DETECTION OF SHARP SYMMETRIC FEATURES IN THE CIRCUMBINARY DISK AROUND AK Sco*

Janson, Markus; Thalmann, Christian; Boccaletti, A.; Maire, Anne-Lise; Zurlo, A.; Marzari, F.; Meyer, Michael; Carson, J.; Augereau, J.-C.; Garufi, A.; Henning, Thomas; Desidera, S.; Asensio-Torres, Rubén; Pohl, A.

doi:10.3847/2041-8205/816/1/l1

Cited by 42 publications

(77 citation statements)

References 35 publications

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“…3 we also applied an unsharp mask to the polarized intensity in order to enhance the disk structure. Other doublearch structures in TDs have been recently reported with highcontrast imaging instruments such as SPHERE (Janson et al 2016;Garufi et al 2016;Pohl et al 2017), but spiral-like features such as the one observed here have not yet been detected in very inclined disks. The spiral-like features detected in the RY Lup disk images could be created by an interaction of the disk with a planet located in its surrounding (Dong et al 2016).…”

Section: Disk Propertiessupporting

confidence: 52%

First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lupi

Langlois

Pohl

Lagrange

et al. 2018

A&A

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Context. Transition disks are considered sites of ongoing planet formation, and their dust and gas distributions could be signposts of embedded planets. The transition disk around the T Tauri star RY Lup has an inner dust cavity and displays a strong silicate emission feature. Aims. Using high-resolution imaging we study the disk geometry, including non-axisymmetric features, and its surface dust grain, to gain a better understanding of the disk evolutionary process. Moreover, we search for companion candidates, possibly connected to the disk. Methods. We obtained high-contrast and high angular resolution data in the near-infrared with the VLT/SPHERE extreme adaptive optics instrument whose goal is to study the planet formation by detecting and characterizing these planets and their formation environments through direct imaging. We performed polarimetric imaging of the RY Lup disk with IRDIS (at 1.6 µm), and obtained intensity images with the IRDIS dual-band imaging camera simultaneously with the IFS spectro-imager (0.9-1.3 µm). Results. We resolved for the first time the scattered light from the nearly edge-on circumstellar disk around RY Lup, at projected separations in the 100 au range. The shape of the disk and its sharp features are clearly detectable at wavelengths ranging from 0.9 to 1.6 µm. We show that the observed morphology can be interpreted as spiral arms in the disk. This interpretation is supported by in-depth numerical simulations. We also demonstrate that these features can be produced by one planet interacting with the disk. We also detect several point sources which are classified as probable background objects.

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Section: Disk Propertiessupporting

confidence: 52%

First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lupi

Langlois

Pohl

Lagrange

et al. 2018

A&A

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“…However, a deeper discussion is beyond the scope of the current paper. Broadly speaking, this doublewing structure is a new type of feature (see also AK Sco, Janson et al 2016) that may be recurrent among the observations of inclined disks carried-out with the new generation AO systems. Our exploration has shown that such a peculiar structure may still be interpreted in the context of a disk with an azimuthally continuous brightness distribution.…”

Section: Disk Morphology and Scattering Propertiesmentioning

confidence: 79%

The SPHERE view of the planet-forming disk around HD 100546

Garufi

Quanz

Schmid

et al. 2016

A&A

122

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Context. The mechanisms governing planet formation are not fully understood. A new era of high-resolution imaging of protoplanetary disks has recently started, thanks to new instruments such as SPHERE, GPI, and ALMA. The planet formation process can now be directly studied by imaging both planetary companions embedded in disks and their effect on disk morphology. Aims. We image disk features that could be potential signs of planet-disk interaction with unprecedented spatial resolution and sensitivity. Two companion candidates have been claimed in the disk around the young Herbig Ae/Be star HD 100546. Thus, this object serves as an excellent target for our investigation of the natal environment of giant planets. Methods. We exploit the power of extreme adaptive optics operating in conjunction with the new high-contrast imager SPHERE to image HD 100546 in scattered light. We obtained the first polarized light observations of this source in the visible (with resolution as fine as 2 AU) and new H and K band total intensity images that we analyzed with the  package.Results. The disk shows a complex azimuthal morphology, where multiple scattering of photons most likely plays an important role. High brightness contrasts and arm-like structures are ubiquitous in the disk. A double-wing structure (partly due to angular differential imaging processing) resembles a morphology newly observed in inclined disks. Given the cavity size in the visible (11 AU), the CO emission associated to the planet candidate c might arise from within the circumstellar disk. We find an extended emission in the K band at the expected location of b. The surrounding large-scale region is the brightest in scattered light. There is no sign of any disk gap associated to b.

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“…Even though there is an astrometric orbit for the AK Sco binary (Anthonioz et al 2015), the model used for the interferometric fit included a narrow ring with radius ∼0.5 au to mimic the contribution from the inner edge of a circumbinary disk. Subsequent scattered light observations (Janson et al 2016;Dong et al 2016) and sub-mm observations (Czekala et al, in prep) revealed that the dust in AK Sco is actually distributed in a narrow ring with a radius of ∼30 au, raising the possibility that the stellar orbital parameters from the interferometric model could be biased. For the purposes of the hierarchical model, we ignore the AK Sco astrometric orbit and treat Ω and θ as unknown.…”

Section: Notementioning

confidence: 99%

The Degree of Alignment between Circumbinary Disks and Their Binary Hosts

Czekala

Chiang

Andrews

et al. 2019

ApJ

112

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All four circumbinary (CB) protoplanetary disks orbiting short-period (P < 20 day) double-lined spectroscopic binaries (SB2s)-a group that includes UZ Tau E, for which we present new ALMA data-exhibit sky-plane inclinations i disk which match, to within a few degrees, the sky-plane inclinations i of their stellar hosts. Although for these systems the true mutual inclinations θ between disk and binary cannot be directly measured because relative nodal angles are unknown, the nearcoincidence of i disk and i suggests that θ is small for these most compact of systems. We confirm this hypothesis using a hierarchical Bayesian analysis, showing that 68% of CB disks around short-period SB2s have θ < 3.0 • . Near co-planarity of CB disks implies near co-planarity of CB planets discovered by Kepler, which in turn implies that the occurrence rate of close-in CB planets is similar to that around single stars. By contrast, at longer periods ranging from 30-10 5 days (where the nodal degeneracy can be broken via, e.g., binary astrometry), CB disks exhibit a wide range of mutual inclinations, from co-planar to polar. Many of these long-period binaries are eccentric, as their component stars are too far separated to be tidally circularized. We discuss how theories of binary formation and disk-binary gravitational interactions can accommodate all these observations.

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DETECTION OF SHARP SYMMETRIC FEATURES IN THE CIRCUMBINARY DISK AROUND AK Sco*

Cited by 42 publications

References 35 publications

First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lupi

First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lupi

The SPHERE view of the planet-forming disk around HD 100546

The Degree of Alignment between Circumbinary Disks and Their Binary Hosts

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