M. Agúndez
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View article: Discovery of linear propadienone. Study of the chemistry of linear and cyclic H_2C_3O and H_2C_3S in TMC-1
Discovery of linear propadienone. Study of the chemistry of linear and cyclic H_2C_3O and H_2C_3S in TMC-1 Open
We report the first detection in space of propadienone, the linear isomer (l-H_2C_3O) of cyclopropenone (c-H_2C_3O). We also report the first detection of the isotopologues c-H_2^13CCCO and c-HDCCCO of c-H_2C_3O. The astronomical observati…
View article: Gas-phase reactivity of CN towards interstellar N-bearing species (NH3, CH3NH2 and CH3CN) in the 11.7-177.5 K range
Gas-phase reactivity of CN towards interstellar N-bearing species (NH3, CH3NH2 and CH3CN) in the 11.7-177.5 K range Open
Nitrogen-bearing molecules, like ammonia (NH3), methylamine (CH3NH2) or acetonitrile (CH3CN), can be precursors of prebiotic molecules in the interstellar medium (ISM). In this work, the gas-phase kinetics of the CN reaction with NH3, CH3N…
View article: Isomer-Specific Branching Ratios in the Formation of Cyanopropene (C <sub>3</sub> H <sub>5</sub> CN) through the C <sub>3</sub> H <sub>6</sub> + CN Reaction under Interstellar Conditions
Isomer-Specific Branching Ratios in the Formation of Cyanopropene (C <sub>3</sub> H <sub>5</sub> CN) through the C <sub>3</sub> H <sub>6</sub> + CN Reaction under Interstellar Conditions Open
We investigated the reaction of propene (C3H6) with the cyano radical (CN) in light of the recent detection of five cyanopropene isomers in TMC-1. To provide reliable branching ratios, we characterized the stationary …
View article: Detection of six isotopologues of CH <sub>3</sub> CCCCH in TMC-1 with the QUIJOTE line survey
Detection of six isotopologues of CH <sub>3</sub> CCCCH in TMC-1 with the QUIJOTE line survey Open
We present the detection of the five 13 C isotopologues and the acetylenic deuterated species of CH 3 C 4 H towards TMC-1 using observations from the QUIJOTE line survey taken with the Yebes 40m telescope. The identification of the CH 3 C …
View article: Ion-molecule routes towards cycles in TMC-1. An automated study of the C2H4 + CH2CCH+ reaction
Ion-molecule routes towards cycles in TMC-1. An automated study of the C2H4 + CH2CCH+ reaction Open
Cyclopentadiene (c-C5H6) is considered a key molecule in the formation of polycyclic aromatic hydrocarbons (PAHs) in the interstellar medium (ISM). The synthesis of PAHs from simpler precursors is known as the "bottom-up" theory, which, so…
View article: Formic acid isomerism in dark clouds
Formic acid isomerism in dark clouds Open
The presence of molecular isomers in interstellar environments has become a topic of growing interest within the astrochemical community. Contrary to predictions based on thermodynamic equilibrium, recent observations reveal a diverse arra…
View article: Piecing together formic acid isomerism in dark clouds. Detection of cis-formic acid in TMC-1 and astrochemical modeling
Piecing together formic acid isomerism in dark clouds. Detection of cis-formic acid in TMC-1 and astrochemical modeling Open
The presence of molecular isomers in interstellar environments has become a topic of growing interest within the astrochemical community. Contrary to predictions based on thermodynamic equilibrium, recent observations reveal a diverse arra…
View article: Analysis of the isotopologues of CS, CCS, CCCS, HCS<sup>+</sup>, HCCS<sup>+</sup>, and H<sub>2</sub>CS in TMC-1 with the QUIJOTE line survey
Analysis of the isotopologues of CS, CCS, CCCS, HCS<sup>+</sup>, HCCS<sup>+</sup>, and H<sub>2</sub>CS in TMC-1 with the QUIJOTE line survey Open
We performed a detailed analysis of the isotopologues with 13 C, 34 S, 33 S, and 36 S of the sulphur-bearing molecules CS, CCS, CCCS, HCS + , HCCS + , and H 2 CS towards the starless core TMC-1 using the QUIJOTE 1 line survey. The observat…
View article: Discovery of interstellar phenalene (<i>c</i>-C<sub>13</sub>H<sub>10</sub>): A new piece in the chemical puzzle of PAHs in space
Discovery of interstellar phenalene (<i>c</i>-C<sub>13</sub>H<sub>10</sub>): A new piece in the chemical puzzle of PAHs in space Open
We present the discovery of the unsubstituted polycyclic aromatic hydrocarbon (PAH) phenalene (C 13 H 10 ) in TMC-1 as part of the QUIJOTE line survey. In spite of the low dipole moment of this three-ring PAH, we managed to identify a tota…
View article: Rotational spectroscopy investigation of the potential interstellar candidate phenylketene and its derivative phenylglyoxal
Rotational spectroscopy investigation of the potential interstellar candidate phenylketene and its derivative phenylglyoxal Open
The phenyl derivative of ketene, phenylketene (C$_6$H$_5$CHCO), can be considered as a candidate to be observed in the Taurus Molecular Cloud TMC-1. However, due to its high reactivity, there has been no microwave spectroscopic research co…
View article: Detection of the linear SiC<sub>3</sub> and SiC<sub>5</sub> radicals in IRC+10216
Detection of the linear SiC<sub>3</sub> and SiC<sub>5</sub> radicals in IRC+10216 Open
We detected the linear 3 Σ − radicals SiC 3 and SiC 5 toward IRC+10216 using an ultrasensitive line survey gathered with the Yebes 40 m radio telescope. The derived column densities of l -SiC 3 and l -SiC 5 are (3.6 ± 0.4) × 10 12 cm −2 an…
View article: Low D/H ratio for benzonitrile in TMC-1: Implication for the origin of polycyclic aromatic hydrocarbons in cold dark clouds
Low D/H ratio for benzonitrile in TMC-1: Implication for the origin of polycyclic aromatic hydrocarbons in cold dark clouds Open
Radioastronomical observations have recently discovered polycyclic aromatic hydrocarbons (PAHs) of moderate size (up to 24 carbon atoms) in cold dark clouds, although it is currently unknown whether they are formed in situ through a bottom…
View article: Detection of SiC <sub>6</sub> in IRC +10216 through <i>Q</i> -band lines
Detection of SiC <sub>6</sub> in IRC +10216 through <i>Q</i> -band lines Open
Ongoing Q -band (31–50 GHz) integrations on IRC +10216 with the Yebes 40m telescope have now reached the level of sub-mK noise, with hundreds of new lines arising above the 3 σ detection limit. Among them is a new, harmonically related ser…
View article: <i>JWST</i> reveals cosmic ray dominated chemistry in the local ULIRG IRAS 07251−0248
<i>JWST</i> reveals cosmic ray dominated chemistry in the local ULIRG IRAS 07251−0248 Open
We analyse the ro-vibrational absorption bands of various molecular cations (HCO$^+$, HCNH$^+$, and N$_2$H$^+$) and neutral species (HCN, HNC, and HC$_3$N) detected in the James Webb Space Telescope/Mid-Infrared Instrument Medium Resolutio…
View article: The mutual influence of disequilibrium composition and temperature in exoplanet atmospheres
The mutual influence of disequilibrium composition and temperature in exoplanet atmospheres Open
Astronomical observations have provided an extensive body of evidence for the existence of disequilibrium chemistry in many exoplanet atmospheres, and this departure from a chemical equilibrium composition may have an impact on the tempera…
View article: The mutual influence of disequilibrium composition and temperature in exoplanet atmospheres
The mutual influence of disequilibrium composition and temperature in exoplanet atmospheres Open
We have developed a 1D planetary atmosphere model that solves in a self-consistent manner the evolution of temperature and disequilibrium chemistry in the vertical direction. Thermochemical kinetics is based on a reaction network built fro…
View article: First detection of HS<sub>2</sub> in a cold dark cloud
First detection of HS<sub>2</sub> in a cold dark cloud Open
We report the first detection of HS 2 towards the cold dark cloud TMC-1. This is the first observation of a chemical species containing more than one sulphur atom in this type of sources. The astronomical observations are part of QUIJOTE, …
View article: Re-evaluation of ALMA detection of circumstellar $$\hbox {PH}_3$$ in the AGB envelope IRC$$+$$10216: Evidence for misidentification with HCN
Re-evaluation of ALMA detection of circumstellar $$\hbox {PH}_3$$ in the AGB envelope IRC$$+$$10216: Evidence for misidentification with HCN Open
View article: Exploring circumstellar chemistry in X-ray emitting AGB stars
Exploring circumstellar chemistry in X-ray emitting AGB stars Open
Aims . Our goal is to characterise the chemistry and physical conditions of the circumstellar envelopes (CSEs) of Asymptotic Giant Branch (AGB) binary candidate stars with UV-excess and X-ray emission. In particular, our aim is to identify…
View article: Discovery of propenethial (CH<sub>2</sub>CHCHS) in TMC-1
Discovery of propenethial (CH<sub>2</sub>CHCHS) in TMC-1 Open
We present the detection of propenethial (CH 2 CHCHS), the sulphur analogue of interstellar acrolein (CH 2 CHCHO), towards TMC-1. The detection of this new sulphur molecule in TMC-1 is based on the data derived from rotational spectroscopy…
View article: Rotational spectroscopy and astronomical search of the HCCSO radical
Rotational spectroscopy and astronomical search of the HCCSO radical Open
The number of sulphur-bearing species detected to date in the interstellar medium (ISM) is small compared to oxygen- and nitrogen-bearing species. In fact, the chemistry of sulphur-bearing molecules is strongly dependent on the depletion o…
View article: Reevaluation of ALMA detection of circumstellar PH3 in the AGB envelope IRC+10216: evidence for misidentification with HCN
Reevaluation of ALMA detection of circumstellar PH3 in the AGB envelope IRC+10216: evidence for misidentification with HCN Open
The article "Confirmation of interstellar phosphine towards asymptotic giant branch star IRC+10216" by A. Manna and S. Pal uses ALMA data of the C-star envelope IRC+10216 to claim a confirmation of the detection of PH3 in this source. The …
View article: Identification of the interstellar 1-cyano propargyl radical (HCCCHCN) in TMC-1
Identification of the interstellar 1-cyano propargyl radical (HCCCHCN) in TMC-1 Open
We report the first detection in interstellar medium of the 1-cyano propargyl radical, HC$_3$HCN. This species is an isomer of the 3-cyano propargyl radical (CH$_2$C$_3$N), which was recently discovered in TMC-1. The 1-cyano propargyl radi…
View article: Detection of thioacetaldehyde (CH<sub>3</sub>CHS) in TMC-1: Sulfur-oxygen differentiation along the hydrogenation sequence
Detection of thioacetaldehyde (CH<sub>3</sub>CHS) in TMC-1: Sulfur-oxygen differentiation along the hydrogenation sequence Open
In recent years, the chemistry of sulfur in the interstellar medium has experienced renewed interest due to the detection of a large variety of molecules containing sulfur. We report the first identification in space of a new S-bearing mol…
View article: Synthesis and Spectroscopic Characterization of Interstellar Candidate Ethynyl Thiocyanate: HCCSCN
Synthesis and Spectroscopic Characterization of Interstellar Candidate Ethynyl Thiocyanate: HCCSCN Open
This work aims to spectroscopically characterize and provide for the first time direct experimental frequencies of the ground vibrational state and two excited states of the simplest alkynyl thiocyanate (HCCSCN) for astrophysical use. Both…
View article: Discovery of two cyano derivatives of acenaphthylene (C<sub>12</sub>H<sub>8</sub>) in TMC-1 with the QUIJOTE line survey
Discovery of two cyano derivatives of acenaphthylene (C<sub>12</sub>H<sub>8</sub>) in TMC-1 with the QUIJOTE line survey Open
We report the discovery in TMC-1 of two cyano derivatives of the PAH acenaphthylene (C 12 H 8 ). We have found two series of lines with the QUIJOTE line survey that we assign to 1-C 12 H 7 CN and 5-C 12 H 7 CN. For the 1-isomer, we have de…
View article: Experimental Gas-Phase Removal of OH Radicals in the Presence of NH<sub>2</sub>C(O)H over the 11.7–353 K Range: Implications in the Chemistry of the Interstellar Medium and the Earth’s Atmosphere
Experimental Gas-Phase Removal of OH Radicals in the Presence of NH<sub>2</sub>C(O)H over the 11.7–353 K Range: Implications in the Chemistry of the Interstellar Medium and the Earth’s Atmosphere Open
Formamide (NH2C(O)H) has been observed both in the interstellar medium (ISM), being identified as a potential precursor of prebiotic molecules in space, and in the Earth's atmosphere. In these environments where temperature is v…
View article: The rich interstellar reservoir of dinitriles: Detection of malononitrile and maleonitrile in TMC-1
The rich interstellar reservoir of dinitriles: Detection of malononitrile and maleonitrile in TMC-1 Open
While the nitrile group is by far the most prevalent one among interstellar molecules, the existence of interstellar dinitriles (molecules containing two −CN groups) has recently been proven. Here we report the discovery of two new dinitri…
View article: Space and laboratory discovery of iminopentadienylidene, HNC<sub>5</sub>
Space and laboratory discovery of iminopentadienylidene, HNC<sub>5</sub> Open
We report the discovery of HNC 5 in TMC-1. Six lines have been found in harmonic relation, with quantum numbers J = 12−11 up to J = 17−16. The lines can be reproduced with the standard frequency relation for linear molecules with B = 1361.…
View article: More sulphur in TMC-1: Discovery of the NC<sub>3</sub>S and HC<sub>3</sub>S radicals with the QUIJOTE line survey
More sulphur in TMC-1: Discovery of the NC<sub>3</sub>S and HC<sub>3</sub>S radicals with the QUIJOTE line survey Open
We present the detection of the free radicals NC 3 S and HC 3 S towards TMC-1 with the QUIJOTE line survey. The derived column densities are (1.4 ± 0.2)×10 11 for NC 3 S and (1.5 ± 0.2)×10 11 for HC 3 S. We searched for NCCS, but only thre…