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Long-period transiting planets provide the opportunity to better understandthe formation and evolution of planetary systems. Their atmospheric propertiesremain largely unaltered by tidal or radiative effects of the host star, andtheir orbital arrangement reflects a different, and less extreme, migrationalhistory compared to close-in objects. The sample of long-period exoplanets withwell determined masses and radii is still limited, but a growing number oflong-period objects reveal themselves in the TESS data. Our goal is to vet andconfirm single transit planet candidates detected in the TESS space-basedphotometric data through spectroscopic and photometric follow up observationswith ground-based instruments. We use the Next Generation Transit Survey (NGTS)to photometrically monitor the candidates in order to observe additionaltransits. We report the discovery of two massive, warm Jupiter-size planets,one orbiting the F8-type star TOI-5153 and the other orbiting the G1-type starNGTS-20 (=TOI-5152). From our spectroscopic analysis, both stars are metal-richwith a metallicity of 0.12 and 0.15, respectively. Follow-up radial velocityobservations were carried out with CORALIE, CHIRON, FEROS, and HARPS. TOI-5153hosts a 20.33 day period planet with a planetary mass of 3.26 (+-0.18) Mj, aradius of 1.06 (+-0.04) Rj , and an orbital eccentricity of 0.091 (+-0.026).NGTS-20 b is a 2.98 (+-0.16) Mj planet with a radius of 1.07 (+-0.04) Rj on aneccentric (0.432 +- 0.023) orbit with an orbital period of 54.19 days. Bothplanets are metal-enriched and their heavy element content is in line with thepreviously reported mass-metallicity relation for gas giants. Both warmJupiters orbit moderately bright host stars making these objects valuabletargets for follow-up studies of the planetary atmosphere and measurement ofthe spin-orbit angle of the system.

Two long-period transiting exoplanets on eccentric orbits: NGTS-20 b (TOI-5152 b) and TOI-5153 b