2006/02/25 by C. G. Tinney, R. Paul Butler, Geoffrey W. Marcy +9 · 3 citations
Physics and Astronomy · #Astro and Planetary Science #Astrobiology #Astronomy #Astrophysics and Star Formation Studies #Atomic physics #Exoplanet #Orbital elements #Orbital period #Physics #Planet #Planetary system #Resonance (particle physics) #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/503706
published as Astrophys.J.647:594-599,2006 · To appear in The Astrophysical Journal
arxiv created 2006/02/25 · openalex publication_date 2006/08/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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.