Three warm Jupiters orbiting TOI-6628, TOI-3837, and TOI-5027 and one sub-Saturn orbiting TOI-2328^★

¹ Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile
² Millennium Institute for Astrophysics, Santiago, Chile
³ Data Observatory Foundation, Santiago, Chile
⁴ El Sauce Observatory – Obstech, Coquimbo, Chile
⁵ Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
⁶ European Southern Observatory (ESO), Avenida Alonso de Córdova 3107, Vitacura, Santiago, Chile
⁷ Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
⁸ Observatoire de Genève, Département d’Astronomie, Université de Genève, Chemin Pegasi 51b, 1290 Versoix, Switzerland
⁹ Instituto de Astrofísica, Facultad de Física, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, Santiago, Chile
¹⁰ Department of Astronomy/Steward Observatory, The University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA
¹¹ Landessternwarte, Zentrum für Astronomie der Universtät Heidelberg, Königstuhl 12, 69117 Heidelberg, Germany
¹² Department of Astronomy, Sofia University St Kliment Ohridski, 5 James Bourchier Blvd, 1164 Sofia, Bulgaria
¹³ Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544, USA
¹⁴ Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK
¹⁵ Department of Physics, Cornell University, Ithaca, NY, USA
¹⁶ Carnegie Institution for Science, Earth & Planets Laboratory, 5241 Broad Branch Road NW, Washington, DC 20015, U.S.A.
¹⁷ The Observatories of the Carnegie Institution for Science, 813 Santa Barbara Street, Pasadena, CA 91101, USA
¹⁸ Las Campanas Observatory, Carnegie Institution of Washington, Colina el Pino, Casilla 601 La Serena, Chile
¹⁹ Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
²⁰ Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
²¹ Hazelwood Observatory, RMB 4036 Matta Drive, Hazelwood South, Victoria 3840, Australia
²² Department of Physics & Astronomy, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218, USA
²³ Società Astronomica Lunae, Castelnuovo Magra, Italy
²⁴ Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
²⁵ Department of Aeronautics and Astronautics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
²⁶ NASA Ames Research Center, Moffett Field, CA 94035, USA
²⁷ Department of Astronomy, Yale University, 219 Prospect Street, New Haven, CT 06511, USA
²⁸ Department of Physics and Astronomy, The University of New Mexico, 210 Yale Blvd NE, Albuquerque, NM 87106, USA

^★★ Corresponding author; marcelo.tala@edu.uai.cl

Received: 7 October 2024
Accepted: 3 January 2025

Abstract

We report the discovery and characterization of three new transiting giant planets orbiting TOI-6628, TOI-3837, and TOI-5027 and one new warm sub-Saturn orbiting TOI-2328, whose transits events were detected in the light curves of the Transiting Exoplanet Survey Satellite (TESS) space mission. By combining TESS light curves with ground-based photometric and spectroscopic followup observations, we confirm the planetary nature of the observed transits and radial velocity variations. TOI-6628 b has a mass of 0.74±0.06 M_J and a radius of 0.98_−0.05^+0.06 R_J and orbits a metal-rich star with a period of 18.18424 ± 0.00001 days and an eccentricity of 0.670_−0.016^+0.015, making it one of the most eccentric orbits of all known warm giants. TOI-3837 b has a mass of 0.59±0.05 M_J and a radius of 0.97_−0.06^+0.05 R_J and orbits its host star every 11.88865 ± 0.00003 days, with a moderate eccentricity of 0.221_−0.046^+0.042. With a mass of 2.02±0.13 M_J and a radius of 0.96_−0.06^+0.05 R_J, TOI-5027 b orbits its host star in an eccentric orbit with e = 0.385_−0.026^+0.025 every 10.24368±0.00001 days. TOI-2328 b is a Saturn-like planet with a mass of 0.16±0.02 M_J and a radius of 0.89_−0.05^+0.04 R_J; it orbits its host star in a nearly circular orbit with e = 0.057_−0.029^+0.046 at a period of 17.10197±0.00001 days. All four planets have orbital periods above ten days, and our planet’s interior structure models are consistent with a rocky-icy core with an H/He envelope, providing evidence supporting the core-accretion model of planet formation for this kind of planet.