Poster Open Access

The key role of the host star's rotational history on the evolution of the planetary system - The case of TOI-849 and Kepler-444

Pezzotti, Camilla

Buldgen, Gaƫl; Attia, Omar; Bourrier, Vincent; Mordasini, Christoph
Eggenberger, Patrick; Meynet, Georges

The interaction between the host star and planets has a significant

role in shaping the evolution of the planetary system. The dissipation of

tides and the consequent exchange of angular momentum between star and

planets may significantly impact their orbits and modify the architecture of

the system. The emission of high-energy stellar radiation is directly linked

to the stellar rotation rate and its role in determining the efficiency of

planetary atmospheric evaporation represents a key process suitable to

explain some peculiar features observed in the population of detected

exoplanets. In this context, the rotational history of the host star plays a

key role. In our work, we aim at having an as detailed as possible

characterisation of the host star of the system provided by thorough

asteroseismic modelling (when available). Rotating models of the host star

are then computed by accounting for a comprehensive treatment of angular

momentum transport by hydrodynamic and magnetic instabilities. We explore a

range of initial surface rotation rates representative of slow, medium and

fast rotators, accounting for the degeneracy on the stellar rotational

history. We finally study the interaction between star and planet, by

coupling the host star model to our orbital evolution code, simultaneously

following the impact of tides and atmospheric evaporation. We present recent

results found in the context of the TOI-849 and Kepler-444 systems.

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