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• W4312448003 abstract "Rotational spectral line emission of OCS, CH $$_3$$ OH, HCOOCH $$_3$$ , and H $$_2$$ CS were observed toward the low-mass Class 0 protostellar source IRAS 16293−2422 Source A at a sub-arcsecond resolution ( $$sim $$ 0. $$^{prime prime }$$ 6 $$times $$ 0. $$^{prime prime }$$ 5) with ALMA. Significant chemical differentiation is found at a 50 au scale. The OCS ( $$J=19-18$$ ) line is found to well trace the infalling-rotating envelope in this source. Meanwhile, the CH $$_3$$ OH and HCOOCH $$_3$$ distributions are found to be concentrated around the inner part of the envelope. Applying a simple ballistic model of the infalling-rotating envelope to the OCS data, the protostellar mass and the radius of the centrifugal barrier are evaluated to be from 0.5 to 1.0 $$M_odot $$ and from 40 to 60 au, respectively, assuming the inclination angle of 60 $$^{circ }$$ for the disk/envelope system (0 $$^{circ }$$ for a face-on configuration). While the evaluation of the protostellar mass suffers from the assumption of the inclination angle, the radius of the centrifugal barrier does not. This is the first indication of the centrifugal barrier of the infalling-rotating envelope in a hot corino source. CH $$_3$$ OH and HCOOCH $$_3$$ may be liberated from ice mantles due to weak accretion shocks around the centrifugal barrier and/or due to protostellar heating. As well as the envelope component, the H $$_2$$ CS emission likely comes from the disk component inside its centrifugal barrier. Thus, the centrifugal barrier seems to play an essential role not only in the formation of a rotationally-supported disk but also in the chemical evolution from an envelope to a protostellar/protoplanetary disk." @default.
• W4312448003 created "2023-01-04" @default.
• W4312448003 creator A5081071590 @default.
• W4312448003 date "2022-01-01" @default.
• W4312448003 modified "2023-09-30" @default.
• W4312448003 title "IRAS 16293–2422 Source A" @default.
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• W4312448003 doi "https://doi.org/10.1007/978-981-19-1708-0_6" @default.
• W4312448003 hasPublicationYear "2022" @default.
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