[en] We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit is supported by ground-based follow-up observations, including time-series photometry, high-angular resolution images, spectroscopy, and archival imagery. Precise photometric monitoring with CHEOPS allows to improve the constraints on the parameters of the system, improving our knowledge on their composition. The improved radii of TOI-1260b and TOI-1260c are $2.36 \pm 0.06 \rm R_{\oplus }$, $2.82 \pm 0.08 \rm R_{\oplus }$, respectively while the newly discovered third planet has a radius of $3.09 \pm 0.09 \rm R_{\oplus }$. The radius uncertainties are in the range of 3 per cent, allowing a precise interpretation of the interior structure of the three planets. Our planet interior composition model suggests that all three planets in the TOI-1260 system contains some fraction of gas. The innermost planet TOI-1260b has most likely lost all of its primordial hydrogen-dominated envelope. Planets c and d were also likely to have experienced significant loss of atmospheric through escape, but to a lesser extent compared to planet b.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Lam, K. W. F.; Helmholtz Institute for Planetary Research, Berlin
Cabrera, J.; Helmholtz Institute for Planetary Research, Berlin
Hooton, M. J.; University of Bern, Physics Institute, University of Cambridge, Institute of Astronomy
Alibert, Y.; University of Bern, Physics Institute
Bonfanti, A.; Austrian Institute of Space Science Research
Beck, M.; University of Geneva, Astronomical Observatory
Deline, A.; University of Geneva, Astronomical Observatory
Florén, H. -G.; AlbaNova University Center
Simon, A. E.; University of Bern, Physics Institute
Fossati, L.; Austrian Institute of Space Science Research
Persson, C. M.; Onsala Space Observatory
Fridlund, M.; Onsala Space Observatory, Leiden Observatory
Salmon, Sébastien ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie ; University of Geneva, Astronomical Observatory
Hoyer, S.; Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Fr'ed'eric Joliot-Curie, F-13388 Marseille, France
Osborn, H. P.; University of Bern, Switzerland, MIT, Center for Space Research/Kavli Institute
Wilson, T. G.; Scottish Universities Physics Alliance
Georgieva, I. Y.; Onsala Space Observatory
Nowak, Gr; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Luque, R.; University of Chicago, Department of Astronomy and Astrophysics
Egger, J. A.; University of Bern, Physics Institute
Adibekyan, V.; University of Porto, Center for Astrophysics, University of Porto, Center for Astrophysics
Alonso, R.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Escudé, G. A.; Institut de Ciències de l'Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, E-08193 Bellaterra, Spain, Institut d'Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain
Barros, S. C. C.; University of Porto, Center for Astrophysics, University of Porto, Center for Astrophysics
Baumjohann, W.; Austrian Institute of Space Science Research
Beck, T.; University of Bern, Physics Institute
Bekkelien, A.; University of Geneva, Astronomical Observatory
Benz, W.; University of Bern, Physics Institute
Billot, N.; University of Geneva, Astronomical Observatory
Bonfils, X.; Institute de Planetologie et d'Astrophysique de Grenoble
Brandeker, A.; AlbaNova University Center
Broeg, C.; University of Bern, Physics Institute, University of Bern, Switzerland
Charnoz, S.; Institut de Physique du Globe de Paris
Cameron, A. C.; Scottish Universities Physics Alliance
Csizmadia, Sz; Helmholtz Institute for Planetary Research, Berlin
Davies, M. B.; University of Lund, Sweden
Deleuil, M.; Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Fr'ed'eric Joliot-Curie, F-13388 Marseille, France
Delrez, Laetitia ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Exoplanets in Transit: Identification and Characterization
Demangeon, O. D. S.; University of Porto, Center for Astrophysics, University of Porto, Center for Astrophysics
Demory, B. -O.; University of Bern, Switzerland
Ehrenreich, D.; University of Geneva, Astronomical Observatory
Erikson, A.; Helmholtz Institute for Planetary Research, Berlin
Fortier, A.; University of Bern, Physics Institute
Futyan, D.; University of Geneva, Astronomical Observatory
Gandolfi, D.; University of Turin, Department of Physics
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Guedel, M.; University of Vienna, Department of Astronomy
Guterman, P.; Aix Marseille Univ, CNRS, CNES, LAM, 38 rue Fr'ed'eric Joliot-Curie, F-13388 Marseille, France, Division Technique INSU, BP 330, F-83507 La Seyne cedex, France
Laskar, J.; Observatoire de Paris, Institut de Mecanique Celeste et de Calcul des Ephemerides
Latham, D. W.; Harvard Smithsonian Center for Astrophysics
Lecavelier des Etangs, A.; Institut d'astrophysique de Paris, UMR7095 CNRS, Universit'e Pierre &, Marie Curie, 98bis blvd. Arago, F-75014 Paris, France
Lendl, M.; University of Geneva, Astronomical Observatory
Lovis, C.; Austrian Institute of Space Science Research
Heng, K.; University of Bern, Switzerland, University of Warwick, Department of Physics
Isaak, K. G.; Science and Operations Department - Science Division (SCI-SC), Directorate of Science, European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, CH-2201-AZ Noordwijk, the Netherlands
Kiss, L.; Konkoly Observatory, Eotvos Lorand University, Hungary, University of Sydney, Department of Astronomy
Magrin, D.; Astronomical Observatory of Padua
Maxted, P. F. L.; Keele University, Department of Physics and Astrophysics
Nascimbeni, V.; Astronomical Observatory of Catania
Olofsson, G.; AlbaNova University Center
Ottensamer, R.; University of Vienna, Department of Astronomy
Pagano, I.; Astronomical Observatory of Catania
Pallé, E.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
Peter, G.; Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 2, D-12489 Berlin, Germany
Piotto, G.; Astronomical Observatory of Padua
Pollacco, D.; University of Warwick, Department of Physics
Queloz, D.; ETH Zurich, Department of Physics, Wolfgang-Pauli-Strasse 2, CH-8093 Zurich, Switzerland, Cavendish Laboratory, JJ Thomson Avenue, Cambridge CB3 0HE, UK
Ribas, I.; Institut de Ciències de l'Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, E-08193 Bellaterra, Spain, Institut d'Estudis Espacials de Catalunya (IEEC), E-08034 Barcelona, Spain
Ragazzoni, R.; Astronomical Observatory of Padua, Astronomical Observatory of Padua
Rando, N.; ESTEC, European Space Agency, NL-2201AZ, Noordwijk, the Netherlands
Rauer, H.; Helmholtz Institute for Planetary Research, Berlin, Technical University of Berlin, Center for Astronomy and Astrophysics, Free University of Berlin, Department of Geosciences
Santos, N. C.; University of Porto, Center for Astrophysics, University of Porto, Center for Astrophysics
Scandariato, G.; Astronomical Observatory of Catania
Seager, S.; MIT, Center for Space Research/Kavli Institute, MIT, Department of Earth and Planetary Science, Massachusetts Institute of Technology
Ségransan, D.; University of Geneva, Astronomical Observatory
Serrano, L. M.; University of Turin, Department of Physics
Smith, A. M. S.; Helmholtz Institute for Planetary Research, Berlin
Sousa, S. G.; University of Porto, Center for Astrophysics
Steller, M.; Austrian Institute of Space Science Research
Udry, S.; University of Geneva, Astronomical Observatory
Van Grootel, Valérie ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Walton, N. A.; University of Cambridge, Institute of Astronomy
Winn, J. N.; Princeton University, Department of Astrophysical Sciences
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