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Unified Picture of Chemical Differentiation in Disk-Forming Regions of Low-Mass Protostellar Sources

Published online by Cambridge University Press:  13 January 2020

Yoko Oya Open the ORCID record for Yoko Oya [Opens in a new window]
Yoko Oya*
Affiliation:
Department of Physics, The University of Tokyo, 7-3-1, Hongo, Bunkyo-ku, Tokyo, Japan email: oya@taurus.phys.s.u-tokyo.ac.jp
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Abstract

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Young low-mass protostellar sources are known to show significant chemical diversity in their envelopes at a few 1000s au scale; two distinct cases are hot corino chemistry and warm carbon-chain chemistry (WCCC). It is of great interest how the chemical diversity is inherited to chemistry of disk-forming regions. With the recent ALMA observations, we found that the chemical diversity in envelopes is indeed delivered into the disk-forming regions at a 100 au scale. Moreover, the chemical composition changes drastically from envelopes to disks. We also found sources with the hybrid chemical characteristics; both hot corino chemistry and WCCC occur in spatially separated parts of a single source. This hybrid case may be a common occurrence, while hot corinos and WCCC sources are regarded as distinct cases. This unified view of chemistry in disk-forming regions will be an important clue to tracing the chemical evolution from protostellar cores to protoplanetary disks.

Keywords

astrochemistryALMAISM: IRAS 16293–2422L1527B335L483
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S345: Origins: From the Protosun to the First Steps of Life , August 2018 , pp. 111 - 114
Copyright
© International Astronomical Union 2020 

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