12 papers
The formation radius of HCN in O-rich asymptotic giant branch stars
L. Marinho, J. P. FonfrÃa, M. Agúndez +3
Molecules detected in circumstellar envelopes around asymptotic giant branch (AGB) stars are generally well explained in terms of formation under chemical equilibrium in the stella…
The Significant Role of Hydrogen in the Formation of Silicon Carbide in Evolved Stars
Guillermo Tajuelo-Castilla, Gonzalo Santoro, Lidia MartÃnez +13
Cosmic dust is mainly formed in the atmospheres of evolved stars. In carbon rich stars, amorphous carbon along with silicon carbide are the main constituents of dust grains yet the…
Chemistry in the High expansion-velocity C-rich evolved star AFGL2233. Isotopic ratios, peculiarities and evolutionary status
G. Quintana-Lacaci, M. Agúndez, L. Velilla-Prieto +4
High expansion velocity carbon stars (HVCs) are a rare class of evolved stars whose circumstellar envelopes (CSEs) combine C-rich chemistry with unusually high expansion velocities…
Discovery of 1H-cyclopent[cd]indene (c-C11H8) in TMC-1 with the QUIJOTE line survey: A new three-ringed polycyclic aromatic hydrocarbon
R. Fuentetaja, C. Cabezas, M. Agúndez +4
We report the detection of the polycyclic aromatic hydrocarbon (PAH) 1H-cyclopent[cd]indene (c-C11H8) in TMC-1 with the QUI- JOTE line survey. We detected 22 independent lines corr…
Discovery of linear propadienone: Study of the chemistry of linear and cyclic HCO and HCS in TMC-1
G. Esplugues, J. C. Loison, M. Agúndez +4
We report the first detection in space of propadienone, the linear isomer (l-HCO) of cyclopropenone (c-HCO). We also report the first detection of the isotopologue…
Ion-molecule routes towards cycles in TMC-1. An automated study of the C2H4 + CH2CCH+ reaction
MarÃa Mallo, Marcelino Agúndez, Carlos Cabezas +3
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 simpl…