. 3 after considering the inclination effect) measures the radial component of the dust drift motion, the expected inward drifting velocity would be ∼12.8% of the Keplerian speed, a factor of 2.8 larger than the theoretical predictions. Possible additional interpretations of the polarization are discussed, but there is no single mechanism that could explain the detected polarization simultaneously.
dc.language.isoen
dc.publisherBristol : IOP Publishing
dc.subject.enInterstellar medium (847)
dc.subject.enCircumstellar disks
dc.title.enPolarization in the GG Tau Ring—Confronting Dust Self-scattering, Dust Mechanical and Magnetic Alignment, Spirals, and Dust Grain Drift
dc.typeArticle de revue
dc.identifier.doi10.3847/2041-8213/acc45b
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
bordeaux.journalThe Astrophysical journal letters
bordeaux.pageL5
bordeaux.volume947
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-04220618
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-04220618v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=The%20Astrophysical%20journal%20letters&amp;rft.date=2023&amp;rft.volume=947&amp;rft.issue=1&amp;rft.spage=L5&amp;rft.epage=L5&amp;rft.eissn=2041-8205&amp;rft.issn=2041-8205&amp;rft.au=TANG,%20Ya-Wen&amp;DUTREY,%20Anne&amp;KOCH,%20Patrick&amp;GUILLOTEAU,%20Stephane&amp;YEN,%20Hsi-Wei&amp;rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée