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Gan, Tianjun; Soubkiou, Abderahmane; Wang, Sharon X.; Benkhaldoun, Zouhair; Mao, Shude; Artigau, Étienne; Fouqué, Pascal; Giacalone, Steven; Theissen, Christopher A.; Aganze, Christian; Collins, Karen A.; Shporer, Avi; Barkaoui, Khalid; Ghachoui, Mourad; Howell, Steve B.; Lamman, Claire; Olivier D. S. Demangeon; 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; Eric L. N. Jensen; Lin, Zitao; 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; Amaury H. M. J. Triaud; Vezie, Michael; Wells, Robert D.; de Wit, Julien; Ricker, George R.; Vanderspek, Roland; Latham, David W.; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.
2022Web Resource
We present the discovery of TOI-2136b, a sub-Neptune planet transiting every 7.85 days a nearby M4.5V-type star, identified through photometric measurements from the TESS mission. The host star is located $33$ pc away with a radius of $R_{\ast} = 0.34\pm0.02\ R_{\odot}$, a mass of $0.34\pm0.02\ M_{\odot}$ and an effective temperature of $\rm 3342\pm100\ K$. We estimate its stellar rotation period to be $75\pm5$ days based on archival long-term photometry. We confirm and characterize the planet based on a series of ground-based multi-wavelength photometry, high-angular-resolution imaging observations, and precise radial velocities from CFHT/SPIRou. Our joint analysis reveals that the planet has a radius of $2.19\pm0.17\ R_{\oplus}$, and a mass measurement of $6.4\pm2.4\ M_{\oplus}$. The mass and radius of TOI2136b is consistent with a broad range of compositions, from water-ice to gas-dominated worlds. TOI-2136b falls close to the radius valley for low-mass stars predicted by the thermally driven atmospheric mass loss models, making it an interesting target for future studies of its interior structure and atmospheric properties.
