TOI-1846 b: a super-Earth in the radius valley orbiting a nearby M dwarf

Soubkiou, A.; Barkaoui, K.; Benkhaldoun, Z.; Ghachoui, M.; Chouqar, J.; V, R.B.; Burgasser, A.; Softich, E.; Pallé, E.; Fukui, A.; Narita, N.; Murgas, F.; Howell, S.B.; Clark, C.A.; Littlefield, C.; Bieryla, A.; Boyle, A.W.; Ciardi, D.; Collins, K.; I, C.K.; de Leon, J.; Dressing, C.D.; Eastman, J.; Esparza-Borges, E.; Giacalone, S.; Gill, H.; Gillon, M.; Ikuta, K.; Jenkins, J.M.; Kagetani, T.; Latham, D.W.; Mori, M.; Parviainen, H.; Pass, E.; Ricker, G.; Safonov, B.S.; Savel, A.B.; Schwarz, R.P.; Seager, S.; Strakhov, I.A.; Srdoc, G.; Vanderspek, R.; Watanabe, N.; N, W.C.; Winn, J.

Авторы: Soubkiou Abderahmane, Barkaoui Khalid, Benkhaldoun Zouhair, Ghachoui Mourad, Chouqar Jamila, V Rackham Benjamin, Burgasser Adam, Softich Emma, Pallé Enric, Fukui Akihiko, Narita Norio, Murgas Felipe, Howell Steve B., Clark Catherine A., Littlefield Colin, Bieryla Allyson, Boyle Andrew W., Ciardi David, Collins Karen, I Collins Kevin, de Leon Jerome, Dressing Courtney D., Eastman Jason, Esparza-Borges Emma, Giacalone Steven, Gill Holden, Gillon Michaël, Ikuta Kai, Jenkins J.M., Kagetani Taiki, Latham David W., Mori Mayuko, Parviainen Hannu, Pass Emily, Ricker G., Safonov Boris S., Savel Arjun B., Schwarz Richard P., Seager Sara, Strakhov Ivan A., Srdoc Gregor, Vanderspek R., Watanabe Noriharu, N Watkins Cristilyn, Winn J.
Журнал: Monthly Notices of the Royal Astronomical Society
Том: 541
Номер: 4
Год издания: 2025
Издательство: Oxford Journals, Oxford University Press
Местоположение издательства: Oxford, UK, England
Первая страница: 3249
Последняя страница: 3268
DOI: 10.1093/mnras/staf1030
Аннотация: We present the discovery and validation of a super-Earth planet orbiting the M dwarf star TOI-1846 (TIC 198385543). The host star (Kmag=9.6) is located 47 pc away and has a radius of R⋆=0.41±0.01R⊙, a mass of M⋆=0.40±0.02M⊙ and an effective temperature of Teff=3568±44 K. Our analyses are based on joint modelling of Transiting Exoplanet Survey Satellite (TESS) photometry and ground-based multicolour photometric data. We also use high-resolution imaging and archival images, as well as statistical validation techniques to support the planetary system nature. We find that TOI-1846 b is a super-Earth sized planet with radius of Rp=1.79±0.07R⊕ and a predicted mass of Mp=4.4+1.6−1.0M⊕ (from the Chen & Kipping relation) on a 3.9 d orbit, with an equilibrium temperature of Teq =589±20K (assuming a null Bond Albedo) and an incident flux of Sp=17.6±2.0 S⊕. Based on the two radial velocity (RV) measurements obtained with the Tillinghast Reflector Echelle Spectrograph and high-resolution imaging, a non-planetary transiting companion is excluded. With a radius of ≈1.8 R⊕, TOI-1846 b is within the sparsely populated radius range around 2 R⊕ known as the radius gap (or radius valley). This discovery can contribute to refining the precise location of the radius valley for small planets orbiting bright M dwarfs, thereby enhancing our understanding of planetary formation and evolution processes.
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