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K2-111: an old system with two planets in near-resonance†

  • Mortier, A ORCID Kavli Institute for Cosmology, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK
  • Zapatero Osorio, M R Centro de Astrobiología (CSIC-INTA), Crta. Ajalvir km 4, E-28850 Torrejón de Ardoz, Madrid, Spain
  • Malavolta, L ORCID Dip. di Fisica e Astronomia Galileo Galilei, Università di Padova, Vicolo dell’Osservatorio 2, I-35122, Padova, Italy
  • Alibert, Y Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
  • Rice, K ORCID Centre for Exoplanet Science, University of Edinburgh, Edinburgh, UK
  • Lillo-Box, J Centro de Astrobiología (CSIC-INTA), Crta. Ajalvir km 4, E-28850 Torrejón de Ardoz, Madrid, Spain
  • Vanderburg, A Department of Astronomy, The University of Texas at Austin, 2515 Speedway, Stop C1400, Austin, TX 78712, USA
  • Oshagh, M Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
  • Buchhave, L ORCID DTU Space, National Space Institute, Technical University of Denmark, Elektrovej 328, DK-2800 Kgs. Lyngby, Denmark
  • Adibekyan, V Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre, P-4169-007, Porto, Portugal
  • Delgado Mena, E Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, P-4150-762 Porto, Portugal
  • Lopez-Morales, M Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138 USA
  • Charbonneau, D Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138 USA
  • Sousa, S G ORCID Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, P-4150-762 Porto, Portugal
  • Lovis, C Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • Affer, L INAF, Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy
  • Allende Prieto, C Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
  • Barros, S C C Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, P-4150-762 Porto, Portugal
  • Benatti, S INAF, Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy
  • Bonomo, A S INAF, Osservatorio Astrofisico di Torino, via Osservatorio 20, I-10025 Pino Torinese, Italy
  • Boschin, W Fundación G. Galilei, INAF (Telescopio Nazionale Galileo), Rambla J. A. Fernández Pérez 7, E-38712 Breña Baja, La Palma, Spain
  • Bouchy, F Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • Cabral, A Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, P-1749-016 Lisboa, Portugal
  • Collier Cameron, A ORCID School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK
  • Cosentino, R Fundación G. Galilei, INAF (Telescopio Nazionale Galileo), Rambla J. A. Fernández Pérez 7, E-38712 Breña Baja, La Palma, Spain
  • Cristiani, S INAF, Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34143 Trieste, Italy
  • Demangeon, O D S Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre, P-4169-007, Porto, Portugal
  • Di Marcantonio, P INAF, Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11, I-34143 Trieste, Italy
  • D’Odorico, V Institute for Fundamental Physics of the Universe, IFPU, Via Beirut 2, I-34151 Grignano, Trieste, Italy
  • Dumusque, X Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • Ehrenreich, D Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • Figueira, P European Southern Observatory, Casilla, 19001, Santiago, Chile
  • Fiorenzano, A Fundación G. Galilei, INAF (Telescopio Nazionale Galileo), Rambla J. A. Fernández Pérez 7, E-38712 Breña Baja, La Palma, Spain
  • Ghedina, A Fundación G. Galilei, INAF (Telescopio Nazionale Galileo), Rambla J. A. Fernández Pérez 7, E-38712 Breña Baja, La Palma, Spain
  • González Hernández, J I Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
  • Haldemann, J ORCID Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
  • Harutyunyan, A Fundación G. Galilei, INAF (Telescopio Nazionale Galileo), Rambla J. A. Fernández Pérez 7, E-38712 Breña Baja, La Palma, Spain
  • Haywood, R D School of Physics, University of Exeter, Stocker Road, Exeter EX4 4QL, UK
  • Latham, D W Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138 USA
  • Lavie, B Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • Lo Curto, G European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748, Garching b. München, Germany
  • Maldonado, J INAF, Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy
  • Manescau, A European Southern Observatory, Karl-Schwarzschild-Strasse 2, D-85748, Garching b. München, Germany
  • Martins, C J A P ORCID Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, P-4150-762 Porto, Portugal
  • Mayor, M Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • Mégevand, D Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • Mehner, A European Southern Observatory, Casilla, 19001, Santiago, Chile
  • Micela, G INAF, Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, I-90134 Palermo, Italy
  • Molaro, P ORCID Institute for Fundamental Physics of the Universe, IFPU, Via Beirut 2, I-34151 Grignano, Trieste, Italy
  • Molinari, E INAF, Osservatorio Astronomico di Cagliari, via della Scienza 5, I-09047, Selargius, Italy
  • Nunes, N J Instituto de Astrofísica e Ciências do Espaço, Faculdade de Ciências da Universidade de Lisboa, Campo Grande, P-1749-016 Lisboa, Portugal
  • Pepe, F A Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • Palle, E Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
  • Phillips, D Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138 USA
  • Piotto, G Dip. di Fisica e Astronomia Galileo Galilei, Università di Padova, Vicolo dell’Osservatorio 2, I-35122, Padova, Italy
  • Pinamonti, M INAF, Osservatorio Astrofisico di Torino, via Osservatorio 20, I-10025 Pino Torinese, Italy
  • Poretti, E INAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy
  • Riva, M INAF, Osservatorio Astronomico di Brera, Via E. Bianchi 46, I-23807 Merate, Italy
  • Rebolo, R Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
  • Santos, N C Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre, P-4169-007, Porto, Portugal
  • Sasselov, D Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138 USA
  • Sozzetti, A INAF, Osservatorio Astrofisico di Torino, via Osservatorio 20, I-10025 Pino Torinese, Italy
  • Suárez Mascareño, A Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206 La Laguna, Tenerife, Spain
  • Udry, S Observatoire Astronomique de l’Université de Genève, Chemin des Maillettes 51, Sauverny, CH-1290, Switzerland
  • West, R G ORCID Astronomy Group, Department of Physics, University of Warwick, Coventry CV4 7AL, UK
  • Watson, C A Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, BT7 1NN Belfast, UK
  • Wilson, T G ORCID School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK
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  • 2020-10-27
Published in:
  • Monthly Notices of the Royal Astronomical Society. - Oxford University Press (OUP). - 2020, vol. 499, no. 4, p. 5004-5021
Space and Planetary Science
Astronomy and Astrophysics
English ABSTRACT
This paper reports on the detailed characterization of the K2-111 planetary system with K2, WASP, and ASAS-SN photometry, as well as high-resolution spectroscopic data from HARPS-N and ESPRESSO. The host, K2-111, is confirmed to be a mildly evolved (log g = 4.17), iron-poor ([Fe/H] = −0.46), but alpha-enhanced ([α/Fe]=0.27), chromospherically quiet, very old thick disc G2 star. A global fit, performed by using PyORBIT, shows that the transiting planet, K2-111 b, orbits with a period Pb = 5.3518 ± 0.0004 d and has a planet radius of $1.82^{+0.11}_{-0.09}$ R⊕ and a mass of $5.29^{+0.76}_{-0.77}$ M⊕, resulting in a bulk density slightly lower than that of the Earth. The stellar chemical composition and the planet properties are consistent with K2-111 b being a terrestrial planet with an iron core mass fraction lower than the Earth. We announce the existence of a second signal in the radial velocity data that we attribute to a non-transiting planet, K2-111 c, with an orbital period of 15.6785 ± 0.0064 d, orbiting in near-3:1 mean motion resonance with the transiting planet, and a minimum planet mass of 11.3 ± 1.1 M⊕. Both planet signals are independently detected in the HARPS-N and ESPRESSO data when fitted separately. There are potentially more planets in this resonant system, but more well-sampled data are required to confirm their presence and physical parameters.
Language
  • English
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green
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https://sonar.ch/global/documents/285627
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