OBLIQUITIES OF KEPLER STARS: COMPARISON OF SINGLE- AND MULTIPLE-TRANSIT SYSTEMS
Author(s)Morton, Timothy D.; Winn, Joshua Nathan
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The stellar obliquity of a transiting planetary system can be constrained by combining measurements of the star's rotation period, radius, and projected rotational velocity. Here, we present a hierarchical Bayesian technique for recovering the obliquity distribution of a population of transiting planetary systems and apply it to a sample of 70 Kepler objects of interest. With ≈95% confidence, we find that the obliquities of stars with only a single detected transiting planet are systematically larger than those with multiple detected transiting planets. This suggests that a substantial fraction of Kepler's single-transiting systems represent dynamically hotter, less orderly systems than the "pancake-flat" multiple-transiting systems.
DepartmentMassachusetts Institute of Technology. Department of Physics; MIT Kavli Institute for Astrophysics and Space Research
The Astrophysical Journal
Morton, Timothy D., and Joshua N. Winn. “OBLIQUITIES OF KEPLER STARS: COMPARISON OF SINGLE- AND MULTIPLE-TRANSIT SYSTEMS.” The Astrophysical Journal 796, no. 1 (November 4, 2014): 47. © 2014 The American Astronomical Society
Final published version