☆ 4.5 Review

Dust dynamics in planet-forming discs in binary systems

EUROPEAN PHYSICAL JOURNAL PLUS (2023)

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Article Astronomy & Astrophysics

Accretion process, magnetic fields, and apsidal motion in the pre-main sequence binary DQ Tau

Kim Pouilly et al.

Summary: The study aims to investigate the accretion and magnetic field of the tight eccentric binary system DQ Tau composed of two equal-mass CTTSs. The magnetic field topology and strengths in this system are compatible with the accretion processes on CTTSs. Both components of the system are found to be accreting, with a change of the main accretor during the orbital motion. Additionally, the system exhibits a strong enhancement of the mass accretion rate at periastron and apastron, and the apsidal motion of the orbital ellipse is discovered for the first time in this system.

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Article Astronomy & Astrophysics

A cold accretion flow onto one component of a multiple protostellar system

N. M. Murillo et al.

Summary: This study investigates the distribution of gas accretion flows within the cloud core of the chemically rich multiple protostellar system IRAS 16293-2422. Observations of low-J transitions of various molecules reveal extended structures traced by HC3N, HC5N, HNC, and N2H+, from 6000 AU down to 100 AU. Two structures are identified, one of which is likely accreting towards the most luminous component of the system, while the other is part of an uv-irradiated cavity wall entrained by an outflow.

ASTRONOMY & ASTROPHYSICS (2022)

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Article Astronomy & Astrophysics

High-resolution ALMA observations of V4046 Sgr: a circumbinary disc with a thin ring

Rafael Martinez-Brunner et al.

Summary: We present a physical model of the gas-rich disc of the nearby V4046 Sgr spectroscopic binary based on high resolution ALMA observations, SPHERE-IRDIS polarised images, and a well-sampled spectral energy distribution (SED). Our observations reveal the presence of thin rings (Ring13 and Ring24) with a wide gap in between, as well as a central emission interpreted as a tight circumbinary ring. The model also requires an inner ring (Ring5) composed mainly of small dust grains. The findings suggest a forward-scattering phase function and provide insights into the structure and composition of the disc.

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Article Astronomy & Astrophysics

Observational constraints on gas disc sizes in the protoplanetary discs of multiple systems in the Taurus region

A. A. Rota et al.

Summary: In this study, ALMA observations of multiple stellar systems reveal that the gas disc size is on average 4.2 times larger than the dust disc size, and that the outer dusty disc in multiple stellar systems is sharply truncated. These findings are consistent with tidal truncation models in multiple stellar systems.

ASTRONOMY & ASTROPHYSICS (2022)

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Article Astronomy & Astrophysics

Gas Disk Sizes from CO Line Observations: A Test of Angular Momentum Evolution

Feng Long et al.

Summary: The size of a disk encodes important information about its evolution. By analyzing data from a sample of 44 protoplanetary disks, we found that the size range can be explained by different models of viscous evolution or spread of initial conditions. Most disks' sizes are consistent with MHD wind models, but larger initial disk sizes are needed to explain the CO disks in the sample.

ASTROPHYSICAL JOURNAL (2022)

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Article Astronomy & Astrophysics

The Accretion Process in the DQ Tau Binary System

E. Fiorellino et al.

Summary: This research uses ESO/Very Large Telescope X-Shooter observations to study the mass accretion behavior of the binary star system DQ Tau. By analyzing the absorption lines, emission lines, and profiles in the spectra, the study investigates the mass accretion rates and their variations as a function of orbital phase.

ASTROPHYSICAL JOURNAL (2022)

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Article Astronomy & Astrophysics

Stellar multiplicity affects the correlation between protoplanetary disc masses and accretion rates: binaries explain high accretors in Upper Sco

Francesco Zagaria et al.

Summary: In recent years, a correlation between mass accretion rates onto new-born stars and their protoplanetary disc masses has been observed. However, highly accreting sources with low disc masses in more evolved regions remain puzzling. This paper hypothesizes that the presence of a stellar companion truncating the disc can explain these outliers. The hypothesis is supported by statistical analysis, which shows that binary systems have higher accretion rates compared to single-star systems.

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Article Astronomy & Astrophysics

Accretion on to a binary from a polar circumbinary disc

Jeremy L. Smallwood et al.

Summary: Hydrodynamical simulations have been used to model the accretion flow from a polar circumbinary disc onto a high eccentricity binary star system. The simulations show that the circumbinary disc retains its low eccentricity in the polar case, and the accretion rate on the primary star is similar to that on the secondary star. Recent observations of binary HD 98800 BaBb with a polar circumbinary disc suggest a lower accretion rate compared to typical T Tauri stars, possibly due to the eccentric orbit of the outer companion.

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Article Astronomy & Astrophysics

Dusty circumbinary discs: inner cavity structures and stopping locations of migrating planets

Gavin A. L. Coleman et al.

Summary: We present the results of two-fluid hydrodynamical simulations to investigate the influence of dust on the structure of circumbinary discs and the parking locations of migrating planets. The inclusion of dust has a minor effect when the dust-to-gas ratio is low, but has a dramatic effect when the dust-to-gas ratio is high, shrinking and circularizing the inner cavity and bringing the parking locations of planets closer to the central binary. This study emphasizes the importance of considering both gas and dust in studying circumbinary discs and planets.

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Article Astronomy & Astrophysics

Accretion rates in hierarchical triple systems with discs

Simone Ceppi et al.

Summary: Young multiple stellar systems experience differential accretion during the protostellar and protoplanetary phases, where the majority of mass is accreted onto the lighter star. This study investigates the accretion trends in hierarchical systems and reveals deviations from binary systems due to the interaction between small binaries and infalling material from the circumtriple disc. The findings suggest that the accretion mechanism in hierarchical systems can affect their mass ratio distribution.

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Article Astronomy & Astrophysics

How cooling influences circumbinary discs

Prakruti Sudarshan et al.

Summary: Observations and simulations of circumbinary discs have shown the presence of large eccentric inner cavities. The shape and size of these cavities depend on various factors, including disc properties, binary properties, and cooling timescale. This study investigates the effect of different cooling models on the cavity shape, comparing locally isothermal and radiatively cooled disc models to a parametrised cooling timescale model. The results show that the cavity shape remains comparable for radiative and isothermal models, but changes dramatically for the parametrised cooling model. A new parametrised beta model is introduced to accurately reproduce the results of the radiative model and highlight the importance of accurately modeling the thermodynamics inside the cavity in circumbinary systems.

ASTRONOMY & ASTROPHYSICS (2022)

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Article Astronomy & Astrophysics

The morphology of CS Cha circumbinary disk suggesting the existence of a Saturn-mass planet

N. T. Kurtovic et al.

Summary: By analyzing the observations and simulations of CS Cha, the study suggests a high possibility of planetary formation in circumbinary orbits, and the combination of low eccentricity and axisymmetry provides further evidence for this hypothesis.

ASTRONOMY & ASTROPHYSICS (2022)

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Article Astronomy & Astrophysics

GIARPS High-resolution Observations of T Tauri stars (GHOsT)IV. Accretion properties of the Taurus-Auriga young association

M. Gangi et al.

Summary: This study investigates the accretion properties of T Tauri stars and their relation with the properties of the central star, with jets and disk winds, and with the global disk structure. The results show possible causes for the observed large spreads in the relations and discuss correlations with the currently accepted models.

ASTRONOMY & ASTROPHYSICS (2022)

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Article Astronomy & Astrophysics

Accretion and Extinction Variations in the Low-mass Pre-main-sequence Binary System WX Cha

Eleonora Fiorellino et al.

Summary: Light curves of young star systems show photometric variability mainly due to changing mass accretion rate. In this study, we conducted optical and infrared photometry measurements of the MO binary system WX Cha, which has an almost edge-on disk. We calculated the accretion luminosity and mass accretion rate and found that WX Cha has a higher accretion rate compared to T Tauri stars in the same star-forming region. We propose that this is due to the higher disk mass and the binary nature of the system. Daily changes in the accretion luminosity and extinction can explain the observed photometric variability.

ASTROPHYSICAL JOURNAL (2022)

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Article Astronomy & Astrophysics

Accretion Variability of the Multiple T Tauri System VW Cha

Gabriella Zsidi et al.

Summary: This study investigates the accretion process, photometric, and spectroscopic variability of the classical T Tauri multiple system VW Cha. By analyzing TESS and ground-based observations, it is found that the TESS light curve shows photometric variations on timescales from minutes to weeks, and the near-infrared light curves follow the shape of the optical measurements with slightly increasing peak-to-peak amplitudes toward longer wavelengths. The brightening event is explained by increased accretion, and the spectroscopic data suggest that VW Cha is a spectroscopic binary.

ASTROPHYSICAL JOURNAL (2022)

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Article Astronomy & Astrophysics

Parking planets in circumbinary discs

Anna B. T. Penzlin et al.

Summary: The study shows that for binary systems with intermediate eccentricities, using specific disc parameters can closely match the observations, with planets massive enough to open gaps in the disc, migrate towards the binary and ultimately agree well with the observed orbital parameters. For systems with very small or very large binary eccentricities, the match was not as good as systems with very eccentric discs and large inner cavities hindered close-in planet migration. Test simulations with higher than observed planet masses showed better agreement.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data

Veselin B. Kostov et al.

Summary: In this study, the first transiting circumbinary planet detected from a single sector of TESS data is reported. The binary system itself is eclipsing, with a period of approximately 19.7 days and an eccentricity of approximately 0.45. The comprehensive analysis reveals that the mass and orbital properties of the planet are not uniquely determined, with six potential solutions of nearly equal likelihood.

ASTRONOMICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

ALMA Super-resolution Imaging of T Tau: r=12 au Gap in the Compact Dust Disk around T Tau N

Masayuki Yamaguchi et al.

Summary: Compact protoplanetary disks with dust radii of less than 20-40 au have been found to be predominant in nearby low-mass star formation regions. A newly developed super-resolution imaging technique utilizing sparse modeling (SpM) is applied to explore au-scale structures in such compact disks, revealing new structures like annular gaps and resolving binary star systems. Further ALMA observations are needed to confirm the existence of these substructures in the disks.

ASTROPHYSICAL JOURNAL (2021)

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Article Astronomy & Astrophysics

The effect of stellar multiplicity on protoplanetary discs: a near-infrared survey of the Lupus star-forming region

Alice Zurlo et al.

Summary: This study utilized near-infrared adaptive optics to survey pre-main-sequence stars in the Lupus molecular cloud, revealing that stars with massive and large discs typically lack visual companions, and that primaries tend to have more massive discs than secondaries. However, when disc mass and size are smaller, the distributions are similar between single and multiple systems.

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Article Astronomy & Astrophysics

Planet formation in intermediate-separation binary systems

O. Panic et al.

Summary: This study characterizes the individual discs in intermediate-separation binary systems at millimeter wavelengths. Asymmetries were found in the outer regions of primary discs, indicating potential perturbation by companions. Dust masses were high while gas masses were very low, suggesting giant planet formation may not be possible in these systems.

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Article Astronomy & Astrophysics

Measuring the ratio of the gas and dust emission radii of protoplanetary disks in the Lupus star-forming region

E. Sanchis et al.

Summary: A comprehensive study on the CO extent relative to dust in Lupus clouds revealed that CO emission is more extended than dust continuum, and dust evolution is more prominent in compact dusty disks. The majority of disks have similar size ratios, suggesting that the bulk of the disk population may behave alike and be in a similar evolutionary stage.

ASTRONOMY & ASTROPHYSICS (2021)

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Article Astronomy & Astrophysics

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

Hossam Aly et al.

Summary: Gas and dust in inclined orbits around binaries experience precession induced by binary gravitational torque, leading to density enhancements called "dust traffic jams" where weakly coupled dust alters radial drift. These traffic jams exist at different disc inclinations and binary eccentricities, providing significant dust density enhancements and playing a crucial role in the evolution of dust disc angular momentum.

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Article Astronomy & Astrophysics

A Coplanar Circumbinary Protoplanetary Disk in the TWA 3 Triple M Dwarf System

Ian Czekala et al.

Summary: The sensitive ALMA observations of TWA 3 revealed the structure of a young hierarchical system with three pre-main-sequence stars. The inner and outer orbits of the system's protoplanetary disk are consistent with theoretical predictions, while the influence of the outer orbit of star B on TWA 3A's circumbinary disk is primarily related to coplanarity.

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Dynamical dust traps in misaligned circumbinary discs: analytical theory and numerical simulations

Cristiano Longarini et al.

Summary: Recent observations have shown that circumbinary discs can be misaligned with respect to the binary orbital plane, causing differential precession and potentially inducing the propagation of warps. Dust traps formation in misaligned circumbinary discs may be induced by a difference in precession rates between the gas and dust, preventing radial drift and fostering dust growth. Numerical simulations show general agreement with theoretical predictions, indicating that such dust pile-up can promote planet formation in circumbinary discs.

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Article Astronomy & Astrophysics

On dust evolution in planet-forming discs in binary systems - I. Theoretical and numerical modelling: radial drift is faster in binary discs

Francesco Zagaria et al.

Summary: This study focuses on the evolution of dust grains in planet-forming discs in binary systems, showing that the presence of a stellar companion significantly reduces the amount of solids retained in binary discs and speeds up their dispersal. The rapid dispersal of dust in binary discs has a strong impact on planet formation, inhibiting the process in a hostile environment unless other disc substructures can halt radial drift further in.

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Article Astronomy & Astrophysics

Non-Keplerian spirals, a gas-pressure dust trap, and an eccentric gas cavity in the circumbinary disc around HD 142527

H. Garg et al.

Summary: ALMA observations of the circumbinary disc around HD 142527 reveal multiple spiral structures in intensity, velocity, and velocity dispersion for the CO isotopologues. A newly detected CO spiral originating from the dust horseshoe rotates at super-Keplerian velocity, while the interspiral gas rotates at sub-Keplerian velocities. The spatial offset between the CO-C-12 and CO-C-13 spirals suggests different propagation speeds due to a non-zero vertical temperature gradient. Gas surface density peaks at approximately 180au, coinciding with the peak of continuum emission.

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Article Astronomy & Astrophysics

Disks in close binary stars γ-Cephei revisited

Lucas M. Jordan et al.

Summary: This study investigates the dynamics of disks in close binaries, focusing on factors such as disk eccentricity and precession rate. Simulation results show that radiative disks in close binaries become eccentric after an initialization phase, with a slow retrograde precession and generally coherent, rigid precession. The study confirms the robustness of results through a parameter study for different numerical parameters.

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II. CVSO 104: A pre-main sequence close binary with an optical companion in Ori OB1

A. Frasca et al.

Summary: In this study, the close pre-main sequence spectroscopic binary CVSO 104 in Ori OB1 was analyzed, revealing the orbital elements and stellar parameters of the system, as well as a significant infrared excess related to a circumbinary disk. Both components were found to be accreting at a similar level, with excess emission observed in Hα and Hβ possibly connected to accretion structures. The optical companion CVSO 104 B was identified as a background Sun-like star not physically associated with the PMS system.

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Long Live the Disk: Lifetimes of Protoplanetary Disks in Hierarchical Triple-star Systems and a Possible Explanation for HD 98800 B

Maria Paula Ronco et al.

Summary: Gas dissipation from protoplanetary disks is influenced by binary star systems and external companions, but some disks can survive for over 10 million years due to tidal torques and disk truncation, with photoevaporation being the main gas dissipation mechanism. This is exemplified by the longevity of the circumbinary disk around HD 98800 B in a hierarchical quadruple stellar system.

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The Architecture of the V892 Tau System: The Binary and Its Circumbinary Disk

Feng Long et al.

Summary: High-resolution millimeter continuum and CO line observations were used to study the circumbinary disk around V892 Tau. The total mass of the two near-equal-mass A stars was estimated, and strong ionized gas emission was detected, leading to an updated view of the binary orbit.

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On the secular evolution of the ratio between gas and dust radii in protoplanetary discs

Claudia Toci et al.

Summary: The study focuses on the efficiency of dust radial drift in protoplanetary disc evolution models, showing that radial drift leads to faster dust disc shrinkage than observed, indicating that current models overestimate the effect of radial drift.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Impact of binary stars on planet statistics - I. Planet occurrence rates and trends with stellar mass

Maxwell Moe et al.

Summary: Close binary systems have a significant impact on the formation and occurrence rates of different types of planets, correcting the inferred occurrence rates of planets around various stars, and further evaluating and analyzing the surveys and data.

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY (2021)

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Circumbinary and circumstellar discs around the eccentric binary IRAS 04158+2805-a testbed for binary-disc interaction

Enrico Ragusa et al.

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On dust evolution in planet-forming discs in binary systems - II. Comparison with Taurus and ρ Ophiuchus (sub-)millimetre observations: discs in binaries have small dust sizes

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