SPH modelling of AGB wind morphology in hierarchical triple systems \& comparison to observation of R Aql
A&A 691, A57 (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 can shape the outflow of AGB stars....
Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Journal Article |
| Language: | English |
| Published: |
29-08-2024
|
| Subjects: | |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | A&A 691, A57 (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 can shape the outflow of AGB stars. We focus on coplanar systems in a
hierarchical, stable orbit, consisting of an AGB star with one relatively close
companion, and one at large orbital separation. We model a grid of hierarchical
triple systems including a wind-launching AGB star, with the
smoothed-particle-hydrodynamic Phantom code. We vary the outer companion mass,
the AGB wind velocity and the orbital eccentricities to study the impact of
these parameters on the wind morphology. Further, we investigate if the outflow
of the AGB star R Aql could be shaped by a triple system, by post-processing
one of our triple models with a radiative transfer routine, and comparing this
to data of the ALMA ATOMIUM programme. The characteristic wind structures
resulting from a hierarchical triple system are the following. A large
two-edged spiral wake results behind the outer companion star. This structure
lies on top of the spiral structure formed by the close binary, which is
affected by the orbital motion around the system centre-of-mass. This dense
inner spiral pattern interacts with, and strongly impacts, the spiral wake of
the outer companion, resulting in a waved-pattern on the outer edge of this
spiral wake. From the comparison of our models to the observations of R Aql, we
conclude that this circumstellar environment might be shaped by a similar
system as the ones modelled in this work, but an elaborate study of the
observational data is needed to determine better the orbital parameters and
characteristics of the central system. |
|---|---|
| DOI: | 10.48550/arxiv.2408.16565 |