VLTI images of circumbinary disks around evolved stars

Jacques Kluska; Rik Claes; Akke Corporaal; Hans Van Winckel; Javier Alcolea; Narsireddy Anugu; Jean-Philippe Berger; Dylan Bollen; Valentin Bujarrabal; Robert Izzard; Devika Kamath; Stefan Kraus; Jean-Baptiste Le Bouquin; Michiel Min; John D. Monnier; Hans Olofsson

doi:10.1117/12.2561480

13 December 2020 VLTI images of circumbinary disks around evolved stars

Jacques Kluska, Rik Claes, Akke Corporaal, Hans Van Winckel, Javier Alcolea, Narsireddy Anugu, Jean-Philippe Berger, Dylan Bollen, Valentin Bujarrabal, Robert Izzard, Devika Kamath, Stefan Kraus, Jean-Baptiste Le Bouquin, Michiel Min, John D. Monnier, Hans Olofsson

Author Affiliations +

Proceedings Volume 11446, Optical and Infrared Interferometry and Imaging VII; 114460D (2020) https://doi.org/10.1117/12.2561480
Event: SPIE Astronomical Telescopes + Instrumentation, 2020, Online Only

Abstract

The new generation of VLTI instruments (GRAVITY, MATISSE) aims to produce routinely interferometric images to uncover the morphological complexity of different objects at high angular resolution. Image recon- struction is, however, not a fully automated process. Here we focus on a specific science case, namely the complex circumbinary environments of a subset of evolved binaries, for which interferometric imaging provides the spatial resolution required to resolve the immediate circumbinary environment. Indeed, many binaries where the main star is in the post-asymptotic giant branch (post-AGB) phase are surrounded by circumbinary disks. Those disks were first inferred from the infrared excess produced by dust. Snapshot interferometric observations in the infrared confirmed disk-like morphology and revealed high spatial complexity of the emission that the use of geometrical models could not recover without being strongly biased. Arguably, the most convincing proof of the disk-like shape of the circumbinary environment came from the first interferometric image of such a system (IRAS08544-4431) using the PIONIER instrument at the VLTI. This image was obtained using the SPARCO image reconstruction approach that enables to subtract a model of a component of the image and reconstruct an image of its environment only. In the case of IRAS08544-4431, the model involved a binary and the image of the remaining signal revealed several unexpected features. Then, a second image revealed a different but also complex circumstellar morphology around HD101584 that was well studied by ALMA. To exploit the VLTI imaging capability to understand these targets, we started a large programme at the VLTI to image post-AGB binary systems using both PIONIER and GRAVITY instruments.

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Jacques Kluska, Rik Claes, Akke Corporaal, Hans Van Winckel, Javier Alcolea, Narsireddy Anugu, Jean-Philippe Berger, Dylan Bollen, Valentin Bujarrabal, Robert Izzard, Devika Kamath, Stefan Kraus, Jean-Baptiste Le Bouquin, Michiel Min, John D. Monnier, and Hans Olofsson "VLTI images of circumbinary disks around evolved stars", Proc. SPIE 11446, Optical and Infrared Interferometry and Imaging VII, 114460D (13 December 2020); https://doi.org/10.1117/12.2561480

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