Spectroscopic Characterization and Detection of Ethyl Mercaptan in Orion

Kolesníková, Lucie; Tercero, B.; Cernicharo, J.; Alonso, José L.; Daly, Adam M.; Gordon, Brittany P.; Shipman, Steven T.

doi:10.1088/2041-8205/784/1/l7

Cited by 107 publications

(141 citation statements)

References 33 publications

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“…Altogether, we reduced 3000 of unidentified lines through these studies. At this point, we were ready to search for new molecular species, detecting methyl acetate and gauche-ethyl formate ) and gauche-ethyl mercaptan (Kolesniková et al 2014) for the first time in space, and providing the tentative detection of phenol (Kolesniková et al 2013). These new species together with the work of López et al (in prep., about vibrationally excited CH 3 OCOH and CH 3 COOH) account for 1000 lines.…”

Section: Resultsmentioning

confidence: 97%

“…Up to date, we performed a deep analysis of the data (15 papers have been already published): identifying more than 15 000 spectral features (Tercero et al 2010;, detecting new molecules in space (CH 3 COOCH 3 and g-CH 3 CH 2 OCOH in Tercero et al 2013; NH 3 D + in Cernicharo et al 2013; CH 3 CH 2 SH in Kolesniková et al 2014; also tentative detections of c-C 6 H 5 O in Kolesniková et al 2013 and upper limit calculations for the column density of non detected molecules −cis-CH 2 CHCH 2 CN and cis-CH 2 CHCH 2 NC− in Haykal et al 2013b) and several new isotopologues and Table 2. (1…”

Section: Observations Data Reduction and Overall Resultsmentioning

confidence: 99%

“…In addition and to analyze some of these results, we modelese the following molecules: CH 3 SH, CH 3 OH, CH 3 CH 2 OH in Kolesniková et al (2014), HCOOCH 3 in Margulès et al (2010), and NH 2 CHO in Motiyenko et al (2012). Nevertheless, the study of this line survey is still open and several groups are working simultaneously based on the scope of these observations 4 .…”

Section: Observations Data Reduction and Overall Resultsmentioning

confidence: 99%

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THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

Haykal¹,

Carvajal²,

Tercero³

et al. 2014

A&A

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Context. An astronomical survey of interstellar molecular clouds needs a previous analysis of the spectra in the microwave and sub-mm energy range of organic molecules to be able to identify them. We obtained very accurate spectroscopic constants in a comprehensive laboratory analysis of rotational spectra. These constants can be used to predict the transitions frequencies very precisely that were not measured in the laboratory. Aims. We present the experimental study and its theoretical analysis for two 13 C-methyl formate isotopologues to detect these two isotopologues for the first time in their excited torsional states, which lie at 130 cm −1 (200 K) in Orion-KL. Methods. New spectra of HCOO 13 CH 3 ( 13 C 2 ) methyl formate were recorded with the mm-and submm-wave spectrometer in Lille from 50 to 940 GHz. A global fit for v t = 0 and 1 was accomplished with the BELGI program to reproduce the experimental spectra with greater accuracy. Results. We analysed 5728 and 2881 new lines for v t = 0 and 1 for HCOO 13 CH 3 . These new lines were globally fitted with 846 previously published lines for v t = 0. In consequence, 52 parameters of the RAM Hamiltonian were accurately determined and the value of the barrier height (V 3 = 369.93168(395) cm −1 ) was improved. We report the detection of the first excited torsional states (v t = 1) in Orion-KL for the 13 C 2 and 13 C 1 methyl formate based on the present analysis and previously published data. We provide column densities, isotopic abundances, and vibrational temperatures for these species. Conclusions. Following this work, accurate prediction can be provided. This permits detecting 135 features of the first excited torsional states of 13 C-methyl formate isotopologues in Orion-KL in the 80−280 GHz frequency range, without missing lines.

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Section: Resultsmentioning

confidence: 97%

Section: Observations Data Reduction and Overall Resultsmentioning

confidence: 99%

Section: Observations Data Reduction and Overall Resultsmentioning

confidence: 99%

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THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

Haykal¹,

Carvajal²,

Tercero³

et al. 2014

A&A

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“…CS was the first sulphur bearing molecule detected in the interstellar medium (Penzias et al 1971 Kolesniková et al (2014) in Orion. Previously methyl meracaptan CH3SH was first detected in SgrB2 (Linke et al 1979) followed by observations in the organic-rich hot core G327.3-0.6 (Gibb et al 2000b), and in Orion (Kolesniková et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Detection of CH₃SH in protostar IRAS 16293-2422

Majumdar¹,

Gratier²,

Vidal³

et al. 2016

Mon. Not. R. Astron. Soc.

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The nature of the main sulphur reservoir in star forming regions is a long standing mystery. The observed abundance of sulphur-bearing species in dense clouds is only about 0.1 per cent of the same quantity in diffuse clouds. Therefore, the main sulphur species in star forming regions of the interstellar medium are still unknown. IRAS 16293-2422 is one of the regions where production of S-bearing species is favourable due to its conditions which allows the evaporation of ice mantles. We carried out observations in the 3 mm band towards the solar type protostar IRAS 16293-2422 with the IRAM 30m telescope. We observed a single frequency setup with the EMIR heterodyne 3 mm receiver with an Lower Inner (LI) tuning frequency of 89.98 GHz. Several lines of the complex sulphur species CH 3 SH were detected. Observed abundances are compared with simulations using the NAUTILUS gas-grain chemical model. Modelling results suggest that CH 3 SH has the constant abundance of 4 × 10 −9 (compared to H 2 ) for radii lower than 200 AU and is mostly formed on the surfaces. Detection of CH 3 SH indicates that there may be several new families of S-bearing molecules (which could form starting from CH 3 SH) which have not been detected or looked for yet.

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“…About 20 sulfur-containing molecules have been identified in space so far, but only one of them, methyl mercaptan (CH 3 SH), exhibits observable internal rotation splittings (called A-E splittings) because of the internal rotation of the methyl group (Linke et al 1979;Müller et al 2016). Ethyl mercaptan (CH 3 CH 2 SH) has been recently detected in the Orion Cloud (Kolesniková et al 2014), but no A-E splittings could be observed owing to the high barrier to internal rotation.…”

Section: Introductionmentioning

confidence: 99%

Laboratory microwave, millimeter wave and far-infrared spectra of dimethyl sulfide

Jabri

Van

Nguyen

et al. 2016

A&A

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Context. Dimethyl sulfide, CH 3 SCH 3 (DMS), is a nonrigid, sulfur-containing molecule whose astronomical detection is considered to be possible in the interstellar medium. Very accurate spectroscopic constants were obtained by a laboratory analysis of rotational microwave and millimeter wave spectra, as well as rotation-torsional far-infrared (FIR) spectra, which can be used to predict transition frequencies for a detection in interstellar sources. Aims. This work aims at the experimental study and theoretical analysis of the ground torsional state and ground torsional band ν 15 of DMS in a large spectral range for astrophysical use. Methods. The microwave spectrum was measured in the frequency range 2−40 GHz using two Molecular Beam Fourier Transform MicroWave (MB-FTMW) spectrometers in Aachen, Germany. The millimeter spectrum was recorded in the 50−110 GHz range. The FIR spectrum was measured for the first time at high resolution using the FT spectrometer and the newly built cryogenic cell at the French synchrotron SOLEIL. Results. DMS has two equivalent methyl internal rotors with a barrier height of about 730 cm −1 . We performed a fit, using the XIAM and BELGI-C s -2Tops codes, that contained the new measurements and previous transitions reported in the literature for the ground torsional state ν t = 0 (including the four torsional species AA, AE, EA and EE) and for the ground torsional band ν 15 = 1 ← 0 (including only the AA species). In the microwave region, we analyzed 584 transitions with J ≤ 30 of the ground torsional state ν t = 0 and 18 transitions with J ≤ 5 of the first excited torsional state ν t = 1. In the FIR range, 578 transitions belonging to the torsional band ν 15 = 1 ← 0 with J ≤ 27 were assigned. Totally, 1180 transitions were included in a global fit with 21 accurately determined parameters. These parameters can be used to produce a reliable line-list for an astrophysical detection of DMS.

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Spectroscopic Characterization and Detection of Ethyl Mercaptan in Orion

Cited by 107 publications

References 33 publications

THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

Detection of CH₃SH in protostar IRAS 16293-2422

Laboratory microwave, millimeter wave and far-infrared spectra of dimethyl sulfide

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Spectroscopic Characterization and Detection of Ethyl Mercaptan in Orion

Cited by 107 publications

References 33 publications

THz spectroscopy and first ISM detection of excited torsional states of13C-methyl formate

THz spectroscopy and first ISM detection of excited torsional states of13C-methyl formate

Detection of CH3SH in protostar IRAS 16293-2422

Laboratory microwave, millimeter wave and far-infrared spectra of dimethyl sulfide

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THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

THz spectroscopy and first ISM detection of excited torsional states of¹³C-methyl formate

Detection of CH₃SH in protostar IRAS 16293-2422