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We report the discovery of two exoplanets orbiting around HD 212729(TOI\,1052, TIC 317060587), a $T_{\rm eff}=6146$K star with V=9.51 observed byTESS in Sectors 1 and 13. One exoplanet, TOI-1052b, is Neptune-mass andtransits the star, and an additional planet TOI-1052c is observed in radialvelocities but not seen to transit. We confirm the planetary nature ofTOI-1052b using precise radial velocity observations from HARPS and determinedits parameters in a joint RV and photometry analysis. TOI-1052b has a radius of$2.87^{+0.29}_{-0.24}$ R$_{\oplus}$, a mass of $16.9\pm 1.7$ M$_{\oplus}$, andan orbital period of 9.14 days. TOI-1052c does not show any transits in theTESS data, and has a minimum mass of $34.3^{+4.1}_{-3.7}$ M$_{\oplus}$ and anorbital period of 35.8 days, placing it just interior to the 4:1 mean motionresonance. Both planets are best fit by relatively high but only marginallysignificant eccentricities of $0.18^{+0.09}_{-0.07}$ for planet b and$0.24^{+0.09}_{-0.08}$ for planet c. We perform a dynamical analysis andinternal structure model of the planets as well as deriving stellar parametersand chemical abundances. The mean density of TOI-1052b is $3.9^{+1.7}_{-1.3}$ gcm$^{-3}$ consistent with an internal structure similar to Neptune. A nearbystar is observed in Gaia DR3 with the same distance and proper motion asTOI-1052, at a sky projected separation of ~1500AU, making this a potentialwide binary star system.

Discovery and characterisation of two Neptune-mass planets orbiting HD 212729 with TESS