Presentation Open Access

Spacing and stability of compact systems

Antoine Petit

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    <subfield code="a">&lt;p&gt;Exoplanet transit surveys have revealed the existence of numerous&lt;br&gt;
multi-planetary systems packed close to their stability limit. This feature&lt;br&gt;
likely emerges from the formation and dynamical history of the system.&lt;br&gt;
Understanding it in detail is thus key to constrain our planet formation&lt;br&gt;
scenarios. While the stability limit has been known empirically for decades,&lt;br&gt;
no theoretical explanation was proposed yet. I present a mechanism driving&lt;br&gt;
the instability of tightly packed system. Based on the chaotic diffusion&lt;br&gt;
along the network of three-planet resonances, it reproduces quantitatively&lt;br&gt;
the timescale of instability obtained numerically over several order of&lt;br&gt;
magnitude in time and planet-to-star mass ratios. I discuss the observational&lt;br&gt;
implications of this model, in particular the expected differences between&lt;br&gt;
Super-Earths and terrestrial planet systems.&lt;/p&gt;</subfield>
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