TOI-3568 b: A super-Neptune in the sub-Jovian desert

• Autores: Martioli, E.; Petrucci, R. P.; Jofre, Jorge Emiliano; Hébrard, G.; Ghezzi, L.; Gómez Maqueo Chew, Y.; Díaz, Rodrigo Fernando; Perottoni, H. D.; Garcia, L. H.; Rapetti, D.; Lecavelier des Etangs, A.; de Almeida, L.; Arnold, L.; Artigau, É.; Basant, R.; Bean, J. L.; Bieryla, A.; Boisse, I.; Bonfils, X.; Brady, M.; Cadieux, C.; Carmona, A.; Cook, N. J.; Delfosse, X.; Pritchard, T. A.; Rowden, P.; Seifahrt, A.; Stefánsson, G.; Stürmer, J.; Twicken, J. D.
• Año de publicación: 2024
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: EXOPLANET; TOI-3568; SPECTROSCOPY; TRANSIT
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

The sub-Jovian desert is a region in the mass-period and radius-period parameter space that typically encompasses short-period ranges between super-Earths and hot Jupiters, and exhibits an intrinsic dearth of planets. This scarcity is likely shaped by photoevaporation caused by the stellar irradiation received by giant planets that have migrated inward. We report the detection and characterization of TOI-3568 b, a transiting super-Neptune with a mass of 26.4 ± 1.0 M⊕, a radius of 5.30 ± 0.27 R⊕, a bulk density of 0.98 ± 0.15 g cm−3, and an orbital period of 4.417965 (5) d situated in the vicinity of the sub-Jovian desert. This planet orbiting a K dwarf star with solar metallicity was identified photometrically by the Transiting Exoplanet Survey Satellite (TESS). It was characterized as a planet by our high-precision radial-velocity (RV) monitoring program using MAROON-X at Gemini North, supplemented with additional observations from the SPICE large program with SPIRou at CFHT. We performed a Bayesian MCMC joint analysis of the TESS and ground-based photometry, and MAROON-X and SPIRou RVs, to measure the orbit, radius, and mass of the planet, as well as a detailed analysis of the high-resolution flux and polarimetric spectra to determine the physical parameters and elemental abundances of the host star. Our results reveal TOI-3568 b to be a hot super-Neptune rich in hydrogen and helium, with a core of heavier elements of between 10 and 25 M⊕ in mass. We analyzed the photoevaporation status of TOI-3568 b and find that it experiences one of the highest extreme-ultraviolet (EUV) luminosities among planets with a mass of Mp < 2 MNep, yet it has an evaporation lifetime exceeding 5 Gyr. Positioned in the transition between two significant populations of exoplanets on the mass-period and energy diagrams, this planet presents an opportunity to test theories concerning the origin of the sub-Jovian desert.
Fil: Martioli, E.. Laboratório Nacional de Astrofísica; Brasil. Centre National de la Recherche Scientifique; Francia. Sorbonne University; Francia
Fil: Petrucci, R. P.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Jofre, Jorge Emiliano. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba; Argentina
Fil: Hébrard, G.. Sorbonne University; Francia. Observatoire de Haute Provence; Francia
Fil: Ghezzi, L.. Universidade Federal do Rio de Janeiro; Brasil
Fil: Gómez Maqueo Chew, Y.. Universidad Nacional Autónoma de México; México
Fil: Díaz, Rodrigo Fernando. Universidad Nacional de San Martín. Escuela de Ciencia y Tecnología. Centro Internacional de Estudios Avanzados; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Instituto de Ciencias Físicas. - Universidad Nacional de San Martín. Instituto de Ciencias Físicas; Argentina
Fil: Perottoni, H. D.. Laboratório Nacional de Astrofísica; Brasil
Fil: Garcia, L. H.. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba; Argentina
Fil: Rapetti, D.. National Aeronautics and Space Administration; Estados Unidos
Fil: Lecavelier des Etangs, A.. Sorbonne University; Francia
Fil: de Almeida, L.. Laboratorio Nacional de Astrofisica; Brasil
Fil: Arnold, L.. Centre National de la Recherche Scientifique; Francia. Canada-France-Hawaii Telescope; Estados Unidos
Fil: Artigau, É.. University of Montreal; Canadá
Fil: Basant, R.. University of Chicago; Estados Unidos
Fil: Bean, J. L.. University of Chicago; Estados Unidos
Fil: Bieryla, A.. Harvard-Smithsonian Center for Astrophysics; Estados Unidos
Fil: Boisse, I.. Centre National de la Recherche Scientifique; Francia. Aix Marseille Université; Francia
Fil: Bonfils, X.. Universite Grenoble Alpes; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Brady, M.. University of Chicago; Estados Unidos
Fil: Cadieux, C.. University of Montreal; Canadá
Fil: Carmona, A.. Universite Grenoble Alpes; Francia. Centre National de la Recherche Scientifique; Francia
Fil: Cook, N. J.. University of Montreal; Canadá
Fil: Delfosse, X.. Universite Grenoble Alpes; Francia
Fil: Pritchard, T. A.. National Aeronautics and Space Administration; Estados Unidos
Fil: Rowden, P.. Royal Astronomical Society; Reino Unido
Fil: Seifahrt, A.. University of Chicago; Estados Unidos
Fil: Stefánsson, G.. University of Amsterdam; Países Bajos
Fil: Stürmer, J.. Ruprecht Karls Universitat Heidelberg; Alemania
Fil: Twicken, J. D.. National Aeronautics and Space Administration; Estados Unidos. SETI Institute; Estados Unidos