First detection of doubly deuterated hydrogen sulfide

Abstract

This work was carried out with using the Caltech Submillimeter Observatory and presents the observational study of HDS and D2S towards a sample of Class 0 sources, and dense cores. We report the first detection of doubly deuterated hydrogen sulfide (D2S) in two dense cores and analyze the chemistry of these molecules aiming to help understand the deuteration processes in the interstellar medium. The observed values of the D2S/HDS ratio, and upper limits, require an atomic D/H ratio in the accreting gas of 0.1-1. The study presented in this Letter supports the hypothesis that formaldehyde, methanol and hydrogen sulfide are formed on the grain surfaces, during the cold pre-stellar core phase, where the CO depleted gas has large atomic D/H ratios. The high values for the D/H ratios are consistent with the predictions of a recent gas-phase chemical model that includes H3+ and its deuterated isotopomers, H2D+, D2H+ and D3+ (Roberts et al. 2003).

14 pages, 2 figures. accepted in ApJL

References in corpus (7)

• Detection of doubly-deuterated methanol in the solar-type protostar IRAS16293-2422
• Abundant H2D+ in the pre-stellar core L1544
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• The Degree of CO Depletion in Pre-stellar Cores
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• Detection of D2H+ in the Dense Interstellar Medium
• First detection of doubly deuterated hydrogen sulfide
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• The Distribution of Ortho-H_2D+(1_1,0 - 1_1,1) in L1544: Tracing the Deuteration Factory in Prestellar Cores
• The solar type protostar IRAS16293-2422: new constraints on the physical structure
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• HDO abundance in the envelope of the solar-type protostar IRAS16293-2422
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• Formation of S-bearing complex organic molecules in interstellar clouds via ice reactions with C2H2, HS, and atomic H
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• Deuterium enhancement in H3+ in prestellar cores
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• The Influence of Deuteration and Turbulent Diffusion on the Observed D/H Ratio
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• First detection of doubly deuterated methyl acetylene (CHD2CCH and CH2DCCD)
• Direct D-atom incorporation in radicals: An overlooked pathway for deuterium fractionation
• Rotational spectroscopy of oxirane-\textit{2,2}-$d_2$, $c$-CD${}_2$CH${}_2$O, and its tentative detection toward IRAS 16293$-$2422~B
• H2S ice sublimation dynamics: experimentally constrained binding energies, entrapment efficiencies, and snowlines
• Gas phase Elemental abundances in Molecular cloudS (GEMS). IX. Deuterated compounds of H2S in starless cores