Fundamental parameters of 18 hot stars in the Ariel mission candidate sample

The characterisation of exoplanetary systems depends on the accurate determination of host star parameters. The Ariel
mission will probe the atmospheres of a statistically significant sample of exoplanets, and so requires a precise characterisation of
the stellar properties well before its launch in 2029. The homogeneous determination of stellar parameters for Ariel will enable both
the optimisation of the final target list and set roots for a reliable interpretation of the formation and evolution of planetary systems.
Such a homogeneous characterisation has thus far only been carried out for the cool (Teff ≲ 7000 K) host stars among the Ariel target
candidates.We present a uniform determination of fundamental stellar parameters for 18 hot stars ( Teff ≳ 7000 K) in the Tier 1 candidate
list of the Ariel mission candidate sample. The derived parameters provide an consistent basis for studying the link between stellar properties and
planetary characteristics in intermediate-mass stars (1.5 < M < 2.32 M⊙). Building on our previous work on FGK host stars, we show
that correlations between stellar mass, metallicity, and planetary radii also extend to early-type stars, and stellar properties influence
the architecture of multi-planet systems.