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

Abstract

We present the results of two-fluid hydrodynamical simulations of circumbinary discs consisting of gas and dust, with and without embedded planets, to examine the influence of the dust on the structure of the tidally truncated inner cavity and on the parking locations of migrating planets. In this proof-of-concept study, we consider Kepler-16 and -34 analogues, and examine dust fluids with Stokes numbers in the range $10^{-4}\le St\le 10^{-1}$ and dust-to-gas ratios of 0.01 and 1. For the canonical dust-to-gas ratio of 0.01, we find the inclusion of the dust has only a minor effect on the cavity and stopping locations of embedded planets compared to dust-free simulations. However, for the enhanced dust-to-gas ratio of unity, assumed to arise because of significant dust drift and accumulation, we find that the dust can have a dramatic effect by shrinking and circularising the inner cavity, which brings the parking locations of planets closer to the central binary. This work demonstrates the importance of considering both gas and dust in studies of circumbinary discs and planets, and provides a potential means of explaining the orbital properties of circumbinary planets such as Kepler-34b, which have hitherto been difficult to explain using gas-only hydrodynamical simulations.

arXiv commentAccepted for publication in MNRAS, 20 pages, 17 figures

References in corpus (40)

• Long-Term Stability of Planets in Binary Systems
• Kepler-16: A Transiting Circumbinary Planet
• Gas- and dust evolution in protoplanetary disks
• The Transiting Circumbinary Planets Kepler-34 and Kepler-35
• Kepler-47: A Transiting Circumbinary Multi-Planet System
• Runaway migration and the formation of hot Jupiters
• Reversing type II migration: resonance trapping of a lighter giant protoplanet
• The Migration and Growth of Protoplanets in Protostellar Discs
• FARGO3D: A new GPU-oriented MHD code
• The Dynamics and Stability of Circumbinary Orbits
• How not to build Tatooine: the difficulty of in situ formation of circumbinary planets Kepler 16b, Kepler 34b and Kepler 35b
• Asymptotically stable numerical method for multispecies momentum transfer: gas and multifluid-dust test suite and implementation in FARGO3D
• Kepler-1647b: the largest and longest-period Kepler transiting circumbinary planet
• On the formation and migration of giant planets in circumbinary discs
• Relative velocities among accreting planetesimals in binary systems: the circumbinary case
• Circumbinary Planet Formation in the Kepler-16 system. I. N-body Simulations
• TOI-1338: TESS' First Transiting Circumbinary Planet
• Migration and gas accretion scenarios for the Kepler 16, 34 and 35 circumbinary planets
• Modelling Circumbinary Planets: The case of Kepler-38
• Discovery of a Third Transiting Planet in the Kepler-47 Circumbinary System
• A thermodynamic view of dusty protoplanetary disks
• Circumbinary discs: Numerical and physical behaviour
• On the migration of protoplanets embedded in circumbinary disks
• Numerical simulations of type III planetary migration: III. Outward migration of massive planets
• The formation of planets in circumbinary disks
• Planet Formation in Circumbinary Configurations: Turbulence Inhibits Planetesimal Accretion
• Gap, shadows, spirals, streamers: SPHERE observations of binary-disk interactions in GG Tau A
• Migration of planets in circumbinary discs
• Forming Circumbinary Planets: N-body Simulations of Kepler-34
• Parking planets in circumbinary discs
• The curiously circular orbit of Kepler-16b
• On the evolution of multiple low mass planets embedded in a circumbinary disc
• The Role of Disc Self-Gravity in Circumbinary Planet Systems: I. Disc Structure and Evolution
• Hydrodynamical turbulence in eccentric circumbinary discs and its impact on the in situ formation of circumbinary planets
• Evolution of irradiated Circumbinary Disks
• BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b -- the first circumbinary planet detected with radial velocities
• Circumbinary discs with radiative cooling and embedded planets
• Vertical settling of pebbles in turbulent circumbinary discs and the in situ formation of circumbinary planets
• The Role of Disc Self-Gravity in Circumbinary Planet Systems: II. Planet Evolution
• Dust accretion in binary systems: implications for planets and transition discs

Cited by in corpus (6)

• Radial-velocity discovery of a second planet in the TOI-1338/BEBOP-1 circumbinary system
• Global N-body simulations of circumbinary planet formation around Kepler-16 and -34 analogues I: Exploring the pebble accretion scenario
• Viscous circumbinary protoplanetary discs -- I. Structure of the inner cavity
• A Dynamical Systems Approach to the Theory of Circumbinary Orbits in the Circular Restricted Problem
• Three-dimensional evolution of radiative circumbinary discs: the size and shape of the inner cavity
• Probing dust and grain growth in the optically thick circumbinary ring of V892 Tau