Y. Gómez Maqueo Chew, G. Dransfield, K. Barkaoui, C. Cadieux, E. Ducrot, B. V. Rackham, M. Timmermans, A. Burgasser, A. Segura, K. G. Stassun, C. Ziegler, A. Soubkiou, J. -M. Almenara, B.-O. Demory, M. Gillon, J. M. Jenkins, E. Jofré, A. Khandelwal, S. Páez, R. Petrucci, L. Parc, M. P. Marcano, I. Plauchu-Frayn, U. Schroffenegger, R. P. Schwarz, T.-G. Tan, A. H. M. J. Triaud, Z. Benkhaldoun, X. Bonfils, F. Bouchy, K. A. Collins, F. Davoudi, R. Doyon, M. Gachaoui, M. J. Hooton, E. Jehin, F. J. Pozuelos, M. G. Scott, S. Yalcinkaya, F. Zong Lang, S. Zúñiga-Fernández, J. R. de Medeiros, J. I. González-Hernández, N. C. Santos
Abstract
We present the detection and validation of a small, temperate transiting exoplanet orbiting TOI-1080 every 3.9652482+0.0000014−0.0000015 d. The host is a quiet M4V star at 25.6 pc. The planet signal was first detected by the Transiting Exoplanet Survey Satellite (TESS) and validated using TESS and ground-based observations. By fitting the available light curves, the planet radius is measured to be 1.200 ± 0.058 R⊕ and its equilibrium temperature of 368+12−10. K. With Near Infra Red Planet Searcher (NIRPS) radial velocities, we are able to place a 3σ upper limit on the mass of TOI-1080 b of 10.7 M⊕. Our injection-recovery tests enable us to discard additional transiting planets in the TOI-1080 system with radii down to 0.9 R⊕ and periods between 0.5 and 7.7 d, and planets with radii larger than 1.4 R⊕ for periods up to 19 d. We demonstrate that it is highly amenable to characterization of its mass and putative atmosphere. In particular, we find that TOI-1080 b is an exceptional target for the ongoing JWST + HST Rocky Worlds DDT programme, having a priority score that is higher than four out of nine targets currently being investigated by the programme. TOI-1080 b can be added to the sample of nearby benchmark planets accessible for detailed study with JWST.
Keywords
techniques: spectroscopic; techniques: photometric; exoplanets; stars: individual: TOI-1080; stars: low-mass; planetary systems
Monthly Notices of the Royal Astronomical Society
Volume 548, Issue stag438, Page 15
2026 May
