Astrophysics, abstract
astro-ph/0602557

From: Chris Tinney [view email]

Date: Sat, 25 Feb 2006 06:23:52 GMT (84kb)

The 2:1 resonant exoplanetary system orbiting HD73526

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

Comments: To appear in The Astrophysical Journal

We report the detection of a second exoplanet orbiting the G6V dwarf HD73526. This second planet has an orbital period of 377 d, putting it in a 2:1 resonance with the previously known exoplanet, the orbital period for which is updated to 188d. Dynamical modeling of the combined system allows solution for a self-consistent set of orbital elements for both components. HD73526 is the fourth exoplanetary system (of a total of 18 systems with 2 or more components currently known) to have components detected in 2:1 resonance. Finding such a large fraction of multiple planets (more than 20 per cent) in 2:1 resonance strongly suggests that orbital migration, halted by stabilisation in a trapping resonance, plays an important role in the evolution of exoplanets in multiple planet systems.

http://arxiv.org/abs/astro-ph/0602557