The perturbed sublimation rim of the dust disk around the post-AGB binary IRAS08544-4431

Kluska, J.; Hillen, M.; Winckel, H. Van; Manick, R.; Min, M.; Regibo, S.; Royer, P.

doi:10.1051/0004-6361/201832983

Cited by 34 publications

(81 citation statements)

References 61 publications

(76 reference statements)

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“…This results in unreliable distances for some of our stars. Nevertheless, the distances from Gaia have been shown to agree fairly well with other distance measurements in some cases, such as IRAS 08544-4431 (Kluska et al 2018), RV Tau and DF Cyg , and GK Car and GZ Nor . For other cases, the parallax measurement from Gaia is highly likely to be affected by the binary motion.…”

Section: Luminosity Determinationsupporting

confidence: 65%

Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars

Oomen

Winckel

Pols

et al. 2019

A&A

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Many disc-type post-asymptotic giant branch (post-AGB) stars are chemically peculiar, showing underabundances of refractory elements in their photospheres that correlate with condensation temperature. The aim of this paper is to investigate how accretion from a circumbinary disc can cause this phenomenon of depletion and how this impacts the evolution of post-AGB stars. We used the MESA code to evolve stars in the post-AGB phase, while including accretion of metal-poor gas. We compared the models to a sample of 58 observed disc-type post-AGB stars with chemical abundance data. For each of these stars, we estimated the luminosity and the mass using the Gaia distance. We modelled the accretion rate onto the binary from a viscously evolving disc for a range of initial accretion rates and disc masses. We find that large initial accretion rates ( 3 × 10 −7 M /yr) and large initial disc masses (∼ 10 −2 M ) are needed to reproduce the observed depleted post-AGB stars. Based on these high accretion rates, the evolution timescale of post-AGB stars can be significantly extended by a factor between two and five. We distinguish depletion patterns that are unsaturated (plateau profile) from those that are saturated, and we expect that post-red giant branch (post-RGB) stars are much more likely to show an unsaturated abundance pattern compared to post-AGB stars. Finally, because of the slower evolution of the low-mass post-RGB stars, we find that these systems can become depleted at lower effective temperatures (< 5000 K). We conclude that accretion from a circumbinary disc successfully accounts for the chemical peculiarity of post-AGB stars.

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Section: Luminosity Determinationsupporting

confidence: 65%

Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars

Oomen

Winckel

Pols

et al. 2019

A&A

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“…The here presented survey (see Figs. C.1 and C.2) and our imaging campaign of IRAS 08544-4431 (Hillen et al 2016;Kluska et al 2018) have demonstrated the potential of near-infrared interferometric images, have shown which targets can be well resolved with the existing instrumentation and which are most interesting for follow-up campaigns.…”

Section: Discussionmentioning

confidence: 76%

“…Despite very different forming processes, pAGB disks are in many ways (infrared excess, Keplerian rotation, winds, dust mass, dust mineralogy and grain sizes) similar to protoplanetary disks (PPDs) around young stellar objects (YSOs). Radiative transfer models of PPDs are able to successfully reproduce both the SED and infrared interferometric measurements on the few pAGB targets studied so far (Hillen et al 2014(Hillen et al , 2015Kluska et al 2018). As the PPDs are well studied both observationally and theoretically, the very close similarity with the disks around pAGB binaries points toward a potential universality of physical processes in dusty circumstellar disks occupying a different parameter space (i.e.…”

Section: Introductionmentioning

confidence: 80%

“…Interestingly, the Very Large Telescope Interferometer (VLTI) observations of one of the most studied pAGB-binaries, IRAS08544-4431, with the Precision Integrated-Optics Near-infrared Imaging ExpeRiment (PI-ONIER) in the near-infrared, detected a point-source emission at the position of the secondary. It should not be detectable if the emission was coming from a photosphere alone and it was tentatively linked with the circum-secondary accretion disk (Hillen et al 2016;Kluska et al 2018). The existence of this unexpected continuum emission from the secondary needs to be investigated in other systems as well.…”

Section: Introductionmentioning

confidence: 98%

“…a pAGB primary a main-sequence secondary surrounded by an accretion disk which launches a wide bipolar jet a binary orbit that is eccentric and not predicted by population synthesis models a circumbinary disk with a dust inner rim at a radius of several astronomical units, likely ruled by dust sublimation physics and that is azimuthally perturbed (e.g., Kluska et al 2018) a near-infrared extended flux from a yet unknown origin.…”

Section: Introductionmentioning

confidence: 99%

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VLTI/PIONIER survey of disks around post-AGB binaries

Kluska

Winckel

Hillen

et al. 2019

A&A

Self Cite

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Context. Post-AGB binaries are surrounded by circumbinary disks of gas and dust that are similar to protoplanetary disks found around young stars. Aims. We aim to understand the structure of these disks and identify the physical phenomena at play in their very inner regions. We want to understand the disk-binary interaction and to further investigate the comparison with protoplanetary disks. Methods. We have conducted an interferometric snapshot survey of 23 post-AGB binaries in the near-infrared (H-band) using VLTI/PIONIER. We have fitted the multiwavelength visibilities and closure phases with purely geometrical models with an increasing complexity (including two point-sources, an azimuthally modulated ring and an over-resolved flux) in order to retrieve the sizes, temperatures and flux ratios of the different components.Results. All sources are resolved and the different components contributing to the H-band flux are dissected. The environment of these targets is very complex: 13/23 targets need models with thirteen or more parameters to fit the data. We find that the inner disk rims follow and extend the size-luminosity relation established for disks around young stars with an offset toward larger sizes. The measured temperature of the near-infrared circumstellar emission of post-AGB binaries is lower (T sub ∼1200 K) than for young stars, probably due to a different dust mineralogy and/or gas density in the dust sublimation region. Conclusions. The dusty inner rims of the circumbinary disks around post-AGB binaries are ruled by dust sublimation physics. Additionally a significant amount of the circumstellar H-band flux is over-resolved (14 targets have more than 10% of their non-stellar flux over-resolved) hinting for more structure from a yet unknown origin (disk structure or outflow). The amount of over-resolved flux is larger than around young stars. Due to the complexity of these targets, interferometric imaging is a necessary tool to reveal the interacting inner regions in a model-independent way.

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Post-RGB and Post-AGB stars as tracers of binary evolution

Kamath

2018

Proc. IAU

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Binary interactions can alter the intrinsic properties of stars (such as: pulsation, mass-loss, photospheric chemistry, dust-formation, circumstellar envelope morphology etc.) and can even play a dominant role in determining its ultimate fate. While past studies have shown that binarity can end the AGB life of a star, recent studies have revealed that in specific cases binarity also pre-maturely terminate the RGB evolution. A characteristic feature of evolved binaries is the presence of a Keplerian circumbinary disc of gas and dust which plays a lead role in the evolution of the systems. In this article, I will review our advances in the research landscape of post-RGB and post-AGB binary stars, focussing on their observational properties, spectral energy distribution, photospheric chemistry, the evolution of their stable circumbinary discs, and the evolutionary connection between the enigmatic post-AGB/post-RGB binaries, and other systems whose primary component is a white dwarf.

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The perturbed sublimation rim of the dust disk around the post-AGB binary IRAS08544-4431

Cited by 34 publications

References 61 publications

Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars

Modelling depletion by re-accretion of gas from a dusty disc in post-AGB stars

VLTI/PIONIER survey of disks around post-AGB binaries

Post-RGB and Post-AGB stars as tracers of binary evolution

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