Laboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH)
We report an extensive rotational spectroscopic analysis of singly deuterated methyl mercaptan (CH _2 DSH) using both millimeter and far-infrared synchrotron spectra to achieve a global torsional analysis of the three lowest torsional substates ( e _0 , e _1 , and o _1 ) of this nonrigid species. A...
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2025-01-01
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| Series: | The Astrophysical Journal Letters |
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| Online Access: | https://doi.org/10.3847/2041-8213/adacea |
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| author | Hayley A. Bunn Silvia Spezzano Laurent H. Coudert Jean-Claude Guillemin Yuxin Lin Christian P. Endres Brant Billinghurst Olivier Pirali Jes Jørgensen Valerio Lattanzi Paola Caselli |
| author_facet | Hayley A. Bunn Silvia Spezzano Laurent H. Coudert Jean-Claude Guillemin Yuxin Lin Christian P. Endres Brant Billinghurst Olivier Pirali Jes Jørgensen Valerio Lattanzi Paola Caselli |
| author_sort | Hayley A. Bunn |
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| description | We report an extensive rotational spectroscopic analysis of singly deuterated methyl mercaptan (CH _2 DSH) using both millimeter and far-infrared synchrotron spectra to achieve a global torsional analysis of the three lowest torsional substates ( e _0 , e _1 , and o _1 ) of this nonrigid species. A fit including 3419 millimeter-wave transitions along with 43 infrared torsional subband centers was performed with rms deviations of 0.233 MHz and 0.270 cm ^−1 , respectively, resulting in 68 fit parameters. A spectroscopic catalog built from this analysis for a temperature of 125 K has led to the first interstellar detection of CH _2 DSH toward the solar-like protostar IRAS 16293-2422 B. We report the identification of 46 transitions, including eight relatively unblended lines, resulting in a derived column density of (3.0 ± 0.3) × 10 ^14 cm ^−2 . The column density ratio for HDCS/CH _2 DSH compared to HDCO/CH _2 DOH suggests a difference in the interstellar chemistry between the sulfur and oxygen complex organics, in particular a different link between H _2 CO and CH _3 OH and between H _2 CS and CH _3 SH. This is the first interstellar detection of a deuterated sulfur-bearing complex organic molecule and therefore an important step toward understanding the chemical origin of sulfur-based prebiotics. |
| format | Article |
| id | doaj-art-f372fb8d5ebb4744b642b63a4bf21293 |
| institution | Kabale University |
| issn | 2041-8205 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal Letters |
| spelling | doaj-art-f372fb8d5ebb4744b642b63a4bf212932025-02-11T10:05:26ZengIOP PublishingThe Astrophysical Journal Letters2041-82052025-01-019801L1310.3847/2041-8213/adaceaLaboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH)Hayley A. Bunn0https://orcid.org/0000-0002-7783-3049Silvia Spezzano1https://orcid.org/0000-0002-6787-5245Laurent H. Coudert2https://orcid.org/0000-0003-0498-6957Jean-Claude Guillemin3https://orcid.org/0000-0002-2929-057XYuxin Lin4https://orcid.org/0000-0001-9299-5479Christian P. Endres5Brant Billinghurst6Olivier Pirali7https://orcid.org/0000-0002-4332-1440Jes Jørgensen8Valerio Lattanzi9https://orcid.org/0000-0001-9819-1658Paola Caselli10https://orcid.org/0000-0003-1481-7911Center for Astrochemical Studies , Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, GermanyCenter for Astrochemical Studies , Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, GermanyUniversité Paris-Saclay , CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, FranceUniv Rennes , Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR—UMR6226, F-35000 Rennes, FranceCenter for Astrochemical Studies , Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, GermanyCenter for Astrochemical Studies , Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, GermanyCanadian Light Source. Inc., University of Saskatchewan , Saskatoon, Saskatchewan S7N 2 V3, CanadaUniversité Paris-Saclay , CNRS, Institut des Sciences Moléculaires d’Orsay, 91405 Orsay, France; AILES beamline Synchrotron Soleil , L’Orme des Merisiers, 91190 Saint-Aubin, FranceNiels Bohr Institute, University of Copenhagen , Øster Voldgade 5–7, 1350 Copenhagen K., DenmarkCenter for Astrochemical Studies , Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, GermanyCenter for Astrochemical Studies , Max-Planck-Institut für extraterrestrische Physik, Gießenbachstraße 1, 85748 Garching, GermanyWe report an extensive rotational spectroscopic analysis of singly deuterated methyl mercaptan (CH _2 DSH) using both millimeter and far-infrared synchrotron spectra to achieve a global torsional analysis of the three lowest torsional substates ( e _0 , e _1 , and o _1 ) of this nonrigid species. A fit including 3419 millimeter-wave transitions along with 43 infrared torsional subband centers was performed with rms deviations of 0.233 MHz and 0.270 cm ^−1 , respectively, resulting in 68 fit parameters. A spectroscopic catalog built from this analysis for a temperature of 125 K has led to the first interstellar detection of CH _2 DSH toward the solar-like protostar IRAS 16293-2422 B. We report the identification of 46 transitions, including eight relatively unblended lines, resulting in a derived column density of (3.0 ± 0.3) × 10 ^14 cm ^−2 . The column density ratio for HDCS/CH _2 DSH compared to HDCO/CH _2 DOH suggests a difference in the interstellar chemistry between the sulfur and oxygen complex organics, in particular a different link between H _2 CO and CH _3 OH and between H _2 CS and CH _3 SH. This is the first interstellar detection of a deuterated sulfur-bearing complex organic molecule and therefore an important step toward understanding the chemical origin of sulfur-based prebiotics.https://doi.org/10.3847/2041-8213/adaceaAstrochemistryLaboratory astrophysicsMolecular spectroscopyInterstellar moleculesInterstellar abundances |
| spellingShingle | Hayley A. Bunn Silvia Spezzano Laurent H. Coudert Jean-Claude Guillemin Yuxin Lin Christian P. Endres Brant Billinghurst Olivier Pirali Jes Jørgensen Valerio Lattanzi Paola Caselli Laboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH) The Astrophysical Journal Letters Astrochemistry Laboratory astrophysics Molecular spectroscopy Interstellar molecules Interstellar abundances |
| title | Laboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH) |
| title_full | Laboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH) |
| title_fullStr | Laboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH) |
| title_full_unstemmed | Laboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH) |
| title_short | Laboratory Rotational Spectroscopy Leads to the First Interstellar Detection of Singly Deuterated Methyl Mercaptan (CH2DSH) |
| title_sort | laboratory rotational spectroscopy leads to the first interstellar detection of singly deuterated methyl mercaptan ch2dsh |
| topic | Astrochemistry Laboratory astrophysics Molecular spectroscopy Interstellar molecules Interstellar abundances |
| url | https://doi.org/10.3847/2041-8213/adacea |
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