TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H2CCS, H2CCCS, and C4S and detection of C5S

Cernicharo, J.; Cabezas, Carlos; Agúndez, M.; Tercero, B.; Pardo, J. R.; Marcelino, N.; Gallego, J. D.; Tercero, F.; López-Pérez, J. A.; Vicente, P. de

doi:10.1051/0004-6361/202140642

Cited by 71 publications

(32 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our results build on top of the studies unveiling the chemistry of sulfur in the ISM. Past and recent interstellar searches of saturated (Linke et al 1979;Kolesniková et al 2014;Rodríguez-Almeida et al 2021) and unsaturated (Fuente et al 2017;Martin-Drumel et al 2019;Cernicharo et al 2021;Rodríguez-Almeida et al 2021) S-bearing molecules present a scenario with many mysteries in their formation routes, each one of them contributing to understanding the amount of elemental sulfur locked in organosulfur compounds (Laas & Caselli 2019). In previous studies Lamberts (2018) showed that hydrogenation to saturation of CS is possible in astronomical timescales, indicating that highly saturated species (such as CH 3 SH or C 2 H 5 SH) must be prevalent in later stages of a molecular cloud life.…”

Section: Discussionmentioning

confidence: 99%

Diastereoselective Formation of trans-HC(O)SH Through Hydrogenation of OCS on Interstellar Dust Grains

Molpeceres,

de la Concepción,

Serra

2021

Preprint

View full text Add to dashboard Cite

With the presence of evermore complex S-bearing molecules being detected lately, studies on their chemical formation routes need to keep up the pace to rationalize observations, suggest new candidates for detection, and provide input for chemical evolution models. In this paper, we theoretically characterize the hydrogenation channels of OCS on top of amorphous solid water as an interstellar dust grain analog in molecular clouds. Our results show that the significant reaction outcome is trans−HC(O)SH, a recently detected prebiotic molecule toward G+0.693. The reaction is diastereoselective, explaining the seemingly absence of the cis isomer in the astronomical observations. We found that the reaction proceeds through a highly localized radical intermediate (cis−OCSH), which could be essential in the formation of other sulfur-bearing complex organic molecules due to its slow isomerization dynamics on top of amorphous solid water.

show abstract

Section: Discussionmentioning

confidence: 99%

Diastereoselective Formation of trans-HC(O)SH Through Hydrogenation of OCS on Interstellar Dust Grains

Molpeceres,

de la Concepción,

Serra

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…In addition to hydrocarbons (closed shells and radicals) and their cyano and ethynyl derivatives, TMC-1 revealed itself as an efficient sulfur factory, through the identification of a number of complex sulfur-bearing species in the QUIJOTE survey: HC 3 S + , HCCS, NCS, H 2 CCS, H 2 CCCS, C 4 S, HCSCN, and HCSCCH (Cernicharo et al, 2021h;Cernicharo et al, 2021i).…”

Section: Complex Organic Molecules In the Dark Cloud Tmc-1mentioning

confidence: 99%

Organic Molecules in Interstellar Space: Latest Advances

Guèlin

Cernicharo

2022

Front. Astron. Space Sci.

View full text Add to dashboard Cite

Although first considered as too diluted for the formation of molecules in-situ and too harsh an environment for their survival, the interstellar medium has turned out to host a rich palette of molecular species: to date, 256 species, not counting isotopologues, have been identified. The last decade, and more particularly the last 2 years, have seen an explosion of new detections, including those of a number of complex organic species, which may be dubbed as prebiotic. Organic molecules have been discovered not just in interstellar clouds from the Solar neighbourhood, but also throughout the Milky-Way, as well as in nearby galaxies, or some of the most distant quasars. These discoveries were made possible by the completion of large sub-millimetre and radio facilities. Equipped with new generation receivers, those instruments have provided the orders of magnitude leap in sensitivity required to detect the vanishingly weak rotational lines that allowed the molecule identifications. Last 2 years, 30 prebiotic molecules have been detected in TMC-1, a dust-enshrouded gaseous cloud located at 400 light-years from the Sun in the Taurus constellation. Ten new molecular species, have been identified in the arm of a spiral galaxy seven billion light-yr distant, and 12 molecular species observed in a quasar at 11 billion light-yr. We present the latest spectral observations of this outlying quasar and discuss the implications of those detections in these 3 archetypal sources. The basic ingredients involved in the Miller-Urey experiment and related experiments (H2, H2O, CH4, NH3, CO, H2S, … ) appeared early after the formation of the first galaxies and are widespread throughout the Universe. The chemical composition of the gas in distant galaxies seems not much different from that in the nearby interstellar clouds. It presumably comprises, like for TMC-1, aromatic rings and complex organic molecules putative precursors of the RNA nucleobases, except the lines of such complex species are too weak to be detected that far.

show abstract

“…4), with the HCOCH 2 CN value indicating an upper limit. We compare with other sources: several positions also in the Sgr B2 region (magenta; Brünken et al 2010, see also Marcelino et al 2010); several dense cores (B1-b, L1544, L183, L483) and the lukewarm corino L1527 (green: Marcelino et al 2010;Marcelino et al 2018); the dark cloud TMC-1 (yellow; Cernicharo et al 2021); and the IRAS 16293-2422 B hot corino (red, Zeng et al 2019). To derive the uncertainties of the molecular abundances we have considered the uncertainties of the molecular column densities reported in the different works, or a 15% of the value of N if the uncertainty is not provided, and we assumed an uncertainty for the N (H 2 ) column densities of 15%.…”

Section: Oxygen-bearing Nitrilesmentioning

confidence: 99%

Molecular precursors of the RNA-world in space: new nitriles in the G+0.693-0.027 molecular cloud

Rivilla¹,

Jiménez-Serra²,

Martı́n-Pintado³

et al. 2022

Preprint

View full text Add to dashboard Cite

Nitriles play a key role as molecular precursors in prebiotic experiments based on the RNA-world scenario for the origin of life. These chemical compounds could have been partially delivered to the young Earth from extraterrestrial objects, stressing the importance of establishing the reservoir of nitriles in the interstellar medium. We report here the detection towards the molecular cloud G+0.693-0.027 of several nitriles, including cyanic acid (HOCN), and three C 4 H 3 N isomers (cyanoallene, CH 2 CCHCN; propargyl cyanide, HCCCH 2 CN; and cyanopropyne (CH 3 CCCN), and the tentative detections of cyanoformaldehyde (HCOCN), and glycolonitrile (HOCH 2 CN). We have also performed the first interstellar search of cyanoacetaldehyde (HCOCH 2 CN), which was not detected. Based on the derived molecular abundances of the different nitriles in G+0.693-0.027 and other interstellar sources, we have discussed their formation mechanisms in the ISM. We propose that the observed HOCN abundance in G+0.693-0.027 is mainly due to surface chemistry and subsequent shock-induced desorption, while HCOCN might be mainly formed through gasphase chemistry. In the case of HOCH 2 CN, several grain-surface routes from abundant precursors 1

show abstract

TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H₂CCS, H₂CCCS, and C₄S and detection of C₅S

Cited by 71 publications

References 63 publications

Diastereoselective Formation of trans-HC(O)SH Through Hydrogenation of OCS on Interstellar Dust Grains

Diastereoselective Formation of trans-HC(O)SH Through Hydrogenation of OCS on Interstellar Dust Grains

Organic Molecules in Interstellar Space: Latest Advances

Molecular precursors of the RNA-world in space: new nitriles in the G+0.693-0.027 molecular cloud

Contact Info

Product

Resources

About