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A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067

2023; Nature Portfolio; Volume: 623; Issue: 7989 Linguagem: Inglês

10.1038/s41586-023-06692-3

1476-4687

R. Luque, H. P. Osborn, A. Leleu, Ε. Πάλλη, A. Bonfanti, Oscar Barragán, T. G. Wilson, C. Broeg, A. Collier Cameron, M. Lendl, P. F. L. Maxted, Y. Alibert, D. Gandolfi, J.-B. Delisle, M. J. Hooton, J. A. Egger, G. Nowak, M. Lafarga, David Rapetti, Joseph D. Twicken, J. C. Morales, I. Carleo, J. Orell-Miquel, V. Adibekyan, R. Alonso, A. Alqasim, P. J. Amado, D. R. Anderson, G. Anglada‐Escudé, T. Bandy, T. Bárczy, D. Barrado, S. C. C. Barros, W. Baumjohann, D. Bayliss, Jacob L. Bean, M. Beck, T. Beck, W. Benz, N. Billot, X. Bonfıls, L. Borsato, A. W. Boyle, A. Brandeker, Edward M. Bryant, J. Cabrera, S. Carrazco-Gaxiola, D. Charbonneau, S. Charnoz, David R. Ciardi, William D. Cochran, Karen A. Collins, Ian J. M. Crossfield, Sz. Csizmadia, Patricio E. Cubillos, F. Dai, M. B. Davies, H. J. Deeg, M. Deleuil, A. Deline, L. Delrez, O. D. S. Demangeon, Brice-Olivier Demory, D. Ehrenreich, A. Erikson, E. Esparza-Borges, Ben Falk, A. Fortier, L. Fossati, M. Fridlund, Akihiko Fukui, Juliana García‐Mejía, Samuel Gill, M. Gillon, Elisa Goffo, Y. Gómez Maqueo Chew, M. Güdel, E. W. Guenther, Maximilian N. Günther, A. P. Hatzes, Ch. Helling, K. M. Hesse, Steve B. Howell, S. Hoyer, Kai Ikuta, K. G. Isaak, Jon M. Jenkins, T. Kagetani, L. L. Kiss, Takanori Kodama, J. Korth, K. W. F. Lam, J. Laskar, David W. Latham, A. Lecavelier des Étangs, Jerome de Leon, John H. Livingston, Demetrio Magrin, Rachel A. Matson, Elisabeth C. Matthews, C. Mordasini, M. Mori, Maximiliano Moyano, Matteo Munari, F. Murgas, Norio Narita, V. Nascimbeni, G. Olofsson, H. L. M. Osborne, R. Ottensamer, I. Pagano, H. Parviainen, G. Peter, G. Piotto, D. Pollacco, D. Queloz, Samuel N. Quinn, A. Quirrenbach, Roberto Ragazzoni, N. Rando, F. Ratti, H. Rauer, Seth Redfield, I. Ribas, G. Ricker, Alexander Rudat, L. Sabin, Sébastien Salmon, N. C. Santos, G. Scandariato, Nicole Schanche, Joshua E. Schlieder, Sara Seager, D. Ségransan, A. Shporer, A. E. Simon, A. M. S. Smith, S. G. Sousa, M. Stalport, Gy. M. Szabó, N. Thomas, A. Tuson, S. Udry, Andrew Vanderburg, Vincent Van Eylen, V. Van Grootel, J. Venturini, Ingo Walter, N. A. Walton, Noriharu Watanabe, Joshua N. Winn, T. Zingales,

Astrophysics and Star Formation Studies

Planets with radii between that of the Earth and Neptune (hereafter referred to as 'sub-Neptunes') are found in close-in orbits around more than half of all Sun-like stars1,2. However, their composition, formation and evolution remain poorly understood3. The study of multiplanetary systems offers an opportunity to investigate the outcomes of planet formation and evolution while controlling for initial conditions and environment. Those in resonance (with their orbital periods related by a ratio of small integers) are particularly valuable because they imply a system architecture practically unchanged since its birth. Here we present the observations of six transiting planets around the bright nearby star HD 110067. We find that the planets follow a chain of resonant orbits. A dynamical study of the innermost planet triplet allowed the prediction and later confirmation of the orbits of the rest of the planets in the system. The six planets are found to be sub-Neptunes with radii ranging from 1.94R⊕ to 2.85R⊕. Three of the planets have measured masses, yielding low bulk densities that suggest the presence of large hydrogen-dominated atmospheres.