The BANANA survey: Spin-orbit alignment in binary stars

Simon Albrecht, J. N. Winn, D. C. Fabrycky, G. Torres, J. Setiawan

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Binaries are not always neatly aligned. Previous observations of the DI Herculis system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here, we report on our ongoing survey to measure relative orientations of spin-axes in a number of eclipsing binary systems. These observations will hopefully lead to new insights into star and planet formation, as different formation scenarios predict different degrees of alignment and different dependencies on the system parameters. Measurements of spin-orbit angles in close binary systems will also create a basis for comparison for similar measurements involving close-in planets.

Original languageEnglish (US)
Title of host publicationFrom Interacting Binaries to Exoplanets
Subtitle of host publicationEssential Modeling Tools
EditorsMercedes Richards, Ivan Hubeny
Number of pages2
StatePublished - Jul 2011
Externally publishedYes

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science


  • binaries: eclipsing
  • stars: rotation
  • techniques: spectroscopic


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