Reference : Six transiting planets and a chain of Laplace resonances in TOI-178
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/261626
Six transiting planets and a chain of Laplace resonances in TOI-178
English
Leleu, A. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland ; Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Alibert, Y. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Hara, N. C. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Hooton, M. J. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Wilson, T. G. [Centre for Exoplanet Science, SUPA School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK]
Robutel, P. [IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ., Sorbonne Univ., 77 av. Denfert-Rochereau, 75014, Paris, France]
Delisle, J.-B. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Laskar, J. [IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ., Sorbonne Univ., 77 av. Denfert-Rochereau, 75014, Paris, France]
Hoyer, S. [Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France]
Lovis, C. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Bryant, E. M. [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Ducrot, Elsa [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Cabrera, J. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Delrez, Laetitia [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Acton, J. S. [School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK]
Adibekyan, V. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal; Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal]
Allart, R. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Allende Prieto, C. [Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain]
Alonso, R. [Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain]
Alves, D. [Camino El Observatorio 1515, Las Condes, Santiago, Chile]
Anderson, D. R. [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Angerhausen, D. [ETH Zürich, Institute for Particle Physics and Astrophysics, Zurich, Switzerland]
Anglada Escudé, G. [Institut de Ciències de l'Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, 08193, Bellaterra, Spain; Institut d'Estudis Espacials de Catalunya (IEEC), 08034, Barcelona, Spain]
Asquier, J. [ESTEC, European Space Agency, 2201AZ, Noordwijk, The Netherlands]
Barrado, D. [Departmento de Astrofísica, Centro de Astrobiologia (CSIC-INTA), ESAC campus, 28692, Villanueva de la Cãda (Madrid), Spain]
Barros, S. C. C. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal]
Baumjohann, W. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Bayliss, D. [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Beck, M. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Beck, T. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Bekkelien, A. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Benz, W. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland; Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Billot, N. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Bonfanti, A. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Bonfils, X. [Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France]
Bouchy, F. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Bourrier, V. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Boué, G. [IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ., Sorbonne Univ., 77 av. Denfert-Rochereau, 75014, Paris, France]
Brandeker, A. [Department of Astronomy, Stockholm University, AlbaNova University Center, 10691, Stockholm, Sweden]
Broeg, C. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland; Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Buder, M. [Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Burdanov, A. [Astrobiology Research Unit, Université de Liège, Allée du 6 Août 19C, 4000, Liège, Belgium; Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA]
Burleigh, M. R. [School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK]
Bárczy, T. [Admatis, Miskok, Hungary]
Cameron, A. C. [Centre for Exoplanet Science, SUPA School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, KY16 9SS, UK]
Chamberlain, S. [School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK]
Charnoz, S. [Université de Paris, Institut de physique du globe de Paris, CNRS, 75005, Paris, France]
Cooke, B. F. [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Corral Van Damme, C. [ESTEC, European Space Agency, 2201AZ, Noordwijk, The Netherlands]
Correia, A. C. M. [CFisUC, Department of Physics, University of Coimbra, 3004-516, Coimbra, Portugal; IMCCE, UMR8028 CNRS, Observatoire de Paris, PSL Univ., Sorbonne Univ., 77 av. Denfert-Rochereau, 75014, Paris, France]
Cristiani, S. [INAF - Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34143, Trieste, Italy]
Damasso, M. [INAF - Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025, Pino Torinese, Italy]
Davies, M. B. [Lund Observatory, Dept. of Astronomy and Theoretical Physics, Lund University, Box 43, 22100, Lund, Sweden]
Deleuil, M. [Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France]
Demangeon, O. D. S. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal]
Demory, B.-O. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Di Marcantonio, P. [INAF - Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34143, Trieste, Italy]
Di Persio, G. [INAF, Istituto di Astrofisica e Planetologia Spaziali, via del Fosso del Cavaliere 100, 00133, Roma, Italy]
Dumusque, X. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Ehrenreich, D. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Erikson, A. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Figueira, P. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal; European Southern Observatory, Alonso de Coórdova 3107, Vitacura, Región Metropolitana, Chile]
Fortier, A. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland; Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Fossati, L. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Fridlund, M. [Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA, Leiden, The Netherlands; Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 43992, Onsala, Sweden]
Futyan, D. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Gandolfi, D. [Dipartimento di Fisica, Università degli Studi di Torino, via Pietro Giuria 1, 10125, Torino, Italy]
García Muñoz, A. [Center for Astronomy and Astrophysics, Technical University Berlin, Hardenberstrasse 36, 10623, Berlin, Germany]
Garcia, Lionel [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Gill, S. [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Gillen, E. [Astronomy Unit, Queen Mary University of London, Mile End Road, London, E1 4NS, UK; Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK]
Gillon, Michaël [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Goad, M. R. [School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK]
González Hernández, J. I. [Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain]
Guedel, M. [University of Vienna, Department of Astrophysics, Türkenschanzstrasse 17, 1180, Vienna, Austria]
Günther, M. N. [Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA]
Haldemann, J. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Henderson, B. [School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK]
Heng, K. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Hogan, A. E. [School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK]
Isaak, K. [ESTEC, European Space Agency, 2201AZ, Noordwijk, The Netherlands]
Jehin, Emmanuel mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa) >]
Jenkins, J. S. [Departamento de Astronomía, Universidad de Chile, Camino El Observatorio 1515, Las Condes, Santiago, Chile; Centro de Astrofísica y Tecnologías Afines (CATA), Casilla 36-D, Santiago, Chile]
Jordán, A. [Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Av. Diagonal las Torres 2640, Peñalolén, Santiago, Chile; Millennium Institute for Astrophysics, Chile]
Kiss, L. [Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, 1121, Budapest, Konkoly Thege Miklós út 15-17, Hungary]
Kristiansen, M. H. [Brorfelde Observatory, Observator Gyldenkernes Vej 7, 4340, Tølløse, Denmark; DTU Space, National Space Institute, Technical University of Denmark, Elektrovej 327, 2800, Lyngby, Denmark]
Lam, K. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Lavie, B. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Lecavelier des Etangs, A. [Institut d'astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis blvd. Arago, 75014, Paris, France]
Lendl, M. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Lillo-Box, J. [Departmento de Astrofísica, Centro de Astrobiologia (CSIC-INTA), ESAC campus, 28692, Villanueva de la Cãda (Madrid), Spain]
Lo Curto, G. [European Southern Observatory, Alonso de Coórdova 3107, Vitacura, Región Metropolitana, Chile]
Magrin, D. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Martins, C. J. A. P. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal; Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762, Porto, Portugal]
Maxted, P. F. L. [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK]
McCormac, J. [Department of Physics, University of Warwick, xsCoventry, UK]
Mehner, A. [European Southern Observatory, Alonso de Coórdova 3107, Vitacura, Región Metropolitana, Chile]
Micela, G. [INAF - Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134, Palermo, Italy]
Molaro, P. [INAF - Osservatorio Astronomico di Trieste, via G. B. Tiepolo 11, 34143, Trieste, Italy; IFPU, Via Beirut 2, 34151, Grignano Trieste, Italy]
Moyano, M. [Instituto de Astronomía, Universidad Católica del Norte, Angamos 0610, Antofagasta, Chile]
Murray, C. A. [Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK]
Nascimbeni, V. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Nunes, N. J. [Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, 1749-016, Lisboa, Portugal]
Olofsson, G. [Department of Astronomy, Stockholm University, AlbaNova University Center, 10691, Stockholm, Sweden]
Osborn, H. P. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA]
Oshagh, M. [Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain]
Ottensamer, R. [Department of Astrophysics, University of Vienna, Tuerkenschanzstrasse 17, 1180, Vienna, Austria]
Pagano, I. [INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123, Catania, Italy]
Pallé, E. [Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain]
Pedersen, P. P. [Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK]
Pepe, F. A. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Persson, C. M. [Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 43992, Onsala, Sweden]
Peter, G. [Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Piotto, G. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy; Dipartimento di Fisica e Astronomia "Galileo Galilei", Università degli Studi di Padova, Vicolo dell'Osservatorio 3, 35122, Padova, Italy]
Polenta, G. [Space Science Data Center, ASI, via del Politecnico snc, 00133, Roma, Italy]
Pollacco, D. [Departmentof Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Poretti, E. [Fundación G. Galilei - INAF (Telescopio Nazionale Galileo), Rambla J. A. Fernández Pérez 7, 38712, Breña Baja, La Palma, Spain; INAF - Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807, Merate, Italy]
Pozuelos, F. J. [Astrobiology Research Unit, Université de Liège, Allée du 6 Août 19C, 4000, Liège, Belgium; Space sciences, Technologies and Astrophysics Research (STAR) Institute, Université de Liège, Allée du 6 Août 19C, 4000, Liège, Belgium]
Queloz, D. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland; Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK]
Ragazzoni, R. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Rando, N. [ESTEC, European Space Agency, 2201AZ, Noordwijk, The Netherlands]
Ratti, F. [ESTEC, European Space Agency, 2201AZ, Noordwijk, The Netherlands]
Rauer, H. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany; Center for Astronomy and Astrophysics, Technical University Berlin, Hardenberstrasse 36, 10623, Berlin, Germany; Institut für Geologische Wissenschaften, Freie Universität Berlin, 12249, Berlin, Germany]
Raynard, L. [School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK]
Rebolo, R. [Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain]
Reimers, C. [Department of Astrophysics, University of Vienna, Tuerkenschanzstrasse 17, 1180, Vienna, Austria]
Ribas, I. [Institut de Ciències de l'Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, 08193, Bellaterra, Spain; Institut d'Estudis Espacials de Catalunya (IEEC), 08034, Barcelona, Spain]
Santos, N. C. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007, Porto, Portugal]
Scandariato, G. [INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123, Catania, Italy]
Schneider, J. [Paris Observatory, LUTh UMR 8102, 92190, Meudon, France]
Sebastian, Daniel [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Sestovic, M. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Simon, Antoine [> > > >]
Smith, A. M. S. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Sousa, S. G. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal]
Sozzetti, A. [INAF - Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025, Pino Torinese, Italy]
Steller, M. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Suárez Mascareño, A. [Instituto de Astrofísica de Canarias, 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna, 38206, La Laguna, Tenerife, Spain]
Szabó, Gy M. [ELTE Eötvös Loránd University, Gothard Astrophysical Observatory, 9700, Szombathely, Szent Imre h. u. 112, Hungary; MTA-ELTE Exoplanet Research Group, 9700, Szombathely, Szent Imre h. u. 112, Hungary]
Ségransan, D. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Thomas, N. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Thompson, S. [Cavendish Laboratory, JJ Thomson Avenue, Cambridge, CB3 0HE, UK]
Tilbrook, R. H. [School of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, UK]
Triaud, A. [School of Physics & Astronomy, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK]
Turner, O. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Udry, S. [Observatoire Astronomique de l'Université de Genève, Chemin Pegasi 51, Versoix, Switzerland]
Van Grootel, Valérie [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Venus, H. [Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Verrecchia, F. [Space Science Data Center, ASI, via del Politecnico snc, 00133, Roma, Italy; INAF, Osservatorio Astronomico di Roma, via Frascati 33, 00078, Monte Porzio Catone, Roma, Italy]
Vines, J. I. [Camino El Observatorio 1515, Las Condes, Santiago, Chile]
Walton, N. A. [Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge, CB3 0HA, UK]
West, R. G. [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Wheatley, P. J. [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK; Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Wolter, D. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Zapatero Osorio, M. R. [Centro de Astrobiología (CSIC-INTA), Crta. Ajalvir km 4, 28850, Torrejón de Ardoz, Madrid, Spain)]
1-May-2021
Astronomy and Astrophysics
EDP Sciences
649
A26
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] techniques: photometric ; techniques: spectroscopic ; celestial mechanics ; planets and satellites: detection ; planets and satellites: dynamical evolution and stability ; Astrophysics - Earth and Planetary Astrophysics
[en] Determining the architecture of multi-planetary systems is one of the cornerstones of understanding planet formation and evolution. Resonant systems are especially important as the fragility of their orbital configuration ensures that no significant scattering or collisional event has taken place since the earliest formation phase when the parent protoplanetary disc was still present. In this context, TOI-178 has been the subject of particular attention since the first TESS observations hinted at the possible presence of a near 2:3:3 resonant chain. Here we report the results of observations from CHEOPS, ESPRESSO, NGTS, and SPECULOOS with the aim of deciphering the peculiar orbital architecture of the system. We show that TOI-178 harbours at least six planets in the super-Earth to mini-Neptune regimes, with radii ranging from 1.152‒0.070+0.073 to 2.87‒0.13+0.14 Earth radii and periods of 1.91, 3.24, 6.56, 9.96, 15.23, and 20.71 days. All planets but the innermost one form a 2:4:6:9:12 chain of Laplace resonances, and the planetary densities show important variations from planet to planet, jumping from 1.02‒0.23+0.28 to 0.177‒0.061+0.055 times the Earth's density between planets c and d. Using Bayesian interior structure retrieval models, we show that the amount of gas in the planets does not vary in a monotonous way, contrary to what one would expect from simple formation and evolution models and unlike other known systems in a chain of Laplace resonances. The brightness of TOI-178 (H = 8.76 mag, J = 9.37 mag, V = 11.95 mag) allows for a precise characterisation of its orbital architecture as well as of the physical nature of the six presently known transiting planets it harbours. The peculiar orbital configuration and the diversity in average density among the planets in the system will enable the study of interior planetary structures and atmospheric evolution, providing important clues on the formation of super-Earths and mini-Neptunes.
Professionals
http://hdl.handle.net/2268/261626
10.1051/0004-6361/202039767
https://ui.adsabs.harvard.edu/abs/2021A&A...649A..26L

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