2009/01/14 by A. C. M. Correia, S. Udry, M. Mayor +9 · 2 citations
Physics and Astronomy · #Astro and Planetary Science #Astrophysics and Star Formation Studies #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361:200810774
6 pages, 6 figures
openalex publication_date 2009/01/14 · arxiv created 2009/02/03 · arxiv updated 2009/12/01 · openalex created_date 2021/02/01 · openalex updated_date 2026/07/31
Precise radial-velocity measurements with the HARPS spectrograph reveal the presence of two planets orbiting the solar-type star HD 45364. The companion masses are <i>M<i/> sin <i>i<i/> = 0.187 <i>M<i/><sub>Jup<sub/> and 0.658 <i>M<i/><sub>Jup<sub/>, with semi-major axes of AU and 0.897 AU, and eccentricities of and 0.097, respectively. A dynamical analysis of the system further shows a 3:2 mean motion resonance between the two planets, which prevents close encounters and ensures the stability of the system over 5 Gyr. This is the first time that such a resonant configuration has been observed for extra-solar planets, although there is an analogue in our Solar System formed by Neptune and Pluto. This singular planetary system may provide important constraints on planetary formation and migration scenarios.