PLATOSpec first results: Three new transiting warm Jupiters from the WINE survey, TIC 147027702, TIC 245076932, and TIC 87422071

¹ Astronomical Institute, Czech Academy of Sciences, Fričova 298, 25165 Ondřejov, Czech Republic
² Institute of Physics, Faculty of Science, Pavol Jozef Šafárik University, Park Angelinum 9, 04001 Košice, Slovakia
³ Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal Las Torres 2640, Peñalolén, Santiago, Chile
⁴ Millennium Institute for Astrophysics, Av. Vicuna Mackenna 4860, 782-0436 Macul, Santiago, Chile
⁵ Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
⁶ European Southern Observatory (ESO), Alonso de Córdova 3107, Vitacura, Casilla 19001, Santiago, Chile
⁷ Astronomical Institute of Charles University, V Holešovičkách 2, 180 00 Prague, Czech Republic
⁸ Department of Theoretical Physics and Astrophysics, Faculty of Science, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
⁹ Université Côte d’Azur, Observatoire de la Côte d’Azur, CNRS, Laboratoire Lagrange, CS 34229, 06304 Nice Cedex 4, France
¹⁰ Istituto di Scienze Polari del CNR (ISP-CNR), Università Ca’ Foscari, Via Torino n. 155, 30172 Venezia Mestre (VE), Italy
¹¹ Programma Nazionale di Ricerche in Antartide (PNRA), Institut polaire français Paul-Émile Victor (IPEV)
¹² School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
¹³ Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
¹⁴ Instituto de Astrofísica de Canarias (IAC), Calle Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
¹⁵ Astrobiology Research Unit, Université de Liège, 19C Allée du 6 Août, 4000 Liège, Belgium
¹⁶ Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
¹⁷ El Sauce Observatory – Obstech, Coquimbo, Chile
¹⁸ Cavendish Laboratory, J. J. Thomson Avenue, Cambridge, CB3 0HE, UK
¹⁹ Center of Astro Engineering, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-043 Santiago, Chile
²⁰ Department of Electrical Engineering, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-043 Santiago, Chile
²¹ Thüringer Landessternwarte, 07778 Tautenburg, Germany
²² Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA
²³ Department of Physics and Astronomy, The University of New Mexico, Albuquerque, NM 87106, USA
²⁴ Institute of Plasma Physics of the Czech Academy of Sciences, Research Centre for Special Optics and Optoelectronic Systems TOPTEC, U Slovanky 2525/1a, 182 00 Praha 8, Czech Republic
²⁵ Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 7820436 Macul, Santiago, Chile

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Received: 19 December 2025
Accepted: 25 February 2026

Abstract

We report the discovery and characterisation of three transiting warm Jupiters: TIC 147027702b, TIC 245076932b, and TIC 87422071b. These systems were initially identified as transiting candidates using light curves generated from the full-frame images of the TESS mission. We confirmed the planetary nature of these objects with ground-based spectroscopic follow-up observations using FEROS and the new PLATOSpec spectrograph attached to the ESO 1.52 m telescope at the La Silla Observatory, and with ground-based photometric observations of the Observatoire Moana, Las Cumbres Observatory Global Telescope and ASTEP. From a global fit to the photometry and radial velocities, we determine that the planet TIC 147027702b has a low-eccentricity orbit (e = 0.13 ± 0.05) with a period of 44.4 days, a mass of 1.09_−0.13^+0.07 M_J, and a radius of 0.98 ± 0.06 R_J. TIC 245076932b has a moderately low mass of 0.51 ± 0.05 M_J, a radius of 0.97 ± 0.05 R_J, and an eccentric orbit (e = 0.43 ± 0.02) with a period of 21.6 days. TIC 87422071b has a mass of 1.29 ± 0.10 M_J, a radius of 0.97 ± 0.08 R_J, and a slightly eccentric orbit (e = 0.12 ± 0.07) with a period of 11.3 days. These well-characterised warm Jupiters expand the currently limited sample of similar gas giants and provide valuable benchmarks for testing models of giant-planet formation, migration, and tidal evolution.