Eccentricity distribution of wide low-mass binaries
arXiv:2004.06570 · doi:10.1093/mnras/staa1639
Abstract
Distribution of eccentricities of very wide (up to 10 kau) low-mass binaries in the solar neighborhood is studied using the catalog of El-Badry and Rix (2018) based on Gaia. Direction and speed of relative motions in wide pairs contain statistical information on the eccentricity distribution, otherwise inaccessible owing to very long orbital periods. It is found that the eccentricity distribution is close to the linear (thermal) one f(e) = 2e$ However, pairs with projected separations <200 au have less eccentric orbits, while f(e) for very wide pairs appears to be slightly super-thermal, with an excess of very eccentric orbits. Eccentricity of any wide binary can be constrained statistically using direction and speed of its motion. Thermal eccentricity distribution signals an important role of stellar dynamics in the formation of wide binaries, although disk-assisted capture also can produce such pairs with eccentric orbits.
Accepted for publication in MNRAS. 7 pages, 7 figures, 2 tables
References in corpus (2)
Cited by in corpus (29)
- Breakdown of the Newton-Einstein Standard Gravity at Low Acceleration in Internal Dynamics of Wide Binary Stars
- TOI-3714 b and TOI-3629 b: Two gas giants transiting M dwarfs confirmed with HPF and NEID
- Long-term Evolution of Binary Orbits Induced by Circumbinary Disks
- The non-monotonic, strong metallicity dependence of the wide-binary fraction
- Wide twin binaries are extremely eccentric: evidence of twin binary formation in circumbinary disks
- Wide Binaries from GAIA EDR3: preference for GR over MOND ?
- TOI-3984 A b and TOI-5293 A b: two temperate gas giants transiting mid-M dwarfs in wide binary systems
- Close Encounters of Wide Binaries Induced by the Galactic Tide: Implications for Stellar Mergers and Gravitational-Wave Sources
- Creation/destruction of ultra-wide binaries in tidal streams
- The mystery in Gaia DR3 triples: occurrence rates, orientations, and eccentricities of wide tertiaries around close binaries
- Three-Body Binary Formation in Clusters: Analytical Theory
- 10,000 Resolved Triples from Gaia: Empirical Constraints on Triple Star Populations
- Resolved Gaia Triples
- Eccentricity dynamics of wide binaries -- I. The effect of Galactic tides
- On the phase-mixed eccentricity and inclination distributions of wide binaries in the Galaxy
- Statistics of wide pre-main sequence binaries in the Orion OB1 association
- Wide binary stars formed in the turbulent interstellar medium
- No impact of core-scale magnetic field, turbulence, or velocity gradient on sizes of protostellar disks in Orion A
- Evolution of binary stars in the early evolutionary phases of ultra-faint dwarf galaxies
- Dynamical masses across the Hertzsprung-Russell diagram
- The onset of stellar multiplicity in massive star formation: A search for low-mass companions of massive young stellar objects with -band adaptive optics imaging
- Massive stellar triples on the edge: A numerical study of the evolution and final outcomes of destabilized massive triples
- Wide-binary eccentricity distribution in young star clusters: dependence on the binary separation and mass
- V838 Monocerotis as seen by ALMA: a remnant of a binary merger in a triple system
- The Eccentricity Distribution of Wide Binaries
- Beyond binarity in A stars II. Disentangling the four stars in the vicinity of the triple HIP 87813 within the quintuple system HJ2814
- On the Encounter Rate of Open Star Clusters
- The SPHERE view of multiple star formation
- The eccentricity distribution of wide binaries and their individual measurements