PHUONG, N. T.; DIEP, P. N.; DUTREY, Anne; CHAPILLON, E.; DARRIULAT, P.; GUILLOTEAU, S.; HOAI, D. T.; NHUNG, P. T.; TANG, Y.-W.; THAO, N. T.; TUAN-ANH, P.

doi:10.1088/1674-4527/18/3/31

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

PHUONG, N. T.
AMOR 2018

DIEP, P. N.

DUTREY, Anne
AMOR 2018

Langue

Article de revue

Ce document a été publié dans

Research in Astronomy and Astrophysics. 2018, vol. 18, n° 3, p. id. 031

IOP Publishing

Résumé en anglais

Observations 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.< Réduire

Mots clés en anglais

Astrophysics - Solar and Stellar Astrophysics

Astrophysics - Astrophysics of Galaxies

Métadonnées

Licence d’utilisation du document

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

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés en anglais

DOI

Origine

Unités de recherche