Dust traffic jams in inclined circumbinary protoplanetary discs – I. Morphology and formation theory

Aly, Hossam S.; Gonzalez, Jean-François; Nealon, Rebecca; Longarini, Cristiano; Lodato, Giuseppe; Price, Daniel J.

doi:10.1093/mnras/stab2794

Cited by 13 publications

(7 citation statements)

References 103 publications

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“…It could also be that HD 142527 B formed at the lower end of the IMF, was dynamically captured, and is disrupting planet formation around HD 142527 A. In either scenario, its motion necessarily drives the dynamical evolution of the disk (e.g., Aly et al 2021).…”

Section: ~=mentioning

confidence: 99%

Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B

Balmer¹,

Follette²,

Close³

et al. 2022

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Companions embedded in the cavities of transitional circumstellar disks have been observed to exhibit excess luminosity at Hα, an indication that they are actively accreting. We report 5 yr (2013–2018) of monitoring of the position and Hα excess luminosity of the embedded, accreting low-mass stellar companion HD 142527 B from the MagAO/VisAO instrument. We use pyklip, a Python implementation of the Karhunen–Loeve Image Processing algorithm, to detect the companion. Using pyklip forward modeling, we constrain the relative astrometry to 1–2 mas precision and achieve sufficient photometric precision (±0.2 mag, 3% error) to detect changes in the Hα contrast of the companion over time. In order to accurately determine the relative astrometry of the companion, we conduct an astrometric calibration of the MagAO/VisAO camera against 20 yr of Keck/NIRC2 images of the Trapezium cluster. We demonstrate agreement of our VisAO astrometry with other published positions for HD 142527 B, and use orbitize! to generate a posterior distribution of orbits fit to the relative astrometry of HD 142527 B. Our data suggest that the companion is close to periastron passage, on an orbit significantly misaligned with respect to both the wide circumbinary disk and the recently observed inner disk encircling HD 142527 A. We translate observed Hα contrasts for HD 142527 B into mass accretion rate estimates on the order of 4–9 × 10−10 M ⊙ yr−1. Photometric variation in the Hα excess of the companion suggests that the accretion rate onto the companion is variable. This work represents a significant step toward observing accretion-driven variability onto protoplanets, such as PDS 70 b&c.

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Section: ~=mentioning

confidence: 99%

Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B

Balmer¹,

Follette²,

Close³

et al. 2022

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“…Option one is that these iron-rich clusters just drift inward and dissolve inside of the Curie line (Kruss & Wurm 2018). This might be in analogy to the snow line, where ice particles crossing the snow line evaporate and set dust grains free, creating a kind of traffic jam as the preferred site of planetesimal formation via direct gravitational instability (Saito & Sirono 2011;Ida & Guillot 2016;Aly et al 2021;Carrera et al 2021). The other option would be that the growth of iron-rich clusters is so efficient that it directly enables concentrations of, for instance, streaming instabilities and iron-rich planetesimals forming just outside of the Curie line.…”

Section: Magnetic Aggregation and The Curie Linementioning

confidence: 99%

The Curie line in protoplanetary disks and the formation of Mercury-like planets

Bogdan

Pillich

Landers

et al. 2023

A&A

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In laboratory experiments, we heated chondritic material up to 1400 K in a hydrogen atmosphere. Mössbauer spectroscopy and magnetometry reveal that, at high temperatures, metallic iron forms from silicates. The transition temperature is about 1200 K after 1 h of tempering, likely decreasing to about 1000 K for longer tempering. This implies that in a region of high temperatures within protoplanetary disks, inward drifting solids will generally be a reservoir of metallic iron. Magnetic aggregation of iron-rich matter then occurs within the magnetic field of the disk. However, the Curie temperature of iron, 1041 K, is a rather sharp discriminator that separates the disk into a region of strong magnetic interactions of ferromagnetic particles and a region of weak paramagnetic properties. We call this position in the disk the Curie line. Magnetic aggregation will be turned on and off here. On the outer, ferromagnetic side of the Curie line, large clusters of iron-rich particles grow and might be prone to streaming instabilities. To the inside of the Curie line, these clusters dissolve, but that generates a large number density that might also be beneficial for planetesimal formation by gravitational instability. One way or the other, the Curie line may define a preferred region for the formation of iron-rich bodies.

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“…These predictions are consistent with the recent observations of a misaligned disc in GW Ori [ 64 ]. Dust pile-ups are enhanced for higher disc inclinations and eccentricities, with local increase of dust-to-gas ratio up to ten times [ 141 ].…”

Section: Circumbinary Discsmentioning

confidence: 99%

Dust dynamics in planet-forming discs in binary systems

et al. 2023

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In multiple stellar systems, interactions among the companion stars and their discs affect planet formation. In the circumstellar case, tidal truncation makes protoplanetary discs smaller, fainter and less long-lived than those evolving in isolation, thereby reducing the amount of material (gas and dust) available to assemble planetary embryos. On the contrary, in the circumbinary case the reduced accretion can increase the disc lifetime, with beneficial effects on planet formation. In this chapter we review the main observational results on discs in multiple stellar systems and discuss their possible explanations, focusing on recent numerical simulations, mainly dealing with dust dynamics and disc evolution. Finally, some open issues and future research directions are examined.

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Dust traffic jams in inclined circumbinary protoplanetary discs – I. Morphology and formation theory

Cited by 13 publications

References 103 publications

Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B

Improved Orbital Constraints and Hα Photometric Monitoring of the Directly Imaged Protoplanet Analog HD 142527 B

The Curie line in protoplanetary disks and the formation of Mercury-like planets

Dust dynamics in planet-forming discs in binary systems

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