TOI-1743 b, TOI-5799 b, TOI-5799 c, and TOI-6223 b: TESS discovery and validation of four super-Earth to Neptune-sized planets around M dwarfs

We present the discovery by the TESS mission of one transiting Neptune-sized planet, TOI-6223 b, and two transiting super-Earths, TOI-1743 b and TOI-5799 b. We validate these planets using a statistical validation method, multi-color light curves, and other ancillary observations. We combined TESS and ground-based photometric data to constrain the physical properties of the planets. TOI-6223 b is slightly larger than Neptune R p = 5.12 −0.25 +0.24 R ⊕ ) orbiting an early M dwarf in 3.86 days, and it has an equilibrium temperature of T eq = 714 ± 14 K. TOI-1743 b orbits its mid-dwarf star every 4.27 days. It has a radius of R p = 1.83 −0.10 +0.11 R ⊕ and an equilibrium temperature of T eq = 485 −13 +14 . TOI-5799 b has a radius of R p = 1.733 −0.090 +0.096 R ⊕ and an equilibrium temperature of T eq = 505 ± 16 K. It orbit around an M2 dwarf in 4.17 days. We also present the discovery of an additional transiting planet, TOI-5799 c, which we identified in the TESS data and validated using the SHERLOCK pipeline. TOI-5799 c is a super-Earth with a radius of R p = 1.76 −0.10 +0.11 R ⊕ . Its orbital period and its equilibrium temperature are 14.01 days and T eq = 337 ± 11 K, respectively, which place it near the inner edge of the habitable zone of its star. We show that these planets are suitable for both radial velocity follow-up and atmospheric characterization. They orbit bright (<11 K mag ) early M dwarfs, making them accessible for precise mass measurements. The combination of the planet sizes and stellar brightness of their host stars also make them suitable targets for atmospheric exploration with the JWST. Such studies may provide insights into planet formation and evolution, as TOI-1743 b, TOI-5799 b, and TOI-5799 c lie within what is known as the radius valley, while TOI-6223 b is located on the Neptunian ridge in the period-radius plane.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2025-09-22
DOI
https://doi.org/10.1051/0004-6361/202556293
Citations
1
Primary Topic
Atmospheric Ozone and Climate
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article
Field-Weighted Citation Impact
1.30
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TOI-1743 b, TOI-5799 b, TOI-5799 c, and TOI-6223 b: TESS discovery and validation of four super-Earth to Neptune-sized planets around M dwarfs

M. Ghachoui, Éric Girardin, A. Bieryla, B. V. Rackham et al.
1 citations
Astronomy and Astrophysics
Atmospheric Ozone and Climate
1.30
article

TOI-1743 b, TOI-5799 b, TOI-5799 c, and TOI-6223 b: TESS discovery and validation of four super-Earth to Neptune-sized planets around M dwarfs

M. Ghachoui, Éric Girardin, A. Bieryla, B. V. Rackham, Marziye Jafariyazani, B. -O. Demory, Julien de Wit, D.R. Ciardi, J. Brande, J.M. Jenkins, Kiyoe Kawauchi, Z. Benkhaldoun, U. Schroffenegger, F. Murgas, K. Barkaoui, Ε. Πάλλη, Y. Kawai, D. Queloz, Sebastián Zúñiga-Fernández, I. A. Strakhov, M. Gillon, A. Shporer, Akanksha Khandelwal, C. Ziegler, G. Lacedelli, Artem Burdanov, Y. Gómez Maqueo Chew, Mathilde Timmermans, Akimasa Fukui, Priyashkumar Mistry, Kai Ikuta, Fatma Akar, Pauli Pedersen, M. Lendl, I. Plauchu–Frayn, A. Soubkiou, Emma Softich, Norio Narita, Elsa Ducrot, D.W. Latham, Özgür Baştürk, A. Peláez-Torres, Gareb Fernández-Rodríguez, S. Sohy, E. Jehin, K. Isogai, Giuseppe Morello, Francis Zong Lang, Gregor Srdoč, S. Yalç
article en
1 citations

Abstract

We present the discovery by the TESS mission of one transiting Neptune-sized planet, TOI-6223 b, and two transiting super-Earths, TOI-1743 b and TOI-5799 b. We validate these planets using a statistical validation method, multi-color light curves, and other ancillary observations. We combined TESS and ground-based photometric data to constrain the physical properties of the planets. TOI-6223 b is slightly larger than Neptune R p = 5.12 −0.25 +0.24 R ⊕ ) orbiting an early M dwarf in 3.86 days, and it has an equilibrium temperature of T eq = 714 ± 14 K. TOI-1743 b orbits its mid-dwarf star every 4.27 days. It has a radius of R p = 1.83 −0.10 +0.11 R ⊕ and an equilibrium temperature of T eq = 485 −13 +14 . TOI-5799 b has a radius of R p = 1.733 −0.090 +0.096 R ⊕ and an equilibrium temperature of T eq = 505 ± 16 K. It orbit around an M2 dwarf in 4.17 days. We also present the discovery of an additional transiting planet, TOI-5799 c, which we identified in the TESS data and validated using the SHERLOCK pipeline. TOI-5799 c is a super-Earth with a radius of R p = 1.76 −0.10 +0.11 R ⊕ . Its orbital period and its equilibrium temperature are 14.01 days and T eq = 337 ± 11 K, respectively, which place it near the inner edge of the habitable zone of its star. We show that these planets are suitable for both radial velocity follow-up and atmospheric characterization. They orbit bright (<11 K mag ) early M dwarfs, making them accessible for precise mass measurements. The combination of the planet sizes and stellar brightness of their host stars also make them suitable targets for atmospheric exploration with the JWST. Such studies may provide insights into planet formation and evolution, as TOI-1743 b, TOI-5799 b, and TOI-5799 c lie within what is known as the radius valley, while TOI-6223 b is located on the Neptunian ridge in the period-radius plane.

Astronomy and AstrophysicsVol. 702
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Atmospheric Ozone and Climate
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