Deuterated methanol in comet 67P/C-G Virtual Observatory Resource

Authors
  1. Drozdovskaya M.N.
  2. Schroeder I I.R.H.G.
  3. Rubin M.
  4. Altwegg K.,van Dishoeck E.F.
  5. Kulterer B.M.
  6. De Keyser J.
  7. Fuselier S.A.
  8. Combi M.
  9. Published by
    CDS
Abstract

Deuterated methanol is one of the most robust windows astrochemists have on the individual chemical reactions forming deuterium-bearing molecules and the physicochemical history of the regions where they reside. The first-time detection of mono- and di-deuterated methanol in a cometary coma is presented for comet 67P/Churyumov-Gerasimenko using Rosetta-ROSINA data. D-methanol (CH_3_OD and CH_2_DOH combined) and D_2_-methanol (CH_2_DOD and CHD_2_OH combined) have an abundance of 5.5+/0.46 and 0.00069+/-0.00014 per cent relative to normal methanol. The data span a methanol deuteration fraction (D/H ratio) in the 0.71-6.6 per cent range, accounting for statistical corrections for the location of D in the molecule and including statistical error propagation in the ROSINA measurements. It is argued that cometary CH_2_DOH forms from CO hydrogenation to CH_3_OH and subsequent H-D substitution reactions in CH_3_-R. CHD_2_OH is likely produced from deuterated formaldehyde. Meanwhile, CH_3_OD and CH_2_DOD could form via H-D exchange reactions in OH-R in the presence of deuterated water ice. Methanol formation and deuteration is argued to occur at the same epoch as D_2_O formation from HDO, with formation of mono-deuterated water, hydrogen sulphide, and ammonia occurring prior to that. The cometary D-methanol/methanol ratio is demonstrated to agree most closely with that in prestellar cores and low-mass protostellar regions. The results suggest that cometary methanol stems from the innate cold (10-20K) prestellar core that birthed our Solar system. Cometary volatiles individually reflect the evolutionary phases of star formation from cloud to core to protostar.

Keywords
  1. comets
  2. molecular-physics
  3. interstellar-medium
  4. star-forming-regions
Bibliographic source Bibcode
2021MNRAS.500.4901D
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/500/4901
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/500/4901

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https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/500/4901/tabled1?
https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/500/4901/tabled1?
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https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/500/4901/tabled2?
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History

2023-11-14T08:04:17Z
Resource record created
2023-11-14T08:04:17Z
Created
2023-11-15T09:52:11Z
Updated

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