40 citations · 143 across the 17 of their papers we have counts for
20 papers
Evolved stars: dust formation and mass loss
Luis Velilla-Prieto, Wouter Vlemmings, Guillermo Quintana-Lacaci +18
Evolved stars drive the chemical enrichment of the Universe, acting as primary producers of elemental products of nucleosynthesis and cosmic dust. Unraveling the exact role played…
Evolved stars, multiplicity and planets: Shaping and Being Shaped by Stellar Evolution
Theo Khouri, Wouter Vlemmings, Elvire De Beck +21
Understanding how planets and stellar companions survive and interact with their host stars as they evolve, or are ultimately destroyed in the process, is essential both for predic…
MATISSE unveils a dusty disc in the interior of EP Aquarii. First evidence of a misaligned hierarchical triple system with a central AGB star?
J. Alonso-Hernández, C. Paladini, C. Sánchez Contreras +26
Aims. We have mapped the dust and molecular gas emission distributions in the vicinity (a few stellar radii) of the asymptotic giant branch (AGB) star EP\,Aquarii, with a previousl…
The formation radius of HCN in O-rich asymptotic giant branch stars
L. Marinho, J. P. Fonfría, 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…
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…
X TrA through the eyes of MATISSE: More evidence of clumpy molecular layers around C-type asymptotic giant branch stars
V. Răstău, C. Paladini, J. Drevon +22
Aims. The goal of this study is to further the understanding of the wind formation mechanism in asymptotic giant branch (AGB) stars through the analysis of the close environment (w…
Detection of the linear SiC and SiC radicals in IRC\,+10216
José Cernicharo, Juan Ramón Pardo, Marcelino Agúndez +6
We detected the linear radicals SiC and SiC toward IRC+10216 using an ultrasensitive line survey gathered with the Yebes 40\,m radio telescope. The derived column d…
Exploring circumstellar chemistry in X-ray emitting AGB stars
J. Alonso-Hernández, C. Sánchez Contreras, M. Agúndez +5
Aims. Our goal is to characterize the chemistry and physical conditions of the circumstellar envelopes (CSEs) of Asymptotic Giant Branch (AGB) binary candidate stars with UV-excess…
Reevaluation of ALMA detection of circumstellar PH3 in the AGB envelope IRC+10216: evidence for misidentification with HCN
M. Agundez, L. Velilla-Prieto, J. P. Fonfria +1
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…
ALMA observations of CO isotopologues towards six obscured post-AGB stars
T. Khouri, D. Tafoya, W. H. T. Vlemmings +13
Low- and intermediate-mass stars evolve through the asymptotic giant branch (AGB), when an efficient mass-loss process removes a significant fraction of their initial mass. A subst…
Atmospheric molecular blobs shape up circumstellar envelopes of AGB stars
L. Velilla-Prieto, J. P. Fonfría, M. Agúndez +8
During their thermally pulsing phase, Asymptotic Giant Branch (AGB) stars eject material that forms extended dusty envelopes. Visible polarimetric imaging found clumpy dust clouds…
Multi-line study of the radial extent of SiO, CS, and SiS in AGB envelopes
S. Massalkhi, M. Agundez, J. P. Fonfria +3
The spatial distribution of molecules in AGB circumstellar envelopes is regulated by different processes. In the outer layers all molecules are destroyed due to the interaction wit…
Molecular line polarisation from the circumstellar envelopes of Asymptotic Giant Branch stars
W. H. T. Vlemmings, B. Lankhaar, L. Velilla-Prieto
Polarisation observations of masers in the circumstellar envelopes (CSEs) around Asymptotic Giant Branch (AGB) stars have revealed strong magnetic fields. However, masers probe onl…
Dissecting the central regions of OH 231.8 + 4.2 with ALMA: a salty rotating disk at the base of a young bipolar outflow
C. Sánchez Contreras, J. Alcolea, R. Rodríguez Cardoso +5
We present ALMA continuum and molecular line emission maps at 1 mm of OH 231.8, a well studied bipolar nebula around an AGB star. The excellent angular resolution of our maps…
First detection of AlF line emission towards M-type AGB stars
M. Saberi, T. Khouri, L. Velilla-Prieto +3
The nucleosynthesis production of fluorine (F) is still a matter of debate. Asymptotic giant branch (AGB) stars are one of the main candidates for F production. However, their cont…
The abundance of S- and Si-bearing molecules in O-rich circumstellar envelopes of AGB stars
S. Massalkhi, M. Agúndez, J. Cernicharo +1
Aims: We aim to determine the abundances of SiO, CS, SiS, SO, and SO in a large sample of oxygen-rich AGB envelopes covering a wide range of mass loss rates to investigate the…
IRC+10216 mass loss properties through the study of 3mm emission: Large spatial scale distribution of SiO, SiS, and CS
L. Velilla-Prieto, J. Cernicharo, M. Agúndez +4
The study of the gas in the envelopes surrounding asymptotic giant branch (AGB) stars through observations in the millimetre wavelength range provides information about the history…
Discovery of the first Ca-bearing molecule in space: CaNC
J. Cernicharo, L. Velilla-Prieto, M. Agúndez +6
We report on the detection of calcium isocyanide, CaNC, in the carbon-rich evolved star IRC+10216. We derived a column density for this species of (2.00.5)10 cm…
Detection of highly excited OH towards AGB stars: A new probe of shocked gas in the extended atmospheres
T. Khouri, L. Velilla-Prieto, E. De Beck +5
We report the detection and investigate the properties of high-excitation lambda-doubling line emission of hydroxyl (OH) detected towards three asymptotic giant branch (AGB) stars…
Gas infall and possible circumstellar rotation in R Leo
J. P. Fonfría, M. Santander-García, J. Cernicharo +4
We present new interferometer molecular observations of R Leo taken at 1.2 mm with the Atacama Large Millimeter Array with an angular resolution up to ~0.026 arcsec. These observat…