Coevolution of Binaries and Gaseous Discs

Abstract

The recent discoveries of circumbinary planets by $Kepler$ raise questions for contemporary planet formation models. Understanding how these planets form requires characterizing their formation environment, the circumbinary protoplanetary disc, and how the disc and binary interact and change as a result. The central binary excites resonances in the surrounding protoplanetary disc that drive evolution in both the binary orbital elements and in the disc. To probe how these interactions impact binary eccentricity and disc structure evolution, N-body smooth particle hydrodynamics (SPH) simulations of gaseous protoplanetary discs surrounding binaries based on Kepler 38 were run for $10^4$ binary periods for several initial binary eccentricities. We find that nearly circular binaries weakly couple to the disc via a parametric instability and excite disc eccentricity growth. Eccentric binaries strongly couple to the disc causing eccentricity growth for both the disc and binary. Discs around sufficiently eccentric binaries that strongly couple to the disc develop an $m=1$ spiral wave launched from the 1:3 eccentric outer Lindblad resonance (EOLR) that corresponds to an alignment of gas particle longitude of periastrons. All systems display binary semimajor axis decay due to dissipation from the viscous disc.

15 pages, 9 figures, Accepted for publication in MNRAS

References in corpus (11)

• Massive black hole binary mergers within sub-pc scale gas discs
• Rapid Formation of Supermassive Black Hole Binaries in Galaxy Mergers with Gas
• The Kozai-Lidov Mechanism in Hydrodynamical Disks
• Observational Evidence for Tidal Interaction in Close Binary Systems
• Misaligned gas discs around eccentric black-hole binaries and implications for the final-parsec problem
• Tidal Torques on Misaligned Disks in Binary Systems
• Precession and accretion in circumbinary discs: The case of HD 104237
• Orbital Decay of Supermassive Black Hole Binaries in Clumpy Multiphase Merger Remnants
• On the migration of protoplanets embedded in circumbinary disks
• A dynamical stability study of Kepler Circumbinary Planetary systems with one planet
• Fragmentation of protoplanetary disks around M-dwarfs

Cited by in corpus (6)

• Viscous Hydrodynamics Simulations of Circumbinary Accretion Discs: Variability, Quasi-Steady State, and Angular Momentum Transfer
• Polar alignment of a protoplanetary disk around an eccentric binary
• The Role of Disc Self-Gravity in Circumbinary Planet Systems: I. Disc Structure and Evolution
• Evolution of binary black holes in AGN accretion discs: Disc-binary interaction and gravitational wave emission
• The scattering outcomes of Kepler circumbinary planets: planet mass ratio
• The circumbinary rings of GG Carinae: indications of disc eccentricity growth in the B[e] supergiant's atomic emission lines