Stable chaos in the 55Cnc exoplanetary system?
Julie Gayon, Francesco Marzari, Hans Scholl
TL;DR
This study investigates the stability of the 55 Cnc exoplanetary system, revealing that despite high chaos indicators, the system remains stable over hundreds of millions of years.
Contribution
It demonstrates that a significant fraction of possible orbital configurations exhibit stable chaos, combining chaos indicators with long-term stability analysis.
Findings
15% of possible configurations are highly chaotic
The system remains stable over 400 million years
Close planetary encounters are avoided despite chaos
Abstract
The five planets discovered around the main-sequence star 55 Cnc may represent a case of stable chaos. By using both the Frequency Map Analysis and MEGNO we find that about 15 % of the systems that can be build from the nominal orbital elements of the system are highly chaotic. However, in spite of the fast diffusion rate in the phase space, the planetary system is not destabilized over 400 Myr and close encounters between the planets are avoided.
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