SIMBAD references

2021MNRAS.500.4901D - Mon. Not. R. Astron. Soc., 500, 4901-4920 (2021/February-1)

Prestellar grain-surface origins of deuterated methanol in comet 67P/Churyumov-Gerasimenko.

DROZDOVSKAYA M.N., SCHROEDER I I.R.H.G., RUBIN M., ALTWEGG K., VAN DISHOECK E.F., KULTERER B.M., DE KEYSER J., FUSELIER S.A. and COMBI M.

Abstract (from CDS):

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 (CH3OD and CH2DOH combined) and D2-methanol (CH2DOD and CHD2OH 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 CH2DOH forms from CO hydrogenation to CH3OH and subsequent H-D substitution reactions in CH3-R. CHD2OH is likely produced from deuterated formaldehyde. Meanwhile, CH3OD and CH2DOD 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 D2O 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 (10-20 K) prestellar core that birthed our Solar system. Cometary volatiles individually reflect the evolutionary phases of star formation from cloud to core to protostar.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): astrochemistry - comets: general - comets: individual: 67P/Churyumov-Gerasimenko - ISM: molecules

Status at CDS : Examining the need for a new acronym. // Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 42

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2021.12.03-21:31:04

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