Belén Tercero's research while affiliated with The Manila Observatory and other places

Publications (36)

Article
Full-text available
We present the 3mm spectral line survey performed at the IRAM 30m telescope towards the dense cores B1-b and TMC-1. Within the 46 GHz observed, we have identified more than 500 lines arising from more than 60 molecules. We have also detected tens of unidentified lines, allowing the discovery of new molecular species in space. In this contribution w...
Article
Full-text available
Molecular lines observed in remote quasars arise from exceptionnally strong starburst regions in the vicinity of the QSO. Their study offers a unique opportunity to probe the gas physical and chemical properties at the epoch of peak star formation (z=2-3). We report the preliminary results of an on-going mm/sub-mm spectral line survey of the Clover...
Article
Full-text available
We present the recent results obtained with the QUIJOTE line survey of the cold dark core TMC-1. The observations have been carried out with the YEBES 40m radio telescope (see Figure 1) in the Q-band (31-50 GHz). A new set of receivers have been installed in the telescope within the frame of the ERC synergy Nanocosmos project that allows to cover t...
Preprint
We report the detection of fulvenallene ($c$-C$_5$H$_4$CCH$_2$) in the direction of TMC-1 with the QUIJOTE line survey. Thirty rotational transitions with $K_a$=0,1,2,3 and $J$=9-15 were detected. The best rotational temperature fitting of the data is 9\,K and a derived column density is (2.7$\pm$0.3)$\times$10$^{12}$ cm$^{-2}$, which is only a fac...
Article
Full-text available
We report the discovery of five cyano derivatives of propene towards TMC-1 with the QUIJOTE line survey: trans and cis -crotononitrile ( t -CH 3 CHCHCN, c -CH 3 CHCHCN), methacrylonitrile (CH 2 C(CH 3 )CN), and gauche and cis -allyl cyanide ( g -CH 2 CHCH 2 CN and c -CH 2 CHCH 2 CN). The observed transitions allowed us to derive a common rotational...
Article
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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...
Preprint
We report the discovery of five cyano derivatives of propene towards TMC-1 with the QUIJOTE line survey: $trans$ and $cis$-crotononitrile ($t$-CH$_3$CHCHCN, $c$-CH$_3$CHCHCN), methacrylonitrile (CH$_2$C(CH$_3$)CN), and $gauche$ and $cis$-allyl cyanide ($g$-CH$_2$CHCH$_2$CN and $c$-CH$_2$CHCH$_2$CN). The observed transitions allowed us to derive a c...
Preprint
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...
Preprint
Full-text available
Cyclic C5H (c-C5H), the radical formed by substituting an ethynyl group CCH for the hydrogen atom in the c-C3H radical, has been detected for the first time in the space. The c-C5H species is an isomer of the well-known linear radical l-C5H and is 6 kcal/mol less stable. A total of 17 rotational transitions were detected for the c-C5H species in TM...
Preprint
Full-text available
Theories on the origins of life propose that early cell membranes were synthesized from amphiphilic molecules simpler than phospholipids such as fatty alcohols. The discovery in the interstellar medium (ISM) of ethanolamine, the simplest phospholipid head group, raises the question whether simple amphiphilic molecules are also synthesized in space....
Article
Full-text available
We report the first detection of the phosphorus monoxide ion (PO+) in the interstellar medium. Our unbiased and very sensitive spectral survey toward the G+0.693–0.027 molecular cloud covers four different rotational transitions of this molecule, two of which (J = 1–0 and J = 2–1) appear free of contamination from other species. The fit performed,...
Article
Full-text available
We present the first detection of ( Z )-1,2-ethenediol, (CHOH) 2 , the enol form of glycolaldehyde, in the interstellar medium toward the G+0.693−0.027 molecular cloud located in the Galactic Center. We have derived a column density of (1.8 ± 0.1) × 10 ¹³ cm ⁻² , which translates into a molecular abundance with respect to molecular hydrogen of 1.3...
Preprint
We present the first detection of ($Z$)-1,2-ethenediol, (CHOH)$_2$, the enol form of glycolaldehyde, in the interstellar medium towards the G+0.693-0.027 molecular cloud located in the Galactic Center. We have derived a column density of (1.8$\pm$0.1)$\times$10$^{13}$ cm$^{-2}$, which translates into a molecular abundance with respect to molecular...
Preprint
Full-text available
We report the first detection of the phosphorus monoxide ion (PO$^{+}$) in the interstellar medium. Our unbiased and very sensitive spectral survey towards the G+0.693$-$0.027 molecular cloud covers four different rotational transitions of this molecule, two of which ($J$=1$-$0 and $J$=2$-$1) appear free of contamination from other species. The fit...
Article
We report the detection of two isomers of ethynyl cyclopentadiene ( c -C 5 H 5 CCH), namely 1- and 2-ethynyl-1,3-cyclopentadiene, in the direction of TMC-1. We derive column densities of (1.4 ± 0.2) × 10 ¹² cm ⁻² and (2.0 ± 0.4) × 10 ¹² cm ⁻² , respectively, for these two cyclopentadiene derivatives, which imply that they are about ten times less a...
Preprint
Full-text available
We report the detection of two isomers of ethynyl cyclopentadiene (c-C5H5CCH), namely 1- and 2-ethynyl-1,3-cyclopentadiene, in the direction of TMC-1. We derive column densities of (1.4 +/- 0.2)e12 cm-2, and (2.0 +/- 0.4)e12 cm-2, respectively, for these two cyclopentadiene derivatives, which imply that they are about ten times less abundant than c...
Preprint
Amines, in particular primary amines (R-NH$_2$) are closely related to the primordial synthesis of amino acids since they share the same structural backbone. However, only limited number of amines has been identified in the ISM which prevents us from studying their chemistry as well as their relation to pre-biotic species that could lead to the eme...
Article
Full-text available
Significance The detection of ethanolamine ( N H 2 C H 2 C H 2 OH) in a molecular cloud in the interstellar medium confirms that a precursor of phospholipids is efficiently formed by interstellar chemistry. Hence, ethanolamine could have been transferred from the proto-Solar nebula to planetesimals and minor bodies of the Solar System and thereafte...
Preprint
Cell membranes are a key element of life because they keep the genetic material and metabolic machinery together. All present cell membranes are made of phospholipids, yet the nature of the first membranes and the origin of phospholipids are still under debate. We report here the first detection in space of ethanolamine, NH$_2$CH$_2$CH$_2$OH, which...
Article
The chemical compounds carrying the thiol group (-SH) have been considered essential in recent prebiotic studies regarding the polymerization of amino acids. We have searched for this kind of compounds toward the Galactic Centre quiescent cloud G+0.693-0.027. We report the first detection in the interstellar space of the trans-isomer of monothiofor...
Preprint
The chemical compounds carrying the thiol group (-SH) have been considered essential in recent prebiotic studies regarding the polymerization of amino acids. We have searched for this kind of compounds toward the Galactic Centre quiescent cloud G+0.693-0.027. We report the first detection in the interstellar space of the trans-isomer of monothiofor...
Article
Rotational spectroscopy provides the most powerful means of identifying molecules of biological interest in the interstellar medium (ISM), but despite their importance, the detection of carbohydrates has remained rather elusive. Here, we present a comprehensive Fourier transform rotational spectroscopic study of elusive erythrulose, a sugar buildin...
Preprint
Full-text available
Our observations of TMC-1 with the Yebes 40 m radio telescope in the 31.0-50.3 GHz range allowed us to detect a group of unidentified lines, showing a complex line pattern indicative of an open-shell species. {}The observed frequencies of these lines and the similarity of the spectral pattern with that of the 2$_{0,2}$-1$_{0,1}$ rotational transiti...
Preprint
Full-text available
We investigate the chemical segregation of complex O-bearing species (including the largest and most complex ones detected to date in space) towards Orion KL, the closest high-mass star-forming region. The molecular line images obtained using the ALMA science verification data reveal a clear segregation of chemically related species depending on th...
Article
Full-text available
Ethyl cyanide is an abundant molecule in hot molecular clouds. Lines from 13C isotopically substituted ethyl cyanide were identified in Orion. To enable the search and the possible detection of other isotopologues of ethyl cyanide in interstellar objects, we have studied the rotational spectrum of deuterated ethyl cyanide: CH2DCH2CN (in-plane and o...

Citations

... More recent work by Jørgensen et al. (2012) also identified glycolaldehyde toward IRAS 16293-2422. The detection of the enol isomer of glycolaldehyde (HOCH 2 CHO), which forms via a hydrogen shift to produce an R 1 R 2 C = C(OH)R 3 substructure, was reported in laboratory astrochemistry experiments by Kleimeier & Kaiser (2022) and in deep space by Rivilla et al. (2022). Z-1,2-ethenediol (HOCHCHOH), only one hydroxyl group (-OH) away from ethenetriol (3), was detected toward the molecular cloud G+0.693-0.027 ...
... As mentioned abo v e, the detections of 1-and 2-cyanonaphthalene species in TMC-1 (McGuire et al. 2021 ) suggest that naphthalene should be quite abundant species in TMC-1. Cernicharo et al. ( 2021c ) reported the abundances for -CN and -CCH deri v ati ves of cyclopentadiene, and benzene and their results indicate that the CCH deri v ati v es hav e larger abundances for both systems. McGuire et al. ( 2021 ) discussed the formation routes for the cyanonaphthalenes and one of the considered reactions is that between naphthalene molecule and CN radical. ...
... Aminoacetonitrile (NH 2 CH 2 CN) has been detected in Sgr B2(N) (Belloche et al. 2008). The other three larger amines, vinylamine (C 2 H 3 NH 2 ) (Zeng et al. 2021), ethylamine (C 2 H 5 NH 2 ) (Zeng et al. 2021), and ethanolamine (NH 2 CH 2 CH 2 OH) (Rivilla et al. 2021), have been recently detected or tentatively detected in G+0.693-0.027. ...
... These are refractory species that, once trapped on the mantles or in the core of the grains, cannot desorb and, therefore, become undetectable (Woods et al. 2015). In the last three years, seven new gas-phase S-bearing species were identified, most of them in TMC-1 (Cernicharo et al. 2021;Rodríguez-Almeida et al. 2021), and characterized by a C-S chemical bond. ...
... Aminoacetonitrile (NH 2 CH 2 CN) has been detected in Sgr B2(N) (Belloche et al. 2008). The other three larger amines, vinylamine (C 2 H 3 NH 2 ) (Zeng et al. 2021), ethylamine (C 2 H 5 NH 2 ) (Zeng et al. 2021), and ethanolamine (NH 2 CH 2 CH 2 OH) (Rivilla et al. 2021), have been recently detected or tentatively detected in G+0.693-0.027. ...
... This has triggered the development of new sample preparation techniques as well as the use of ultrafast laser vaporization sources to avoid their decomposition (Cocinero et al., 2012;Calabrese et al., 2020). Recently, the rotational spectroscopy of C 4 and C 5 sugars such as erythrulose and ribose has been obtained in the laboratory (Cocinero et al., 2012;Insausti et al., 2021), which enables their search in interstellar space. ...
... Existing problems with the systematic understanding of interstellar sulfur chemistry [2][3][4][5] have motivated recent searches for new sulfur-bearing interstellar molecules. To that purpose, a number of studies of sulfur-bearing analogs, not yet detected in the ISM, of well known oxygen-bearing interstellar molecules have been performed in recent years: thioacetic acid (CH 3 COSH) [6], thioac-etamide (CH 3 CSNH 2 ) [7], dimethylsulfide ((CH 3 ) 2 S) [8], O-and S-thiomethylformates (CH 3 SCHO, CH 3 OCHS) [9]. In this work, we present the results of a new spectroscopic study for the thioacetaldehyde molecule (CH 3 CHS). ...