A circumbinary protoplanetary disk in a polar configuration

Kennedy, Grant M.; Matrà, Luca; Facchini, Stefano; Milli, J.; Panić, Olja; Price, Daniel J.; Wilner, David J.; Wyatt, M. C.; Yelverton, Ben

doi:10.1038/s41550-018-0667-x

Cited by 101 publications

(122 citation statements)

References 51 publications

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“…Within this context, polar circumbinary discs are of particular interest since we have shown they form stable and prominent dusty clumps (e50-i90 and e75-i90). Theoretical models first predicted the existence of this kind of polar discs (Aly et al 2015;Martin & Lubow 2017;Zanazzi & Lai 2018;Lubow & Martin 2018), as the one very recently discovered in HD 98800 by Kennedy et al (2019). It seems reasonable to think that planets will eventually form in these polar circumbinary discs.…”

Section: Discussionmentioning

confidence: 91%

Dusty clumps in circumbinary discs

Poblete

Cuello

Cuadra

2019

Monthly Notices of the Royal Astronomical Society

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Recent observations have revealed that protoplanetary discs often exhibit cavities and azimuthal asymmetries such as dust traps and clumps. The presence of a stellar binary system in the inner disc regions has been proposed to explain the formation of these structures. Here, we study the dust and gas dynamics in circumbinary discs around eccentric and inclined binaries. This is done through two-fluid simulations of circumbinary discs, considering different values of the binary eccentricity and inclination. We find that two kinds of dust structures can form in the disc: a single horseshoe-shaped clump, on top of a similar gaseous over-density; or numerous clumps, distributed along the inner disc rim. The latter features form through the complex interplay between the dust particles and the gaseous spirals caused by the binary. All these clumps survive between one and several tens of orbital periods at the feature location. We show that their evolution strongly depends on the gas-dust coupling and the binary parameters. Interestingly, these asymmetric features could in principle be used to infer or constrain the orbital parameters of a stellar companion -potentially unseen -inside the inner disc cavity. Finally, we apply our findings to the disc around AB Aurigae.

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Section: Discussionmentioning

confidence: 91%

Dusty clumps in circumbinary discs

Poblete

Cuello

Cuadra

2019

Monthly Notices of the Royal Astronomical Society

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“…Statistical studies of discs around PMS binaries have not generally included systems with a 1 au since PMS multiplicity surveys at such close separations are highly incomplete; we note, however, that at least several PMS binaries with a 1 au are known to have high submillimetre fluxes (e.g. Mathieu et al 1995Mathieu et al , 1997Kennedy et al 2019). Thus, it is not known whether protoplanetary disc properties in a 1 au binaries are significantly different to those in a 100 au binaries, and the reason for the lower debris disc incidence that we find in close binaries is not clear.…”

Section: Relation To Protoplanetary Discsmentioning

confidence: 99%

A statistically significant lack of debris discs in medium separation binary systems

Yelverton

Kennedy

et al. 2019

Monthly Notices of the Royal Astronomical Society

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We compile a sample of 341 binary and multiple star systems with the aim of searching for and characterising Kuiper belt-like debris discs. The sample is assembled by combining several smaller samples studied in previously published work with targets from two unpublished Herschel surveys. We find that 38 systems show excess emission at 70 or 100 µm suggestive of a debris disc. While nine of the discs appear to be unstable to perturbations from their host binary based on a simple analysis of their inferred radii, we argue that the evidence for genuine instability is not strong, primarily because of uncertainty in the true disc radii, uncertainty in the boundaries of the unstable regions, and orbital projection effects. The binary separation distributions of the disc-bearing and disc-free systems are different at a confidence level of 99.4%, indicating that binary separation strongly influences the presence of detectable levels of debris. No discs are detected for separations between ∼25 and 135 au; this is likely a result of binaries whose separations are comparable with typical disc radii clearing out their primordial circumstellar or circumbinary material via dynamical perturbations. The disc detection rate is 19 +5 −3 % for binaries wider than 135 au, similar to published results for single stars. Only 8 +2 −1 % of systems with separations below 25 au host a detectable disc, which may suggest that planetesimal formation is inhibited in binaries closer than a few tens of au, similar to the conclusions of studies of known planet-hosting binaries.

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“…This is due to the coupled effect of nodal libration (Doolin & Blundell 2011) and gas damping in the circumbinary disc (Aly et al 2015;Martin & Lubow 2017;Zanazzi & Lai 2018;Cuello & Giuppone 2019). It is worth noting that the first polar circumbinary disc has been recently reported by Kennedy et al (2019).…”

Section: Implications For Currently Observed Misaligned Discsmentioning

confidence: 94%

Flyby-induced misalignments in planet-hosting discs

Nealon

Cuello

Alexander

2019

Monthly Notices of the Royal Astronomical Society

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We now have several observational examples of misaligned broken protoplanetary discs, where the disc inner regions are strongly misaligned with respect to the outer disc. Current models suggest that this disc structure can be generated with an internal misaligned companion (stellar or planetary), but the occurrence rate of these currently unobserved companions remains unknown. Here we explore whether a strong misalignment between the inner and outer disc can be formed without such a companion. We consider a disc that has an existing gap -essentially separating the disc into two regions -and use a flyby to disturb the discs, leading to a misalignment. Despite considering the most optimistic parameters for this scenario, we find maximum misalignments between the inner and outer disc of ∼ 45 • and that these misalignments are short-lived. We thus conclude that the currently observed misaligned discs must harbour internal, misaligned companions.

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A circumbinary protoplanetary disk in a polar configuration

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 101 publications

References 51 publications

Dusty clumps in circumbinary discs

Dusty clumps in circumbinary discs

A statistically significant lack of debris discs in medium separation binary systems

Flyby-induced misalignments in planet-hosting discs

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