Chemical Change in the Disk Forming Region of IRAS 16293–2422 Studied with ALMA. Issue Volume 13:Issue S332(2017) (4th September 2018)

• Record Type: Journal Article
• Authors: Oya, Yoko
• Editors: Cunningham, Maria; Millar, Tom; Aikawa, Yuri
• Is Part Of: Proceedings of the International Astronomical Union. Volume 13:Issue S332(2017)
• Page Start: 73
• Page End: 80
• Publication Date: 2018-09-04
• Subjects: ALMA, -- IRAS 16293–2422, -- Molecules, -- Disk formation; Astronomy -- Congresses; Astronomy -- Periodicals; 520
• DOI: 10.1017/S1743921317007591
• Languages: English
• ISSNs: 1743-9213

Abstract

Abstract: We have analyzed rotational spectral line emission of OCS, CH3 OH, HCOOCH3, and H2 CS observed toward the low-mass Class 0 protostar IRAS 16293–2422 (Source A and B) at a sub-arcsecond resolution with ALMA. Significant chemical differentiation is found at a 50 au scale. OCS is found to trace the infalling-rotating envelope, while COM distributions are concentrated around the inner part of the envelope. The kinematic structure in Source A is explained with a ballistic model, and the protostellar mass and the radius of the centrifugal barrier are evaluated to be ~0.75 M ⊙ and ~50 au, respectively. This study has revealed that the centrifugal barrier plays a central role not only in the disk formation but also in the associated chemical evolution.