Star-planet tidal interaction and stellar rotational evolution
Intervenant : Florian Gallet
The surface angular velocity evolution of low-mass stars is now globally understood and the main physical mechanisms involved in it are observationally quite constrained. However, recent observations showed anomalies in the rotational period distribution of open clusters main sequence early K-type stars that cannot be reproduced by current angular momentum evolution model. By using a parametric model that merged an angular momentum evolution code with an orbital evolution code that takes into account the torque due to the tides raised on the star by the planet, I investigated the impact of star-planet tidal interaction on the evolution of rotational distribution of star-planet systems. I explored different stellar and planetary configurations (stellar mass from 0.5 to 1.0 Msun and planetary mass from 10 Mearth to 13 Mjup) to study their impact on the planetary orbital and stellar rotational evolution. I showed that star-planet tidal interactions can create a kink in the rotational period distribution of low-mass stars, which could possibly account for unexpected scatter seen in the rotational period distribution of young stellar clusters. Eventually, I also developed a new age determination technique, named the tidal-chronology, base on the interplayed evolution of the stellar rotation and the planetary semi-major axis.
(Credit Image: MPS / Mark A. Garlick)