We report the detection and characterization of the new transiting extrasolar planet TOI-1710 b. It was first identified as a promising candidate by the Transiting Exoplanet Survey Satellite (TESS). Its planetary nature has been established from HARPS-N and SOPHIE spectroscopic observations via the radial velocity method. The stellar parameters for the host star are derived from the spectra and a joint Markov chain Monte-Carlo (MCMC) adjustment of the spectral energy distribution and evolutionary tracks of TOI-1710. Performed in a combined MCMC and quasi-periodic Gaussian process method, a simultaneous analysis of the TESS light curve and the radial velocity evolution concomitantly allows us to determine the planetary properties and inspect the stellar magnetic activity jitter. TOI-1710 b is a massive warm Neptune (30.0 ± 5.7 M_Earth and 5.84 ± 0.30 R_Earth) orbiting a G5V dwarf star on a 24.3 days circular compatible orbit (e = 0.13 ± 0.09).

{"references": ["Foreman-Mackey, Daniel, et al. (2017). Exoplanet Python Package associated to DOI:10.3847/1538-3881/aa9332"]}

König, Pierre-Cécil, et al., A&A, in prep.