The 2:1 resonant exoplanetary system orbiting HD 73526
View/ Open
Author
Tinney, C.G.
Butler, R.P.
Marcy, G.W.
Jones, H.R.A.
Laughlin, G.
Carter, B.D.
Bailey, J.
O'Toole, S.
Attention
2299/1104
Abstract
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 orbitalmigration, halted by stabilization in a trapping resonance, plays an important role in the evolution of exoplanets in multiple planet systems.