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

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

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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 1.466−0.049+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).
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