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Pozuelos, Francois-Xavier Schmider, Gabor Fuuresz, Gavin Wang, Georgina Dransfield, Hannu Parviainen, Howard M. Relles, Ian J. M. Crossfield, Ivan Bruni, Jack S. Acton, Jacob Kamler, Jake Taylor, James McCormac, J. I. Vines, John F. Kielkopf, Joseph D. Twicken, Joshua N. Winn, J. S. Jenkins, Karen A. Collins, Kevin I. Collins, Khalid Barkaoui, Laurel Kaye, Lyu Abe, Matthew R. Burleigh, Maximilian N. Gunther, Maximiliano Moyano, Michael Fausnaugh, Michael Gillon, Michael Greklek-McKeon, Michael R Goad, Michelle Kunimoto, Monika Lendl, Natalia Guerrero, Nicolas Crouzet, Oscar Barragan, Patricia T. Bo yd, Peter J. Wheatley, Rafael Brahm, Richard P. Schwarz, Ryan Cloutier, Samuel Gill, Sarah L. Casewell, Shreyas Vissapragada, S. Seager, Stephane Udry, Stephen R. Kane, Suzanne Aigrain, Tansu Daylan, Thiam-Guan Tan, Thomas Mikal-Evans, Tianjun Gan, Tristan Guillot, Varoujan Gorjian, Vivien Parmentier, Wenceslas Marie-Sainte","submitted_at":"2023-08-21T14:52:49Z","abstract_excerpt":"We present ground and space-based photometric observations of TOI-270 (L231-32), a system of three transiting planets consisting of one super-Earth and two sub-Neptunes discovered by TESS around a bright (K-mag=8.25) M3V dwarf. The planets orbit near low-order mean-motion resonances (5:3 and 2:1), and are thus expected to exhibit large transit timing variations (TTVs). 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