First detection of triply-deuterated methanol

By B. Parise, A. Castets, E. Herbst, E. Caux, Cecilia Ceccarelli, I. Mukhopadhyay, A. Tielens. 2003

215 citations recorded by the source corpus.

We report the first detection of triply-deuterated methanol, with 12 observed transitions, towards the low-mass protostar IRAS 16293−2422, as well as multifrequency observations of 13 CH3OH, used to derive the column density of the main isotopomer CH3OH. The derived fractionation ratio (CD3OH)/(CH3OH) averaged on a 10 �� beam is 1.4%. Together with previous CH2DOH and CHD2OH observations, the present CD3OH observations are consistent with a formation of methanol on grain surfaces, if the atomic D/H ratio is 0.1 to 0.3 in the accreting gas. Such a high atomic ratio can be reached in the framework of gas-phase chemical models including all deuterated isotopomers of H + .

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/b6e1af74b4dc47675034e94dc3d5980abf7a038f

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In Astronomy and Astrophysics

1. E. Herbst
2. R. Garrod
3. P. Caselli
4. Cecilia Ceccarelli
5. A. Tielens
6. H. Roberts
7. T. Millar
8. Y. Aikawa

In Instrumentation

1. E. Herbst
2. H. Roberts
3. A. Tielens
4. E. Jenkins
5. Cecilia Ceccarelli
6. Y. Aikawa
7. P. Caselli
8. G. Sonneborn

Citations in the corpus

• Exploring Molecular Complexity with ALMA (EMoCA): Deuterated complex organic molecules in Sagittarius B2(N2) (2015, background): “Even molecules containing several deuterium atoms have been detected (e.g., Parise et al. 2004).”
• The chemistry of multiply deuterated species in cold, dense interstellar cores (2004, methodology): “Those isotopomers of methanol without a D on the oxygen atom (CH2DOH, CHD2OH and CD3OH) are highly fractionated, whereas CH3OD is not.”
• Testing grain surface chemistry : a survey of deuterated formaldehyde and methanol in low-mass Class 0 protostars (2006, methodology): “Triply-deuterated methanol was later detected in IRAS16293 (Parise et al. 2004), and the CH3OH column density was better evaluated by analyzing13CH3OH transitions.”
• Molecular Evolution in Collapsing Prestellar Cores. III. Contraction of a Bonnor-Ebert Sphere (2004, background): “In addition, the mono-, doubly-, and triply-deuterated methanol isotopomers CH2DOH, CHD2OH and CD3OH have abundances of 0.3 ± 0.05, 0.06 ± 0.01, and 0.014 ± 0.006 relative to their normal counterpart, respectively, in the protostar IRAS 16293 (Parise et al. 2004, B. Parise personal communication).”
• What Is the Total Deuterium Abundance in the Local Galactic Disk? (2006, background): “Even triply deuterated – 13 – ammonia (van der Tak et al. 2002) and methanol (Parise et al. 2004) have even been observed in cold interstellar clouds.”
• Our astrochemical heritage (2012, background): “HDCO, D2CO and CH2DOH have been detected in pre-stellar cores ([24]; [41]), while doubly and triply deuterated methanol have been detected in the envelope of young stellar objects ([343]; [340], see §5).”
• Chemical modeling of L183 (= L134N) : an estimate of the ortho/para H2 ratio (2008, background): “However this may not be exceptional when compared to the detection of triply deuterated species, like ND3 (Lis et al. 2002, van der Tak et al. 2002) and CD3OH (Parise et al. 2004) or to the fact that most reported fractionations are line-of-sight averages and are not derived from detailed profiles.”
• Complex Molecules in the Hot Core of the Low-Mass Protostar NGC 1333 IRAS 4A (2004, background): “…fully hydrogenated molecules on the grain surfaces, has been demonstrated to occur in low mass protostars too, for example by studies of multiply deuterated molecules: formaldehyde (Ceccarelli et al. 1998, Bacmann et al. 2003), methanol (Parise et al. 2002, 2004) and sulfide (Vastel et al. 2003).”