Morphology of the ~(13)CO(3–2) millimetre emission across the gas disc surrounding the triple protostar GG Tau A using ALMA observations

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英文篇名：Morphology of the ~(13)CO(3–2) millimetre emission across the gas disc surrounding the triple protostar GG Tau A using ALMA observations 作者：Nguyen ; Thi ; Phuong ; Pham ; Ngoc ; Diep ; Anne ; Dutrey ; Edwige ; Chapillon ; Pierre ; Darriulat ; Stéphane ; Guilloteau ; Do ; Thi ; Hoai ; Pham ; Tuyet ; Nhung ; Ya-Wen ; Tang ; Nguyen ; Thi ; Thao ; Pham ; Tuan-Anh 英文作者：Nguyen Thi Phuong;Pham Ngoc Diep;Anne Dutrey;Edwige Chapillon;Pierre Darriulat;Stéphane Guilloteau;Do Thi Hoai;Pham Tuyet Nhung;Ya-Wen Tang;Nguyen Thi Thao;Pham Tuan-Anh;Department of Astrophysics,Vietnam National Space Center,Vietnam Academy of Science and Technology;Graduate University of Science and Technology,Vietnam Academy of Science and Technology;Laboratoire d’Astrophysique de Bordeaux,Université de Bordeaux;IRAM,F-38406 Saint Martin d’Hères Cedex;Academia Sinica,Institute of Astronomy and Astrophysics; 英文关键词：protoplanetary disks;;stars:low-mass;;stars:individual(GG Tau A) 中文刊名：TTWL 英文刊名：天文和天体物理学研究(英文版) 机构：Department of Astrophysics,Vietnam National Space Center,Vietnam Academy of Science and Technology;Graduate University of Science and Technology,Vietnam Academy of Science and Technology;Laboratoire d’Astrophysique de Bordeaux,Université de Bordeaux;IRAM,F-38406 Saint Martin d’Hères Cedex;Academia Sinica,Institute of Astronomy and Astrophysics; 出版日期：2018-03-15 出版单位：Research in Astronomy and Astrophysics 年：2018 期：v.18 基金：funded by the Vietnam National Foundation for Science and Technology Development (NAFOSTED) (No.103.99–2016.50);; support from the World Laboratory,Rencontres du Viet Nam;; the Odon Vallet fellowships,Vietnam National Space Center;; Graduate University of Science and Technology;; the French CNRS programs PNP,PNPS and PCMI 语种：英文; 页：TTWL201803007 页数：14 CN：03 ISSN：11-5721/P 分类号：65-78

摘要

Observations by the Atacama Large Millimetre/sub-millimetre Array of the dust continuum and13 CO(3–2) millimetre 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.) by exploring detailed properties of the gas disc. A 95% confidence level upper limit of 0.24′′(34 au) is placed on the disc scale height at a distance of 1′′(140 au) from the central stars. Evidence for Keplerian rotation of the gas disc is presented,with the rotation velocity reaching~3.1 km s~(-1) at 1′′ from the central stars,and a 99% confidence level upper limit of 9% is placed on relative contribution from a possible in-fall velocity. 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.
        Observations by the Atacama Large Millimetre/sub-millimetre Array of the dust continuum and13 CO(3–2) millimetre 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.) by exploring detailed properties of the gas disc. A 95% confidence level upper limit of 0.24′′(34 au) is placed on the disc scale height at a distance of 1′′(140 au) from the central stars. Evidence for Keplerian rotation of the gas disc is presented,with the rotation velocity reaching~3.1 km s~(-1) at 1′′ from the central stars,and a 99% confidence level upper limit of 9% is placed on relative contribution from a possible in-fall velocity. 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.

引文

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    1 http://casa.nrao.edu
    2 https://www.iram.fr/IRAMFR/GILDAS
    3 http://simbad.harvard.edu/simbad/sim-fbasic