Relative velocities among accreting planetesimals in binary systems: the circumbinary case
arXiv:0706.3524 · doi:10.1111/j.1365-2966.2007.12145.x
Abstract
We numerically investigate the possibility of planetesimal accretion in circumbinary disks, under the coupled influence of both stars' secular perturbations and friction due to the gaseous component of the protoplanetary disk. We focus on one crucial parameter: the distribution of encounter velocities between planetesimals in the 0.5 to 100km size range. An extended range of binary systems with differing orbital parameters is explored. The resulting encounter velocities are compared to the threshold velocities below which the net outcome of a collision is accumulation into a larger body instead of mass erosion. For each binary configuration, we derive the critical radial distance from the binary barycenter beyond which planetesimal accretion is possible. This critical radial distance is smallest for equal-mass binaries on almost circular orbits. It shifts to larger values for increasing eccentricities and decreasing mass ratio. The importance of the planetesimals' orbital alignments of planetesimals due to gas drag effects is discussed.
accepted for publication in MNRAS
References in corpus (5)
- Properties of planets in binary systems. The role of binary separation
- Relative velocities among accreting planetesimals in binary systems: the circumprimary case
- Terrestrial Planet Formation Surrounding Close Binary Stars
- Dust accretion onto high-mass planets
- Planetesimal accretion in binary star systems
Cited by in corpus (11)
- On the formation and migration of giant planets in circumbinary discs
- Terrestrial Planet Formation Surrounding Close Binary Stars
- The frequency of planets in multiple systems
- Planet formation in Alpha Centauri A revisited: not so accretion-friendly after all
- Planet formation in the habitable zone of alpha Centauri B
- A Statistical Stability Analysis of Earth-like Planetary Orbits in Binary Systems
- Planets in binary systems: is the present configuration indicative of the formation process?
- Planetesimal Accretion in Binary Systems: The Effects of Gas Dissipation
- On the evolution of multiple low mass planets embedded in a circumbinary disc
- Terrestrial Planet Formation in Extra-Solar Planetary Systems
- Observational Techniques for Detecting Planets in Binary Systems