2013年
Evolution of protostellar outflow around low-mass protostar
Monthly Notices of the Royal Astronomical Society
- ,
- 巻
- 431
- 号
- 2
- 開始ページ
- 1719
- 終了ページ
- 1744
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1093/mnras/stt291
The evolution of protostellar outflow is investigated with resistive magneto-hydrodynamic nested-grid simulations that cover a wide range of spatial scales (∼1 au-1 pc). We follow cloud evolution from the pre-stellar core stage until the infalling envelope dissipates long after the protostar formation. We also calculate protostellar evolution to derive protostellar luminosity with time-dependent mass accretion through a circumstellar disc. The protostellar outflow is driven by the first core prior to protostar formation and is directly driven by the circumstellar disc after protostar formation. The opening angle of the outflow is large in the Class 0 stage. A large fraction of the cloud mass is ejected in this stage, which reduces the star formation efficiency to ∼50 per cent. After the outflow breaks out from the natal cloud, the outflow collimation is gradually improved in the Class I stage. The head of the outflow travels more than ∼10. 5 au in ∼10. 5 yr. The outflow momentum, energy and mass derived in our calculations agree well with observations. In addition, our simulations show the same correlations among outflow momentum flux, protostellar luminosity and envelope mass as those in observations. These correlations differ between Class 0 and I stages, which are explained by different evolutionary stages of the outflow
in the Class 0 stage, the outflow is powered by the accreting mass and acquires its momentum from the infalling envelope
in the Class I stage, the outflow enters the momentum-driven snow-plough phase. Our results suggest that protostellar outflow should determine the final stellar mass and significantly affect the early evolution of low-mass protostars. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
in the Class 0 stage, the outflow is powered by the accreting mass and acquires its momentum from the infalling envelope
in the Class I stage, the outflow enters the momentum-driven snow-plough phase. Our results suggest that protostellar outflow should determine the final stellar mass and significantly affect the early evolution of low-mass protostars. © 2013 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society.
- ID情報
-
- DOI : 10.1093/mnras/stt291
- ISSN : 0035-8711
- ISSN : 1365-2966
- ORCIDのPut Code : 48854076
- SCOPUS ID : 84876835142
- BibTex Code : 2013MNRAS.431.1719M