VLTI/PIONIER reveals the close environment of the evolved system HD101584
J. Kluska, H. Olofsson, H. Van Winckel, T. Khouri, M. Wittkowski, W., J. de Wit, E. M. L. Humphreys, M. Lindqvist, M. Maercker, S. Ramstedt, D., Tafoya, W. H. T. Vlemmings

TL;DR
High-angular resolution near-infrared observations of HD101584 reveal a double-ring structure in its circumbinary environment, providing insights into dust distribution and outflow mechanisms in post-AGB systems.
Contribution
This study presents the first high-resolution imaging of HD101584's environment, uncovering a double-ring structure and linking it to outflow processes, advancing understanding of binary interactions in evolved stars.
Findings
Inner ring corresponds to dust sublimation front.
Outer ring may be linked to outflow launching site.
Morphological features constrain ejection mechanisms.
Abstract
Context: The observed orbital characteristics of post-asymptotic giant branch (post-AGB) and post-red giant branch (post-RGB) binaries are not understood. We suspect that the missing ingredients 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 and large-scale structures. Methods: We perform high-angular resolution observations in the near-infrared continuum of HD101584, which has a complex structure as seen at millimeter wavelengths with a disk-like morphology and a bipolar outflow due to an episode of 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…
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