The Role of Disc Self-Gravity in Circumbinary Planet Systems: II. Planet Evolution

Abstract

We present the results of hydrodynamic simulations examining migration and growth of planets embedded in self-gravitating circumbinary discs. The binary star parameters are chosen to mimic those of the Kepler-16, -34 and -35 systems; the aim of this study is to examine the role of disc mass in determining the stopping locations of migrating planets at the edge of the cavity created by the central binary. Disc self-gravity can cause significant shrinkage of the cavity for disc masses in excess of 5--10 $\times$ the minimum mass solar nebula model. Planets forming early in the disc lifetime can migrate through the disc and stall at locations closer to the central star than is normally the case for lower mass discs, resulting in closer agreement between simulated and observed orbital architecture. The presence of a planet orbiting in the cavity of a massive disc can prevent the cavity size from expanding to the size of a lower mass disc. As the disc mass reduces over long time scales, this indicates that circumbinary planet systems retain memory of their initial conditions. Our simulations produce planetary orbits in good agreement with Kepler-16b without the need for self-gravity; Kepler-34 analogue systems produce wide and highly eccentric cavities, and self-gravity improves the agreement between simulations and data. Kepler-35b is more difficult to explain in detail due to it's relatively low mass, which results in the simulated stopping location being at a larger radius than that observed.

arXiv commentAccepted for publication in MNRAS. 19 pages, 23 figures, 3 tables

References in corpus (40)

• Long-Term Stability of Planets in Binary Systems
• Kepler-16: A Transiting Circumbinary Planet
• On the width and shape of gaps in protoplanetary disks
• FARGO: a fast eulerian transport algorithm for differentially rotating disks
• Wind-driven Accretion in Protoplanetary Disks. I: Suppression of the Magnetorotational Instability and Launching of the Magnetocentrifugal Wind
• The Transiting Circumbinary Planets Kepler-34 and Kepler-35
• Mass Flow and Accretion through gaps in Accretion Discs
• Kepler-47: A Transiting Circumbinary Multi-Planet System
• The Migration and Growth of Protoplanets in Protostellar Discs
• On the corotation torque in a radiatively inefficient disk
• The Neptune-Sized Circumbinary Planet Kepler-38b
• Kepler-413b: a slightly misaligned, Neptune-size transiting circumbinary planet
• On the migration of protogiant solid cores
• KIC 9632895 - The 10th Kepler Transiting Circumbinary Planet
• Type I planetary migration in a self-gravitating disk
• How not to build Tatooine: the difficulty of in situ formation of circumbinary planets Kepler 16b, Kepler 34b and Kepler 35b
• Kepler-1647b: the largest and longest-period Kepler transiting circumbinary planet
• On the formation and migration of giant planets in circumbinary discs
• A Gas Giant Circumbinary Planet Transiting the F Star Primary of the Eclipsing Binary Star KIC 4862625 and the Independent Discovery and Characterization of the two transiting planets in the Kepler-47 System
• Relative velocities among accreting planetesimals in binary systems: the circumbinary case
• The hydrodynamical response of a tilted circumbinary disc: linear theory and non-linear numerical simulations
• On the corotation torque for low-mass eccentric planets
• Circumbinary Planet Formation in the Kepler-16 system. I. N-body Simulations
• Migration and gas accretion scenarios for the Kepler 16, 34 and 35 circumbinary planets
• Modelling Circumbinary Planets: The case of Kepler-38
• Global m=1 modes and migration of protoplanetary cores in eccentric protoplanetary discs
• On the migration of protoplanets embedded in circumbinary disks
• The formation of planets in circumbinary disks
• Planet Formation in Circumbinary Configurations: Turbulence Inhibits Planetesimal Accretion
• On the eccentricity of self-gravitating circumstellar disks in eccentric binary systems
• Forming Circumbinary Planets: N-body Simulations of Kepler-34
• Evolution of circumbinary planets around eccentric binaries: The case of Kepler-34
• Hydrodynamic instability in warped astrophysical 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
• The Local Instability of Steady Astrophysical Flows with non Circular Streamlines with Application to Differentially Rotating Disks with Free Eccentricity
• Hydrodynamic instability in eccentric astrophysical discs
• Self-Destructing Spiral Waves: Global Simulations of a Spiral Wave Instability in Accretion Disks
• Modelling circumbinary protoplanetary disks: I. Fluid simulations of the Kepler-16 and 34 systems

Cited by in corpus (10)

• Migration of planets in circumbinary discs
• Parking planets in circumbinary discs
• Circumbinary discs with radiative cooling and embedded planets
• Dusty circumbinary discs: inner cavity structures and stopping locations of migrating planets
• Global N-body simulations of circumbinary planet formation around Kepler-16 and -34 analogues I: Exploring the pebble accretion scenario
• A Pluto-Charon Sonata: The Dynamical Architecture of the Circumbinary Satellite System
• Simulations of the dynamics of the debris disks in the systems Kepler-16, Kepler-34, and Kepler-35
• A 3D Hydrodynamics Study of Gravitational Instabilities in a Young Circumbinary Disc
• Circumbinary planets: migration, trapping in mean-motion resonances, and ejection
• Stability of coorbital planets around binaries