Vertical structure of the transition zone from infalling rotating envelope to disc in the Class 0 protostar, IRAS 04368+2557 - IRSTEA - Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (<b>anciennement Cemagref</b>) Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society: Letters Année : 2017

Vertical structure of the transition zone from infalling rotating envelope to disc in the Class 0 protostar, IRAS 04368+2557

Nami Sakai
Yoko Oya
Aya E. Higuchi
  • Fonction : Auteur
Yuri Aikawa
Tomoyuki Hanawa
Ana López-Sepulcre
Yoshimasa Watanabe
Takeshi Sakai
Tomoya Hirota
Satoshi Yamamoto
  • Fonction : Auteur

Résumé

We have resolved for the first time the radial and vertical structures of the almost edge-on envelope/disc system of the low-mass Class 0 protostar L1527. For that, we have used Atacama Large Millimetre/submillimetre Array (ALMA) observations with a spatial resolution of 0.25 × 0.13 arcsec2 and 0.37 × 0.23 arcsec2 at 0.8 and 1.2 mm, respectively. The L1527 dust continuum emission has a deconvolved size of 78 × 21 au2, and shows a flared disc-like structure. A thin infalling-rotating envelope is seen in the CCH emission outward of about 150 au, and its thickness is increased by a factor of 2 inward of it. This radius lies between the centrifugal radius (200 au) and the centrifugal barrier of the infalling-rotating envelope (100 au). The gas stagnates in front of the centrifugal barrier and moves towards vertical directions. SO emission is concentrated around and inside the centrifugal barrier. The rotation speed of the SO emitting gas is found to be decelerated around the centrifugal barrier. A part of the angular momentum could be extracted by the gas that moves away from the mid-plane around the centrifugal barrier. If this is the case, the centrifugal barrier would be related to the launching mechanism of low-velocity outflows, such as disc winds.
Fichier principal
Vignette du fichier
slx002.pdf (3.2 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

insu-03676994 , version 1 (24-05-2022)

Licence

Paternité

Identifiants

Citer

Nami Sakai, Yoko Oya, Aya E. Higuchi, Yuri Aikawa, Tomoyuki Hanawa, et al.. Vertical structure of the transition zone from infalling rotating envelope to disc in the Class 0 protostar, IRAS 04368+2557. Monthly Notices of the Royal Astronomical Society: Letters, 2017, 467, pp.L76-L80. ⟨10.1093/mnrasl/slx002⟩. ⟨insu-03676994⟩
24 Consultations
7 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More