Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2024

Multiwavelength high-resolution polarimetric imaging of second-generation disc around post-AGB binary IRAS 08544-4431 with SPHERE

Kateryna Andrych
  • Fonction : Auteur
Devika Kamath
  • Fonction : Auteur
Hans van Winckel
  • Fonction : Auteur
Jacques Kluska
  • Fonction : Auteur
Hans Martin Schmid
  • Fonction : Auteur
Akke Corporaal
  • Fonction : Auteur

Résumé

Exploring the formation and evolution of second-generation circumbinary discs around evolved binary stars, such as post-asymptotic giant branch (post-AGB) and post-red giant branch binaries, provides valuable insights into the complex binary interaction process that concludes the red-giant phase of evolution in these systems. Additionally, it offers a novel opportunity to investigate the formation of second-generation planets within dusty discs surrounding evolved stars. We present a pilot multiwavelength polarimetric imaging study of the post-AGB binary system IRAS 08544-4431 using the European Southern Observatory-Very Large Telescope/Spectro-Polarimetric High-contrast Exoplanet Research (VLT/SPHERE) instrument. This study is focused on optical V- and $I^{\prime }$-band Zurich Imaging Polarimeter (ZIMPOL) data to complement near-infrared (near-IR) H-band IRDIS data presented previously. The study aims to investigate the dust scattering properties and surface morphology of the post-AGB circumbinary disc as a function of wavelength. We successfully resolved the extended disc structure of IRAS 08544-4431, revealing a complex disc morphology, high polarimetric disc brightness (up to $\sim$1.5 %), and significant forward scattering at optical wavelengths. Additionally, we found that the disc shows a grey polarimetric colour in both optical and near-IR. The findings highlight similarities between post-AGB circumbinary discs and protoplanetary discs, suggesting submicron-sized porous aggregates as the dominant surface dust composition, and indicating potential warping within the disc. However, further expansion of the multiwavelength analysis to a larger sample of post-AGB binary systems, as well as high-resolution observations of dust continuum and gas emission, is necessary to fully explore the underlying structure of post-AGB circumbinary discs and associated physical mechanisms.
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insu-04836771 , version 1 (15-12-2024)

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Kateryna Andrych, Devika Kamath, Hans van Winckel, Jacques Kluska, Hans Martin Schmid, et al.. Multiwavelength high-resolution polarimetric imaging of second-generation disc around post-AGB binary IRAS 08544-4431 with SPHERE. Monthly Notices of the Royal Astronomical Society, 2024, 535, pp.1763-1777. ⟨10.1093/mnras/stae2406⟩. ⟨insu-04836771⟩
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