Discovery of an equal-mass ‘twin’ binary population reaching 1000 + au separations

@article{ElBadry2019DiscoveryOA,
  title={Discovery of an equal-mass ‘twin’ binary population reaching 1000 + au separations},
  author={Kareem El-Badry and Hans-Walter Rix and Haijun Tian and Gaspard Duch{\^e}ne and Maxwell Moe},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2019},
  volume={489},
  pages={5822-5857}
}
  • Kareem El-Badry, Hans-Walter Rix, +2 authors Maxwell Moe
  • Published 2019
  • Physics
  • Monthly Notices of the Royal Astronomical Society
  • We use a homogeneous catalog of 42,000 main-sequence wide binaries identified by Gaia to measure the mass ratio distribution, p(q), of binaries with primary masses $0.1<M_1/M_{\odot}<2.5$, mass ratios $0.1 \lesssim q<1$, and separations $50<s/{\rm AU}<50,000$. A well-understood selection function allows us to constrain p(q) in 35 independent bins of primary mass and separation, with hundreds to thousands of binaries in each bin. Our investigation reveals a sharp excess of equal-mass "twin… CONTINUE READING

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