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• W3100811005 endingPage "1020" @default.
• W3100811005 startingPage "1006" @default.
• W3100811005 abstract "The formation and evolution of the circumstellar disk in unmagnetized molecular clouds is investigated using three-dimensional hydrodynamic simulations from the prestellar core until the end of the main accretion phase. In collapsing cloud cores, the first (adiabatic) core with a size of ≳3 AU forms prior to the formation of the protostar. At its formation, the first core has a thick disk-like structure and is mainly supported by the thermal pressure. After the protostar formation, it decreases the thickness gradually and becomes supported by the centrifugal force. We found that the first core is a precursor of the circumstellar disk with a size of >3 AU. This means that unmagnetized protoplanetary disk smaller than <3 AU does not exist. Reflecting the thermodynamics of the collapsing gas, at the protostar formation epoch, the first core (or the circumstellar disk) has a mass of ∼0.005–0.1 M☉, while the protostar has a mass of ∼10−3 M☉. Thus, just after the protostar formation, the circumstellar disk is about 10–100 times more massive than the protostar. In the main accretion phase that lasts for ∼105 yr, the circumstellar disk mass initially tends to dominate the protostellar mass. Such a massive disk is unstable to gravitational instability and tends to show fragmentation. Our calculations indicate that the low-mass companions may form in the circumstellar disk in the main accretion phase. In addition, the mass accretion rate onto the protostar shows a strong time variability that is caused by the torque from the low-mass companions and/or the spiral arms in the circumstellar disk. Such variability provides an important signature for detecting the substellar mass companion in the circumstellar disk around very young protostars." @default.
• W3100811005 created "2020-11-23" @default.
• W3100811005 creator A5027187535 @default.
• W3100811005 creator A5051175770 @default.
• W3100811005 creator A5062038963 @default.
• W3100811005 date "2010-11-10" @default.
• W3100811005 modified "2023-10-16" @default.
• W3100811005 title "FORMATION PROCESS OF THE CIRCUMSTELLAR DISK: LONG-TERM SIMULATIONS IN THE MAIN ACCRETION PHASE OF STAR FORMATION" @default.
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• W3100811005 doi "https://doi.org/10.1088/0004-637x/724/2/1006" @default.
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