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On the Planetary Orbital Period Ratio Distribution In Multiple Planet Systems

Published online by Cambridge University Press:  29 April 2014

Ji-Wei Xie
Ji-Wei Xie*
Affiliation:
Department of Astronomy & Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, 210093, China Department of Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4, Canada email: jwxie@astro.utoronto.ca
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Abstract

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Many multiple planet systems have been found by both radial velocity (RV) and transit surveys, such as the Kepler mission. Period ratio distribution of these planet candidates show that they do not prefer to be in or near Mean Motion Resonance (MMR). Nevertheless, there are small but significant excesses of candidate pairs both spaced slightly exterior to exact resonance, particular near the first order of MMR, such as 2:1 and 3:2. Here, we first review recent observational constraints on these multiple transiting systems and theoretical models, which attempt to understand their period ratio distributions. Then we identify a statistical effect based on an intrinsic asymmetry associated with MMR, and find it play an important role in shaping the period ratio distribution near MMR. Last but least, we also find such an intrinsic asymmetry is existing in asteroids of our solar system.

Keywords

celestial mechanics – planets and satellites: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S293: Formation, Detection, and Characterization of Extrasolar Habitable Planets , August 2012 , pp. 110 - 115
Copyright
Copyright © International Astronomical Union 2014 

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