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.
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机译：我们报告发现第二颗系外行星绕G6 V矮人HD 73526旋转。第二颗行星的轨道周期为377天，使其与先前已知的系外行星发生2π：？1共振，其轨道周期已更新到188天。组合系统的动态建模可为两个组件的一组自洽的轨道元素提供解决方案。 HD 73526是第四个系外行星系统（在总共18个系统中，目前已知具有两个或多个组件），其组件被检测为2π：？1共振。在2？：？1共振中发现了如此多的行星（超过20％），这强烈表明，轨道诱捕在稳定中阻止了共振，在多行星系统中系外行星的演变中起着重要作用。
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