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Morphology of the $^{13}$CO(3-2) millimeter emission across the gas disc surrounding the triple protostar GG Tau A using ALMA observations

hal.structure.identifierAMOR 2018
dc.contributor.authorPHUONG, N. T.
dc.contributor.authorDIEP, P. N.
hal.structure.identifierAMOR 2018
dc.contributor.authorDUTREY, Anne
hal.structure.identifierAMOR 2018
dc.contributor.authorCHAPILLON, E.
dc.contributor.authorDARRIULAT, P.
hal.structure.identifierAMOR 2018
dc.contributor.authorGUILLOTEAU, S.
dc.contributor.authorHOAI, D. T.
dc.contributor.authorNHUNG, P. T.
dc.contributor.authorTANG, Y.-W.
dc.contributor.authorTHAO, N. T.
dc.contributor.authorTUAN-ANH, P.
dc.date.issued2018
dc.identifier.issn1674-4527
dc.description.abstractEnObservations by the Atacama Large Millimeter/sub-millimeter Array of the dust continuum and $^{13}$CO(3-2) millimeter emissions of the triple stellar system GG Tau A are analysed, giving evidence for a rotating gas disc and a concentric and coplanar dust ring. The present work complements an earlier analysis (Tang et al. 2016) by exploring detailed properties of the gas disc. A 95% confidence level upper limit of 0.24 arcsec (34 au) is placed on the disc scale height at a distance of 1 arcsec (140 au) from the central stars. Evidence for Keplerian rotation of the gas disc is presented, the rotation velocity reaching ~3.1 kms$^{-1}$ at 1 arcsec from the central stars, and a 99% confidence level upper limit of 9% is placed on a possible in-fall velocity relative contribution. Variations of the intensity across the disc area are studied in detail and confirm the presence of a hot spot in the south-eastern quadrant. However several other significant intensity variations, in particular a depression in the northern direction, are also revealed. Variations of the intensity are found to be positively correlated to variations of the line width. Possible contributions to the measured line width are reviewed, suggesting an increase of the disc temperature and opacity with decreasing distance from the stars.
dc.language.isoen
dc.publisherIOP Publishing
dc.subject.enAstrophysics - Solar and Stellar Astrophysics
dc.subject.enAstrophysics - Astrophysics of Galaxies
dc.title.enMorphology of the $^{13}$CO(3-2) millimeter emission across the gas disc surrounding the triple protostar GG Tau A using ALMA observations
dc.typeArticle de revue
dc.identifier.doi10.1088/1674-4527/18/3/31
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.identifier.arxiv1801.00861
bordeaux.journalResearch in Astronomy and Astrophysics
bordeaux.pageid. 031
bordeaux.volume18
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-01687012
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01687012v1
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