The 2: 1 resonant exoplanetary system orbiting HD 73526

C. G. Tinney*, R. Paul Butler, Geoffrey W. Marcy, Hugh R A Jones, Gregory Laughlin, Brad D. Carter, Jeremy A. Bailey, Simon O'Toole

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

67 Citations (Scopus)


We report the detection of a second exoplanet orbiting the G6 V dwarf HD 73526. This second planet has an orbital period of 377 days, putting it in a 2:1 resonance with the previously known exoplanet, the orbital period for which is updated to 188 days. Dynamical modeling of the combined system allows solution for a self-consistent set of orbital elements for both components. HD 73526 is the fourth exoplanetary system (of a total of 18 systems with two or more components currently known) to have components detected in 2:1 resonance. Finding such a large fraction of multiple planets (more than 20%) in 2:1 resonance strongly suggests that orbital migration, halted by stabilization in a trapping resonance, plays an important role in the evolution of exoplanets in multiple planet systems.

Original languageEnglish
Pages (from-to)594-599
Number of pages6
JournalAstrophysical Journal
Issue number1 I
Publication statusPublished - 10 Aug 2006


  • Planetary systems
  • Stars: individual (HD 73526)

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