Results 1 to 10 of about 199,320 (131)
Discovery of the elusive thioketenylium, HCCS+, in TMC-1 [PDF]
A&A 657, L4 (2022), 2021 We report the detection in TMC-1 of the cation HCCS+ (3Sigma-), which is the protonated form of the widespread radical CCS. This is the first time that a protonated radical has been detected in a cold dark cloud. Twenty-six hyperfine components from twelve rotational transitions have been observed with the Yebes 40m and IRAM 30m radio telescopes.
arxiv +1 more source
Discovery of C5H+ and detection of C3H+ in TMC-1 with the QUIJOTE line survey [PDF]
A&A 657, L16 (2022), 2022 We report the discovery of the C5H+ cation toward TMC-1 with the QUIJOTE line survey. Four lines from J=7-6 up to J=10-9 have been identified in perfect harmonic frequency relation that can be fit with B=2411.94397 +/-0.00055 MHz and D=138+/-3 Hz. The standard deviation of the fit is 4.4 kHz.
arxiv +1 more source
Discovery of two metallic cyanoacetylides in IRC+10216: HMgCCCN and NaCCCN [PDF]
A&A 672, L12 (2023), 2023 We report on the detection of a series of six lines in the ultra-deep Q-band integration toward IRC+10216 carried out with the Yebes 40m telescope, which are in harmonic relation with integer quantum numbers J from 12 to 18. After a detailed analysis of all possible carriers, guided by high-level quantum chemical calculations, we conclude that the ...
arxiv +1 more source
Laboratory and astronomical discovery of the cyanovinyl radical H2CCCN [PDF]
A&A 676, L5 (2023), 2023 We report the first laboratory and interstellar detection of the alpha-cyano vinyl radical (H2CCCN). This species was produced in the laboratory by an electric discharge of a gas mixture of vinyl cyanide, CH2CHCN, and Ne, and its rotational spectrum was characterized using a Balle-Flygare narrowband-type Fourier-transform microwave spectrometer ...
arxiv +1 more source
The sulphur saga in TMC-1: Discovery of HCSCN and HCSCCH [PDF]
A&A 650, L14 (2021), 2021 We report the detection, for the first time in space, of cyano thioformaldehyde (HCSCN) and propynethial (HCSCCH) towards the starless core TMC-1. Cyano thioformaldehyde presents a series of prominent a- and b-type lines, which are the strongest previously unassigned features in our Q-band line survey of TMC-1.
arxiv +1 more source
Discovery of the acetyl cation, CH3CO+, in space and in the laboratory [PDF]
A&A 646, L7 (2021), 2021 Using the Yebes 40m and IRAM 30m radiotelescopes, we detected two series of harmonically related lines in space that can be fitted to a symmetric rotor. The lines have been seen towards the cold dense cores TMC-1, L483, L1527, and L1544. High level of theory ab initio calculations indicate that the best possible candidate is the acetyl cation, CH3CO ...
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Space and laboratory discovery of HC3S+ [PDF]
A&A 646, L3 (2021), 2021 We report the detection in TMC-1 of the protonated form of C3S. The discovery of the cation HC3S+ was carried through the observation of four harmonically related lines in the Q band using the Yebes 40m radiotelescope, and is supported by accurate ab initio calculations and laboratory measurements of its rotational spectrum.
arxiv +1 more source
Hot methanol in the [BHB2007] 11 protobinary system: hot corino versus shock origin? : FAUST V [PDF]
A&A 664, A171 (2022), 2022 Methanol is a ubiquitous species commonly found in the molecular interstellar medium. It is also a crucial seed species for the building-up of the chemical complexity in star forming regions. Thus, understanding how its abundance evolves during the star formation process and whether it enriches the emerging planetary system is of paramount importance ...
arxiv +1 more source
FAUST VIII. The protostellar disk of VLA 1623-2417 W and its streamers imaged by ALMA [PDF]
, 2023 More than 50% of solar-mass stars form in multiple systems. It is therefore crucial to investigate how multiplicity affects the star and planet formation processes at the protostellar stage. We report continuum and C$^{18}$O (2-1) observations of the VLA 1623-2417 protostellar system at 50 au angular resolution as part of the ALMA Large Program FAUST ...
arxiv +1 more source
Discovery of HC3O+ in space: The chemistry of O-bearing species in TMC-1 [PDF]
, 2020 Using the Yebes 40m and IRAM 30m radio telescopes, we detected a series of harmonically related lines with a rotational constant B0=4460.590 +/- 0.001 MHz and a distortion constant D0=0.511 +/- 0.005 kHz towards the cold dense core TMC-1. High-level-of-theory ab initio calculations indicate that the best possible candidate is protonated tricarbon ...
arxiv +1 more source