Hydrogen–deuterium substitution in solid ethanol by surface reactions at low temperatures

Oba, Yasuhiro; Osaka, Kazuya; Chigai, Takeshi; Kouchi, Akira; Watanabe, Naoki

doi:10.1093/mnras/stw1714

Cited by 13 publications

(11 citation statements)

References 42 publications

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“…Thus, some organic matter could survive the inner region of the solar nebula (Walsh et al 2014). Although deuterium tends to concentrate on methyl or ethyl group more than on hydroxy groups in alcohols in molecular clouds (Nagaoka et al 2005;Oba et al 2016), deuterated molecules, such as CH 3 OD, were confirmed in ISM (Mauersberger et al 1988). Thus, both D-poor and D-rich water could be generated from hydroxy groups in organic matter, and such water could then contribute to both D-rich and D-poor hydrated minerals, as well as explain the heterogeneous D/H distribution in ordinary chondrites.…”

Section: Possible Aqueous Alteration In the "Dry" Parent Bodiesmentioning

confidence: 99%

Aqueous alteration without initial water: possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

Hirakawa

Kebukawa

Furukawa

et al. 2021

Earth Planets Space

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Early evolution of Solar System small bodies proceeded through interactions of mineral and water. Melting of water ice accreted with mineral particles to the parent body results in the formation of secondary minerals, the so-called aqueous alteration. Formation of phyllosilicates from anhydrous silicates is a typical alteration effect recorded in primitive meteorites. In addition to mineral and water, organic matter could have been also a significant component in meteorite parent bodies. However, the role of organic matter in the alteration of silicates is not well understood. We conducted a heating experiment of anhydrous silicate (olivine) with a mixture of organic compounds which simulated primordial organic matter in the Solar System. Dissolution and precipitation features were confirmed on the olivine surface after heating at 300 °C for 10 days, and proto-phyllosilicates were formed in the precipitation area. Magnesite was also detected as concomitant mineral phase. These minerals could be the evidence of aqueous alteration and carbonation of olivine induced by water generated through decomposition of the organic compounds with hydroxy groups. Our result showed that the in situ formation of hydrated silicates through a mineral–organic interaction without the initial presence of water. It further implies that formation of phyllosilicates on the olivine surface in contact with organic matter can occur in meteorite parent bodies which formed inside the H2O snow line but accreted with organic matter, initially without water. Water formed through decomposition of organic matter could be one candidate for hydrous silicate formation, for example, in ordinary chondrites from S-type asteroids inside the H2O snow line. Although the origin of water in ordinary chondrites is under debate, water generation from organic matter may also explain the D-rich water in ordinary chondrites because primordial organic matter is known to be D rich.

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Section: Possible Aqueous Alteration In the "Dry" Parent Bodiesmentioning

confidence: 99%

Aqueous alteration without initial water: possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

Hirakawa

Kebukawa

Furukawa

et al. 2021

Earth Planets Space

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show abstract

“…Thus, some organic matter could survive the inner region of the solar nebula (Walsh et al 2014). Although deuterium tends to concentrate on methyl or ethyl group more than on hydroxy groups in alcohols in molecular clouds (Nagaoka et al 2005;Oba et al 2016), deuterated molecules such as CH 3 OD were con rmed in ISM (Mauersberger et al 1988). Thus, both D-poor and D-rich water could be generated from hydroxy groups in organic matter, and such water could then contribute to both D-rich and D-poor hydrated minerals, as well as explain the heterogeneous D/H distribution in ordinary chondrites.…”

Section: Role Of Organic Mattermentioning

confidence: 99%

Aqueous alteration without initial water: Possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

Hirakawa

Kebukawa

Furukawa

et al. 2021

Preprint

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Early evolution of Solar System small bodies proceeded through interactions of mineral and water. Melting of water ice accreted with mineral particles to the parent body results in the formation of secondary minerals, the so-called aqueous alteration. Formation of phyllosilicates from anhydrous silicates is a typical alteration effect recorded in primitive meteorites. In addition to mineral and water, organic matter could have been also a significant component in meteorite parent bodies. However, the role of organic matter in the alteration of silicates is not well understood. We conducted a heating experiment of anhydrous silicate (olivine) with a mixture of organic compounds which simulated primordial organic matter in the Solar System. Dissolution and precipitation features were confirmed on the olivine surface after heating at 300 °C for 10 days, and proto-phyllosilicates were formed in the precipitation area. Magnesite was also detected as concomitant mineral phase. These minerals could be the evidence of aqueous alteration and carbonation of olivine induced by water generated through decomposition of the organic compounds with hydroxy groups. Our result showed that the in-situ formation of hydrated silicates through a mineral-organic interaction without the initial presence of water. It further implies that formation of phyllosilicates on the olivine surface in contact with organic matter can occur in meteorite parent bodies which formed inside the H2O snow line but accreted with organic matter, initially without water. Water formed through decomposition of organic matter could be one candidate for hydrous silicate formation, for example in ordinary chondrites from S-type asteroids inside the H2O snow line. Although the origin of water in ordinary chondrites is under debate, water generation from organic matter may also explain the D-rich water in ordinary chondrites because primordial organic matter is known to be D-rich.

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“…Finally, we ran model Mex which includes some simple enrichment mechanism such as the H-D exchange (substitution) reactions (listed in Table 4) that have been proven, experimentally, to be important in enhancing the deuteration of interstellar species (e.g. Nagaoka et al 2005;Hidaka et al 2009;Oba et al 2016). The lack of the inclusion of these reactions in chemical models led to a deficiency in the relative abundances of HCOOCH2D and HCOOCHD2 with respect to MF as claimed by Manigand et al (2019).…”

Section: The Grid Of Modelsmentioning

confidence: 99%

On the formation of deuterated methyl formate in hot corinos

Awad

Coutens

Viti

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Methyl formate, HCOOCH3, and many of its isotopologues have been detected in astrophysical regions with considerable abundances. However, the recipe for the formation of this molecule and its isotopologues is not yet known. In this work, we attempt to investigate, theoretically, the successful recipe for the formation of interstellar HCOOCH3 and its deuterated isotopologues. We used the gas-grain chemical model, UCLCHEM, to examine the possible routes of formation of methyl formate on grain surfaces and in the gas-phase in low-mass star-forming regions. Our models show that radical-radical association on grains are necessary to explain the observed abundance of DCOOCH3 in the protostar IRAS 16293–2422. H-D substitution reactions on grains significantly enhance the abundances of HCOOCHD2, DCOOCHD2, and HCOOCD3. The observed abundance of HCOOCHD2 in IRAS 16293–2422 can only be reproduced if H-D substitution reactions are taken into account. However, HCOOCH2D remain underestimated in all of our models. The deuteration of methyl formate appears to be more complex than initially thought. Additional studies, both experimentally and theoretically, are needed for a better understanding of the interstellar formation of these species.

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Hydrogen–deuterium substitution in solid ethanol by surface reactions at low temperatures

Cited by 13 publications

References 42 publications

Aqueous alteration without initial water: possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

Aqueous alteration without initial water: possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

Aqueous alteration without initial water: Possibility of organic-induced hydration of anhydrous silicates in meteorite parent bodies

On the formation of deuterated methyl formate in hot corinos

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