TESS discovery of a super-Earth orbiting the M-dwarf star TOI-1680

M. Ghachoui, A. Soubkiou, R. D. Wells, B. V. Rackham, A. H.M.J. Triaud, D. Sebastian, S. Giacalone, K. G. Stassun, D. R. Ciardi, K. A. Collins, A. Liu, Y. Gómez Maqueo Chew, M. Gillon, Z. Benkhaldoun, L. Delrez, J. D. Eastman, O. Demangeon, K. Barkaoui, A. Burdanov, B. O. DemoryJ. De Wit, G. Dransfield, E. Ducrot, L. Garcia, M. A. Gómez-Muñoz, M. J. Hooton, E. Jehin, C. A. Murray, P. P. Pedersen, F. J. Pozuelos, D. Queloz, L. Sabin, N. Schanche, M. Timmermans, E. J. Gonzales, C. D. Dressing, C. Aganze, A. J. Burgasser, R. Gerasimov, C. Hsu, C. A. Theissen, D. Charbonneau, J. M. Jenkins, D. W. Latham, G. Ricker, S. Seager, A. Shporer, J. D. Twicken, R. Vanderspek, J. N. Winn, K. I. Collins, A. Fukui, T. Gan, N. Narita, R. P. Schwarz

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We report the discovery by the TESS mission of a super-Earth on a 4.8-days orbit around an inactive M4.5 dwarf (TOI-1680), validated by ground-based facilities. The host star is located 37.14 pc away, with a radius of 0.2100 ± 0.0064 R, mass of 0.1800 ± 0.0044 M, and an effective temperature of 3211 ±100 K. We validated and characterized the planet using TESS data, ground-based multi-wavelength photometry from TRAPPIST, SPECULOOS, and LCO, as well as high-resolution AO observations from Keck/NIRC2 and Shane. Our analyses have determined the following parameters for the planet: a radius of 1.4660.049+0.063 R and an equilibrium temperature of 404 ± 14 K, assuming no albedo and perfect heat redistribution. Assuming a mass based on mass-radius relations, this planet is a promising target for atmospheric characterization with the James Webb Space Telescope (JWST).

Original languageEnglish (US)
Article numberA31
JournalAstronomy and Astrophysics
StatePublished - Sep 1 2023

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Planets and satellites: detection
  • Techniques: photometric


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