Explanipedia

Evidence for the Keplerian orbit of a close companion around a giant star Open

L. Decin, Y. Mori, Jolien Malfait, A. M. S. Richards, R. Sahai , et al. · 2025

Impact of a binary companion in AGB outflows on CO spectral lines Open

O. Vermeulen, M. Esseldeurs, Jolien Malfait, Thomas Ceulemans, L. Siess , et al. · 2025

Context . In the late stage of their evolution, low- to intermediate-mass stars pass through the asymptotic giant branch (AGB) phase. AGB stars are characterised by strong mass loss through dust driven winds. High angular resolution interf…

An accreting dwarf star orbiting the S-type giant star <i>π</i><sup>1</sup> Gru Open

M. Montargès, Jolien Malfait, M. Esseldeurs, A. de Koter, Frédérique Baron , et al. · 2025

Context. At the end of their lives, low- to intermediate-mass stars reach the asymptotic giant branch (AGB), during which their photospheres expand by up to several hundred times and strong stellar winds develop. These changes lead to vari…

Impact of H I cooling and study of accretion disks in asymptotic giant branch wind-companion smoothed particle hydrodynamic simulations Open

Jolien Malfait, L. Siess, M. Esseldeurs, F. De Ceuster, S. H. J. Wallström , et al. · 2024

Context. High-resolution observations reveal that the outflows of evolved low- and intermediate-mass stars harbour complex morphological structures that are linked to the presence of one or multiple companions. Hydrodynamical simulations p…

SPH modelling of AGB wind morphology in hierarchical triple systems and a comparison to observation of R Aql Open

Jolien Malfait, L. Siess, O. Vermeulen, M. Esseldeurs, S. H. J. Wallström , et al. · 2024

Context . Complex asymmetric 3D structures are observed in the outflows of evolved low- and intermediate-mass stars, and are believed to be shaped through the interaction of companions that remain hidden within the dense wind. One example …

SPH modelling of AGB wind morphology in hierarchical triple systems \& comparison to observation of R Aql Open

Jolien Malfait, L. Siess, O. Vermeulen, M. Esseldeurs, S. H. J. Wallström , et al. · 2024

Asymmetric 3D structures are observed in the outflows of evolved low- and intermediate-mass stars, and are believed to be shaped through the interaction of companions that are hidden within the dense wind. We investigate how triple systems…

Impact of HI cooling and study of accretion disks in AGB wind-companion smoothed particle hydrodynamic simulations Open

Jolien Malfait, L. Siess, M. Esseldeurs, Frederik De Ceuster, S. H. J. Wallström , et al. · 2024

High-resolution observations reveal that the outflows of evolved low- and intermediate-mass stars harbour complex morphological structures that are linked to the presence of one or multiple companions. Hydrodynamical simulations provide a …

Chemical tracers of a highly eccentric AGB–main-sequence star binary Open

T. Danilovich, Jolien Malfait, M. Van de Sande, M. Montargès, P. Kervella , et al. · 2024

ATOMIUM: Molecular inventory of 17 oxygen-rich evolved stars observed with ALMA Open

S. H. J. Wallström, T. Danilovich, H. S. P. Müller, C. A. Gottlieb, Silke Maes , et al. · 2023

Context. The dusty winds of cool evolved stars are a major contributor of the newly synthesised material enriching the Galaxy and future generations of stars. However, the details of the physics and chemistry behind dust formation and wind…

3D simulations of AGB stellar winds Open

M. Esseldeurs, L. Siess, Frederik De Ceuster, W. Homan, Jolien Malfait , et al. · 2023

Context. Stars with an initial mass below ~8 M ⊙ evolve through the asymptotic giant branch (AGB) phase, during which they develop a strong stellar wind, due to radiation pressure on newly formed dust grains. Recent observations have revea…

3D simulations of AGB stellar winds -- II. Ray-tracer implementation and impact of radiation on the outflow morphology Open

M. Esseldeurs, L. Siess, Frederik De Ceuster, W. Homan, Jolien Malfait , et al. · 2023

Stars with an initial mass below ~ 8 Msun evolve through the asymptotic giant branch (AGB) phase, during which they develop strong stellar winds. Recent observations have revealed significant morphological complexities in their outflows, m…

Chemical tracers of a highly eccentric binary orbit Open

T. Danilovich, Jolien Malfait, M. Van de Sande, M. Montargès, P. Kervella , et al. · 2023

Binary interactions have been proposed to explain a variety of circumstellar structures seen around evolved stars, including asymptotic giant branch (AGB) stars and planetary nebulae. Studies resolving the circumstellar envelopes of AGB st…

The VLT/SPHERE view of the ATOMIUM cool evolved star sample Open

M. Montargès, Emily Cannon, A. de Koter, T. Khouri, E. Lagadec , et al. · 2023

Context . Low- and intermediate-mass asymptotic giant stars and massive red supergiant stars are important contributors to the chemical enrichment of the Universe. They are among the most efficient dust factories of the Galaxy, harboring c…

The VLT/SPHERE view of the ATOMIUM cool evolved star sample. I. Overview: Sample characterization through polarization analysis Open

M. Montargès, E. Cannon, A. de Koter, T. Khouri, E. Lagadec , et al. · 2023

Aims. Through the ATOMIUM project, based on an ALMA large program, we aim to present a consistent view of a sample of 17 nearby cool evolved stars (Aymptotic Giant Branch and red supergiant stars). Methods. Here we present VLT/SPHERE-ZIMPO…

3D hydrodynamical survey of the impact of a companion on the morphology and dynamics of AGB outflow Open

Jolien Malfait, Silke Maes, W. Homan, J. Bolte, L. Siess , et al. · 2022

With the use of high-resolution ALMA observations, complex structures that resemble those observed in post-AGB stars and planetary nebulae are detected in the circumstellar envelopes of low-mass evolved stars. These deviations from spheric…

ATOMIUM: ALMA tracing the origins of molecules in dust forming oxygen rich M-type stars Open

C. A. Gottlieb, L. Decin, A. M. S. Richards, Frederik De Ceuster, W. Homan , et al. · 2021

This overview paper presents ATOMIUM , a Large Programme in Cycle 6 with the Atacama Large Millimeter/submillimeter Array (ALMA). The goal of ATOMIUM is to understand the dynamics and the gas phase and dust formation chemistry in the winds…

ATOMIUM: halide molecules around the S-type AGB star W Aquilae Open

T. Danilovich, M. Van de Sande, J. M. C. Plane, T. J. Millar, P. Royer , et al. · 2021

Context. S-type asymptotic giant branch (AGB) stars are thought to be intermediates in the evolution of oxygen- to carbon-rich AGB stars. The chemical compositions of their circumstellar envelopes are also intermediate but have not been st…

ATOMIUM: Halide molecules around the S-type AGB star W Aquilae Open

T. Danilovich, M. Van de Sande, J. M. C. Plane, T. J. Millar, P. Royer , et al. · 2021

S-type asymptotic giant branch (AGB) stars are thought to be intermediates in the evolution of oxygen- to carbon-rich AGB stars. The chemical compositions of their circumstellar envelopes are also intermediate, but have not been studied in…

SPH modelling of companion-perturbed AGB outflows including a new morphology classification scheme Open

Silke Maes, W. Homan, Jolien Malfait, L. Siess, J. Bolte , et al. · 2021

Context. Asymptotic giant branch (AGB) stars are known to lose a significant amount of mass by a stellar wind, which controls the remainder of their stellar lifetime. High angular-resolution observations show that the winds of these cool s…

SPH modelling of companion-perturbed AGB outflows including a new morphology classification scheme Open

Silke Maes, W. Homan, Jolien Malfait, L. Siess, J. Bolte , et al. · 2021

ABSTRACT Context. Asymptotic giant branch (AGB) stars are known to lose a significant amount of mass by a stellar wind, which controls the remainder of their stellar lifetime. High angular-resolution observations …

SPH modelling of companion-perturbed AGB outflows including a new morphology classification scheme Open

Silke Maes, W. Homan, Jolien Malfait, L. Siess, J. Bolte , et al. · 2021

Context. Asymptotic giant branch (AGB) stars are known to lose a significant amount of mass by a stellar wind, which controls the remainder of their stellar lifetime. High angular-resolution observations show that the winds of these cool s…

ATOMIUM: The astounding complexity of the near circumstellar environment of the M-type AGB star R Hydrae Open

W. Homan, B. Pimpanuwat, F. Herpin, T. Danilovich, Iain McDonald , et al. · 2021

Evolved low- to intermediate-mass stars are known to shed their gaseous envelope into a large, dusty, molecule-rich circumstellar nebula which typically develops a high degree of structural complexity. Most of the large-scale, spatially co…

3D hydrodynamical survey of the impact of a companion on the morphology and dynamics of AGB outflows Open

Jolien Malfait, Silke Maes, W. Homan, J. Bolte, L. Siess , et al. · 2020

With the use of high-resolution ALMA observations, complex structures that resemble those observed in post-AGB stars and planetary nebulae are detected in the circumstellar envelopes of low-mass evolved stars. These deviations from spheric…

Route towards complete 3D hydro-chemical simulations of companion-perturbed AGB outflows Open

Silke Maes, L. Siess, W. Homan, Jolien Malfait, Frederik De Ceuster , et al. · 2020

Low- and intermediate mass stars experience a significant mass loss during the last phases of their evolution, which obscures them in a vast, dusty envelope. Although it has long been thought this envelope is generally spherically symmetri…

magritte, a modern software library for 3D radiative transfer – II. Adaptive ray-tracing, mesh construction, and reduction Open

Frederik De Ceuster, J. Bolte, W. Homan, Silke Maes, Jolien Malfait , et al. · 2020

Radiative transfer is a notoriously difficult and computationally demanding problem. Yet, it is an indispensable ingredient in nearly all astrophysical and cosmological simulations. Choosing an appropriate discretization scheme is a crucia…

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