Felipe I. Rojas, Rafael Brahm, Andrés Jordán, Néstor Espinoza, Thomas Henning, Jan Eberhardt, Melissa J. Hobson, Martin Schlecker, Marcelo Tala Pinto, Trifon Trifonov, Lyu Abe, Gaspar Bakos, Mauro Barbieri, Khalid Barkaoui, Christopher J. Burke, R. Paul Butler, Ilaria Carleo, Karen A. Collins, Jeffrey D. Crane, Zoltan Csubry, Phil Evans, Tristan Guillot, Chelsea X. Huang, Jon M. Jenkins, Matias I. Jones, Diana Kossakowski, David W. Latham, Andrew W. Mann, Djamel Mékarnia, Maximiliano Moyano, Sangeetha Nandakumar, Hugh P. Osborn, George Ricker, David Rodriguez, Paula Sarkis, Richard P. Schwarz, Sara Seager, Ramotholo Sefako, Stephen Shectman, Gregor Srdoc, Stephanie Striegel, Vincent Suc, Johanna Teske, Ian Thompson, Pascal Torres-Miranda, Roland Vanderspek, José Vines, Sharon X. Wang, Joshua N. Winn, Carl Ziegler

Context. Characterization of warm giants is crucial to constrain giant planet formation and evolution. Measuring the mass and radius of these planets, combined with their moderated irradiation, allows us to estimate their planetary bulk composition, which is a key quantity to comprehend giant planet formation and structure. Aims. We present the discovery of two transiting warm giant planets orbiting solar-type stars from the Transiting Exoplanet Survey Satellite (TESS), which were characterized by further spectroscopic and photometric ground-based observations. Methods. We performed a joint analysis of photometric data with radial velocities to confirm and characterize TOI-883 b and TOI-899 b, two sub-Saturns orbiting solar-like stars. Results. TOI-883 b and TOI-899 b have masses of $0.123 \pm 0.012$ $M_J$ and $0.213 \pm 0.024$ $M_J$, radius of $0.604 \pm 0.028$ $R_J$ and $0.991 \pm 0.044$ $R_J$, periods of $10.06$ d and $12.85$ d and equilibrium temperature of $1086 \pm 19$ K and $1040 \pm 19$ K, respectively. Conclusions. While having similar masses, orbital periods and stellar host properties, these planets seem to have different internal compositions, which could point to distinct formation histories. Both planets are suitable targets for atmospheric studies to further constrain formation scenarios of planets in the Neptune-Saturn mass range