A survey of multiple planet systems

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

8 Scopus citations


To date, over 30 multiple exoplanet systems are known, and 28% of stars with planets show significant evidence of a second companion. I briefly review these 30 systems individually, broadly grouping them into five categories: 1) systems with 3 or more giant (M sin i > 0.2 MJup) planets, 2) systems with two giant planets in mean motion resonance (MMR), 3) systems with two giant planets not in MMR but whose dynamical evolution is affected by planet-planet interactions, 4) highly hierarchical systems, having two giant planets with very large period ratios (>30:1), and 5) systems of "Super-Earths", containing only planets with (M sin i < 20 M⊕). It now appears that eccentricities are not markedly higher among planets in known multiple planet systems, and that planets with M sin i < 1 Mjup have lower eccentricities than more massive planets. The distribution of semimajor axes for planets in multi-planet systems does not show the 3-day pile-up or the 1 AU "jump" of the apparently-single planet distribution.

Original languageEnglish (US)
Title of host publicationExtrasolar Planets in Multi-Body Systems
Subtitle of host publicationTheory and Observations
Number of pages15
StatePublished - 2010
EventInternational Conference Eztrasolar Planets in Multi-Body Systems: Theory and Observations - Torun, Poland
Duration: Aug 25 2008Aug 29 2008

Publication series

NameEAS Publications Series
ISSN (Print)1633-4760
ISSN (Electronic)1638-1963


OtherInternational Conference Eztrasolar Planets in Multi-Body Systems: Theory and Observations

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • General Engineering
  • Space and Planetary Science


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