Deuterated methanol toward NGC 7538-IRS1

Ospina-Zamudio, J.; Favre, Cécile; Kounkel, Marina; Xu, Li‐Hong; Neill, Justin L.; Leflóch, B.; Fauré, Alexandre; Bergin, Edwin A.; Fedele, D.; Hartmann, L.

doi:10.1051/0004-6361/201834948

Cited by 8 publications

(6 citation statements)

References 45 publications

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“…According to the grain chemistry models (e.g., Charnley et al 1997;Osamura et al 2004), the statistical value of the CH 2 DOH/ CH 3 OD ratio should be 3. However, the observed ratios in starforming regions such as hot corinos differ from this statistical value (e.g., Ospina-Zamudio et al 2019;Parise et al 2004;Drozdovskaya et al 2021). Nagaoka et al (2005Nagaoka et al ( , 2007 proposed that substitution reactions on the methyl group by a deuterium atom are more efficient and can result in the higher D/H ratio observed for CH 2 DOH.…”

Section: Introductionmentioning

confidence: 92%

Laboratory Measurement of Millimeter-wave Transitions of ¹³CH₂DOH for Astronomical Use

Ohno

Oyama

Tamanai

et al. 2022

ApJ

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Methanol (CH3OH) is an abundant interstellar species and is known to be an important precursor of various interstellar complex organic molecules. Among the methanol isotopologues, CH2DOH is one of the most abundant isotopologues and it is often used to study the deuterium fractionation of CH3OH in interstellar medium. However, the emission lines of CH2DOH can sometimes be optically thick, making the derivation of its abundance unreliable. Therefore, observations of its presumably optically thin 13C substituted species, 13CH2DOH, are essential to overcome this issue. In this study, the rotational transitions of 13CH2DOH have been measured in the millimeter-wave region from 216 GHz to 264 GHz with an emission-type millimeter- and submillimeter-wave spectrometer by using a deuterium and 13C enriched sample. The frequency accuracy of measured 13CH2DOH is less than a few kHz, and the relative line intensity error is less than 10% in most of the frequency range by taking advantage of the wide simultaneous frequency-coverage of the emission-type spectrometer. These results offer a good opportunity to detect 13CH2DOH in space, which will allow us to study the deuterium fractionation of CH3OH in various sources through accurate determination of the CH2DOH abundance.

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Section: Introductionmentioning

confidence: 92%

Laboratory Measurement of Millimeter-wave Transitions of ¹³CH₂DOH for Astronomical Use

Ohno

Oyama

Tamanai

et al. 2022

ApJ

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“…These are discussed one-by-one in detail in the following subsections. , 2004Fontani et al 2015;Bianchi et al 2017a;Ospina-Zamudio et al 2019). These observations are prone to beam dilution.…”

Section: A P P E N D I X B : C Av E At S O F I N T E R S T E L L a R O B S E Rvat I O N Smentioning

confidence: 99%

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

Drozdovskaya

Schroeder

Rubin

et al. 2020

Monthly Notices of the Royal Astronomical Society

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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 sulfide, 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.

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“…and their deuterated species (NH 2 D, CH 2 DOH, CH 3 OD).The main conclusion of this work is that N 2 D + /N 2 H + is the only ratio which shows a statistically significant decrease from HMSCs to HMPOs. Recently, Ospina-Zamudio et al (2019) investigated the deuteration of methanol towards the high-mass star-forming region NGC7538-IRS1. Their study showed that the fractionation degree of deuterated methanol is low in this source ∼1-3×10 −4 , and a CH 2 DOH/CH 3 OD relative abundance of 3.2±1.5.…”

Section: D-fractionation Towards Massive Star-forming Regionsmentioning

confidence: 99%

Isotopic fractionation study towards massive star-forming regions across the Galaxy

Colzi

2021

Premio Tesi Di Dottorato

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One of the most important tools to investigate the chemical history of our Galaxy and our own Solar System is to measure the isotopic fractionation of chemical elements. In the present study new astronomical observations devoted to the study of hydrogen and nitrogen fractionation (D/H and 14N/15N ratios) of molecules, towards massive star-forming regions in different evolutionary phases, have been presented. Moreover, a new detailed theoretical study of carbon fractionation, 12C/13C ratios, has been done. One of the main results was the confirmation that the 14N/15N ratio increases with the galactocentric distance, as predicted by stellar nucleosynthesis Galactic chemical evolution models. This work gives new important inputs on the understanding of local chemical processes that favor the production of molecules with different isotopes in star-forming regions.

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Deuterated methanol toward NGC 7538-IRS1

Cited by 8 publications

References 45 publications

Laboratory Measurement of Millimeter-wave Transitions of ¹³CH₂DOH for Astronomical Use

Laboratory Measurement of Millimeter-wave Transitions of ¹³CH₂DOH for Astronomical Use

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

Isotopic fractionation study towards massive star-forming regions across the Galaxy

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Deuterated methanol toward NGC 7538-IRS1

Cited by 8 publications

References 45 publications

Laboratory Measurement of Millimeter-wave Transitions of 13CH2DOH for Astronomical Use

Laboratory Measurement of Millimeter-wave Transitions of 13CH2DOH for Astronomical Use

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

Isotopic fractionation study towards massive star-forming regions across the Galaxy

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Laboratory Measurement of Millimeter-wave Transitions of ¹³CH₂DOH for Astronomical Use

Laboratory Measurement of Millimeter-wave Transitions of ¹³CH₂DOH for Astronomical Use