TESS discovery of a sub-Neptune orbiting a mid-M dwarf TOI-2136

Tianjun Gan, Abderahmane Soubkiou, Sharon X. Wang, Zouhair Benkhaldoun, Shude Mao, Étienne Artigau, Pascal Fouqué, Steven Giacalone, Christopher A. Theissen, Christian Aganze, Karen A. Collins, Avi Shporer, Khalid Barkaoui, Mourad Ghachoui, Steve B. Howell, Claire Lamman, Olivier D. S. Demangeon, Artem Burdanov, Charles Cadieux, Jamila ChouqarKevin I. Collins, Neil J. Cook, Laetitia Delrez, Brice-Olivier Demory, René Doyon, Georgina Dransfield, Courtney D. Dressing, Elsa Ducrot, Jiahao Fan, Lionel Garcia, Holden Gill, Michaël Gillon, Crystal L. Gnilka, Yilen Gómez Maqueo Chew, Maximilian N. Günther, Christopher E. Henze, Chelsea X. Huang, Emmanuel Jehin, Eric L. N. Jensen, Zitao Lin, James McCormac, Catriona A. Murray, Prajwal Niraula, Peter P. Pedersen, Francisco J. Pozuelos, Didier Queloz, Benjamin V. Rackham, Arjun B. Savel, Nicole Schanche, Richard P. Schwarz, Daniel Sebastian, Samantha Thompson, Mathilde Timmermans, Amaury H. M. J. Triaud, Michael Vezie, Robert D. Wells, Julien de Wit, George R. Ricker, Roland Vanderspek, David W. Latham, Sara Seager, Joshua N. Winn, Jon M. Jenkins

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We present the discovery of TOI-2136 b, a sub-Neptune planet transiting a nearby M4.5V-type star every 7.85 d, identified through photometric measurements from the Transiting Exoplanet Survey Satellite (TESS) mission. The host star is located 33 pc away with a radius of R* = 0.34 ± 0.02 R, a mass of 0.34±0.02M⁠, and an effective temperature of 3342 ± 100 K. We estimate its stellar rotation period to be 75 ± 5 d based on archival long-term photometry. We confirm and characterize the planet based on a series of ground-based multiwavelength photometry, high-angular-resolution imaging observations, and precise radial velocities from Canada–France–Hawaii Telescope (CFHT)/SpectroPolarimètre InfraROUge (SPIRou). Our joint analysis reveals that the planet has a radius of 2.20 ± 0.17 R and a mass of 6.4 ± 2.4 M. The mass and radius of TOI-2136 b are consistent with a broad range of compositions, from water-ice to gas-dominated worlds. TOI-2136 b falls close to the radius valley for M dwarfs predicted by thermally driven atmospheric mass-loss models, making it an interesting target for future studies of its interior structure and atmospheric properties.
Original languageEnglish
Pages (from-to)4120–4139
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
Early online date30 May 2022
Publication statusPublished - Aug 2022

Bibliographical note

19 pages, 15 figures, submitted to MNRAS


  • TOI-2136
  • astro-ph.EP
  • astro-ph.SR
  • planetary systems.
  • planets and satellites: detection
  • stars: individual: TIC 336128819


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