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 Fouque, Luc Arnold, Steven Giacalone, Christopher A. Theissen, Christian Aganze, Adam Burgasser, Karen A. Collins, Avi Shporer, Khalid Barkaoui, Mourad Ghachoui, Steve B. Howell, Claire Lamman, Olivier D.S. Demangeon, Artem BurdanovCharles Cadieux, Jamila Chouqar, Kevin I. Collins, Neil J. Cook, Laetitia Delrez, Brice Olivier Demory, Rene 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, Nadine Manset, 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

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We present the disco v ery 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 . 02 M , and an ef fecti ve temperature of 3342 ±100 K. We estimate its stellar rotation period to be 75 ±5 d based on archi v al 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)/SpectroPolarimetre 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 (US)
Pages (from-to)4120-4139
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Issue number3
StatePublished - Aug 1 2022

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • planetary systems
  • planets and satellites: detection
  • stars: individual: TIC 336128819-TOI-2136


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