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

Bibcode
2022MNRAS.514.4120G
DOI
10.1093/mnras/stac1448
Gan, Tianjun; Soubkiou, Abderahmane; Wang, Sharon X.; Benkhaldoun, Zouhair; Mao, Shude; Artigau, Étienne; Fouqué, Pascal; Arnold, Luc; Giacalone, Steven; Theissen, Christopher A.; Aganze, Christian; Burgasser, Adam; Collins, Karen A.; Shporer, Avi; Barkaoui, Khalid; Ghachoui, Mourad; Howell, Steve B.; Lamman, Claire; Demangeon, Olivier D. S.; Burdanov, Artem; Cadieux, Charles; Chouqar, Jamila; Collins, Kevin I.; Cook, Neil J.; Delrez, Laetitia; Demory, Brice-Olivier; Doyon, René; Dransfield, Georgina; Dressing, Courtney D.; Ducrot, Elsa; Fan, Jiahao; Garcia, Lionel; Gill, Holden; Gillon, Michaël; Gnilka, Crystal L.; Gómez Maqueo Chew, Yilen; Günther, Maximilian N.; Henze, Christopher E.; Huang, Chelsea X.; Jehin, Emmanuel; Jensen, Eric L. N.; Lin, Zitao; Manset, Nadine; McCormac, James; Murray, Catriona A.; Niraula, Prajwal; Pedersen, Peter P.; Pozuelos, Francisco J.; Queloz, Didier; Rackham, Benjamin V.; Savel, Arjun B.; Schanche, Nicole; Schwarz, Richard P.; Sebastian, Daniel; Thompson, Samantha; Timmermans, Mathilde; Triaud, Amaury H. M. J.; Vezie, Michael; Wells, Robert D.; de Wit, Julien; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society

Advertised on:
8
2022
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
66
IAC number of authors
1
Citations
14
Refereed citations
14
Description
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 $0.34\pm 0.02 \, \mathrm{M}_{\odot }$, 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.
Type
Refereed

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