VLTI/PIONIER reveals the close environment of the evolved system HD 101584
Journal article, 2020

Context.The observed orbital characteristics of post-asymptotic giant branch and post-red giant branch (post-RGB) binaries are not understood. We suspect that the missing ingredients needed to explain them probably lie in the continuous interaction of the central binary with its circumstellar environment.
Aims.We aim at studying the circumbinary material in these complex systems by investigating the connection between the innermost structures and large-scale structures. Methods.We perform high-angular resolution observations of HD 101584 in the near-infrared continuum. HD 101584 has a complex structure as seen at millimeter wavelengths, with a disk-like morphology and a bipolar outflow due to an episode of a strong binary interaction. To account for the complexity of the target, we first perform an image reconstruction and use this result to fit a geometrical model to extract the morphological and thermal features of the environment.
Results.The image reveals an unexpected double ring structure. We interpret the inner ring as having been produced by emission from dust located in the plane of the disk, and the outer ring having been produced by emission from dust that is located 1.6 [D/1kpc] au above the disk plane. The inner ring diameter (3.94 [D/1kpc] au) and temperature (T= 1540 +/- 10 K) are compatible with the dust sublimation front of the disk. The origin of the out-of-plane ring (with a diameter of 7.39 [D/1kpc] au and a temperature of 1014 +/- 10 K) could be episodic ejection or a dust condensation front in the outflow.
Conclusions.The observed outer ring is possibly linked with the blue-shifted side of the large-scale outflow seen by the Atacama Large Millimeter/submillimeter Array and may trace its launching location to the central star. Such observations place morphological constraints on the ejection mechanism. Additional observations are needed to constrain the origin of the out-of-plane structure.

binaries: general

circumstellar matter

techniques: high angular resolution

outflows

techniques: interferometric

stars: AGB and post-AGB

stars: winds

Author

J. Kluska

KU Leuven

Hans Olofsson

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

H. Van Winckel

KU Leuven

Theo Khouri

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

M. Wittkowski

European Southern Observatory (ESO)

W. J. de Wit

European Southern Observatory (ESO)

E. M. L. Humphreys

European Southern Observatory (ESO)

Michael Lindqvist

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Observation Support

Matthias Maercker

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

S. Ramstedt

Uppsala University

Daniel Tafoya

Uppsala University

Chalmers, Space, Earth and Environment, Onsala Space Observatory, Observation Support

Wouter Vlemmings

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 642 A152

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/202037946

More information

Latest update

6/21/2021