Poster
N. A. M. Moedas, R. A. Garcia, D. Bossini, M. Deal, O. Demangeon
Abstract
Using TESS data, we revisited the full properties of 94 Ceti, a system of three stars.
The system is composed of a main component, a naked-eye F-type star, orbited by two M
dwarfs that, in turn, orbit each other. The main component also hosts an exoplanet. The study of
this system has the potential of being a testing ground for a better understanding of the
chemical evolution in planet-host F-type stars. The importance of chemical transport
mechanisms in modelling the F-type star is the key to derive accurate fundamental parameters
for all system components. We show the influence and efficiency of considering turbulent mixing
and radiative accelerations treatments in the stellar models, which we have recently
implemented in MESA. The new updated fundamental properties of the main component will
also provide a new age for the M dwarfs, allowing them to be used as benchmarks. Finally, the
binary relations inside of the system, derived by Gaia observations, will make possible an
independent measurement of the masses of all the stellar components. In this study, we have
extracted new seismic constraints from the TESS light curves of the F-type star. This allows us
to update its fundamental properties which differ from the previous determinations of about 4%
in mass, and 15% in age. The properties of the exoplanet are thus improved, showing a 7%
difference in the mass compared to previous estimates.
8th TESS/15th Kepler Asteroseismic Science Consortium Workshop
Porto, Portugal
2024 July
