Reference : CHEOPS observations of the HD 108236 planetary system: a fifth planet, improved ephem...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/258658
CHEOPS observations of the HD 108236 planetary system: a fifth planet, improved ephemerides, and planetary radii
English
Bonfanti, A. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Delrez, Laetitia [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Hooton, M. J. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Wilson, T. G. [School of Physics and Astronomy, Physical Science Building, North Haugh, St Andrews, UK]
Fossati, L. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Alibert, Y. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Hoyer, S. [Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France]
Mustill, A. J. [Lund Observatory, Dept. of Astronomy and Theorical Physics, Lund University, Box 43, 22100, Lund, Sweden]
Osborn, H. P. [NCCR/PlanetS, Centre for Space & Habitability, University of Bern, Bern, Switzerland; Department of Physics and Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, Cambridge, MA 02139, USA]
Adibekyan, V. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal]
Gandolfi, D. [INAF, Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025, Pino Torinese, Italy]
Salmon, Sébastien mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Sousa, S. G. [Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal]
Tuson, A. [Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, CB3 0He, UK]
Van Grootel, Valérie [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Cabrera, J. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Nascimbeni, V. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Maxted, P. F. L. [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK]
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]
Billot, N. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Bonfils, X. [Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France]
Borsato, L. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Broeg, C. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Davies, M. B. [Lund Observatory, Dept. of Astronomy and Theorical Physics, Lund University, Box 43, 22100, Lund, Sweden]
Deleuil, M. [Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France]
Demangeon, O. D. S. [Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France; Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762, Porto, Portugal]
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]
Lacedelli, G. [Dipartimento di Fisica e Astronomia "Galileo Galilei", Universià degli Studi di Padova, Vicolo dell'Osservatorio 3, 35122, Padova, Italy; INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Lendl, M. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Persson, C. [Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, 43992, Onsala, Sweden]
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]
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]
Collier Cameron, A. [School of Physics and Astronomy, Physical Science Building, North Haugh, St Andrews, UK]
Udry, S. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Benz, W. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland; Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Beck, M. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Ehrenreich, D. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Fortier, A. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Isaak, K. G. [ESTEC, European Space Agency, Keplerlaan 1, 2201, AZ Noordwijk, The Netherlands]
Queloz, D. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland; Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, CB3 0He, UK]
Alonso, R. [Instituto de Astrofísica de Canarias (IAC), 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain]
Asquier, J. [ESTEC, European Space Agency, Keplerlaan 1, 2201, AZ Noordwijk, The Netherlands]
Bandy, T. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Bárczy, T. [Admatis, Miskok, Hungary]
Barrado, D. [Depto. de Astrofísica, Centro de Astrobiologia (CSIC-INTA), ESAC campus, 28692, Villanueva de la Cãda (Madrid), Spain]
Barragán, O. [Sub-department of Astrophysics, Department of Physics, University of Oxford, Oxford, OX1 3RH, UK]
Baumjohann, W. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Beck, T. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Bekkelien, A. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Bergomi, M. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Brandeker, A. [Department of Astronomy, Stockholm University, AlbaNova University Center, 10691, Stockholm, Sweden]
Busch, M.-D. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Cessa, V. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Charnoz, S. [Institut de Physique du Globe de Paris (IPGP), 1 rue Jussieu, 75005, Paris, France]
Chazelas, B. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Corral Van Damme, C. [ESTEC, European Space Agency, Keplerlaan 1, 2201, AZ Noordwijk, The Netherlands]
Demory, B.-O. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Erikson, A. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Farinato, J. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Futyan, D. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Garcia Muñoz, A. [Center for Astronomy and Astrophysics, Technical University Berlin, Hardenberstrasse 36, 10623, Berlin, Germany]
Gillon, Michaël [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
Guedel, M. [University of Vienna, Department of Astrophysics, Türkenschanzstrasse 17, 1180, Vienna, Austria]
Guterman, P. [Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France; Division Technique INSU, BP 330, 83507, La Seyne cedex, France]
Hasiba, J. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Heng, K. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Hernandez, E. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Kiss, L. [Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, 1121, Budapest, Konkoly Thege Miklós út 15-17, Hungary]
Kuntzer, T. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Laskar, J. [IMCEE, UMR8028 CNRS, Observatoire de Paris, PSL Univ., Sorbonne Univ., 77 av. Denfert-Rochereau, 75014, Paris, France]
Lecavelier des Etangs, A. [Institut d'astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis blvd. Arago, 75014, Paris, France]
Lovis, C. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Magrin, D. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Malvasio, L. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Marafatto, L. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Michaelis, H. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Munari, M. [INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123, Catania, Italy]
Olofsson, G. [Department of Astronomy, Stockholm University, AlbaNova University Center, 10691, Stockholm, Sweden]
Ottacher, H. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Ottensamer, R. [University of Vienna, Department of Astrophysics, Türkenschanzstrasse 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 (IAC), 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), 38206, La Laguna, Tenerife, Spain]
Peter, G. [Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstr. 2, 12489, Berlin, Germany]
Piazza, D. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Piotto, G. [Dipartimento di Fisica e Astronomia "Galileo Galilei", Universià degli Studi di Padova, Vicolo dell'Osservatorio 3, 35122, Padova, Italy; INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Pollacco, D. [Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Ragazzoni, R. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Rando, N. [ESTEC, European Space Agency, Keplerlaan 1, 2201, AZ Noordwijk, The Netherlands]
Ratti, F. [ESTEC, European Space Agency, Keplerlaan 1, 2201, AZ 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]
Ribas, I. [Institut de Ciències de l'Espai (ICE, CSIC), Campus UAB, C/CanMagrans s/n, 08193, Bellaterra, Spain; Institut d'Estudis Espacials deCatalunya (IEEC), Barcelona, Spain]
Rieder, M. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Rohlfs, R. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Safa, F. [ESTEC, European Space Agency, Keplerlaan 1, 2201, AZ Noordwijk, The Netherlands]
Salatti, M. [Italian Space Agency, Via del Politecnico, 00133, Rome, Italy]
Ségransan, D. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Simon, A. []
Smith, A. M. S. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Sordet, M. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Steller, M. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Thomas, N. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Tschentscher, M. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Van Eylen, V. [<addr-lineMullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey, RH5 6NT, UK</addr-line]
Viotto, V. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Walter, I. [Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstr. 2, 12489, Berlin, Germany]
Walton, N. A. [Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, CB3 0He, UK]
Wildi, F. [Observatoire de Genève, Université de Genève, Chemin des Maillettes 51, 1290, Sauverny, Switzerland]
Wolter, D. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany)]
1-Feb-2021
Astronomy and Astrophysics
EDP Sciences
646
A157
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] ephemerides ; planets and satellites: detection ; planets and satellites: fundamental parameters ; stars: fundamental parameters ; Astrophysics - Earth and Planetary Astrophysics
[en] Context. The detection of a super-Earth and three mini-Neptunes transiting the bright (V = 9.2 mag) star HD 108236 (also known as TOI-1233) was recently reported on the basis of TESS and ground-based light curves. <BR /> Aims: We perform a first characterisation of the HD 108236 planetary system through high-precision CHEOPS photometry and improve the transit ephemerides and system parameters. <BR /> Methods: We characterise the host star through spectroscopic analysis and derive the radius with the infrared flux method. We constrain the stellar mass and age by combining the results obtained from two sets of stellar evolutionary tracks. We analyse the available TESS light curves and one CHEOPS transit light curve for each known planet in the system. <BR /> Results: We find that HD 108236 is a Sun-like star with R[SUB]⋆[/SUB] = 0.877 ± 0.008 R[SUB]⊙[/SUB], M[SUB]⋆[/SUB] = 0.869[SUB]-0.048[/SUB][SUP]+0.050[/SUP] M[SUB]⊙[/SUB], and an age of 6.7[SUB]-5.1[/SUB][SUP]+4.0[/SUP] Gyr. We report the serendipitous detection of an additional planet, HD 108236 f, in one of the CHEOPS light curves. For this planet, the combined analysis of the TESS and CHEOPS light curves leads to a tentative orbital period of about 29.5 days. From the light curve analysis, we obtain radii of 1.615 ± 0.051, 2.071 ± 0.052, 2.539[SUB]-0.065[/SUB][SUP]+0.062[/SUP], 3.083 ± 0.052, and 2.017[SUB]-0.057[/SUB][SUP]+0.052[/SUP] R[SUB]⊕[/SUB] for planets HD 108236 b to HD 108236 f, respectively. These values are in agreement with previous TESS-based estimates, but with an improved precision of about a factor of two. We perform a stability analysis of the system, concluding that the planetary orbits most likely have eccentricities smaller than 0.1. We also employ a planetary atmospheric evolution framework to constrain the masses of the five planets, concluding that HD 108236 b and HD 108236 c should have an Earth-like density, while the outer planets should host a low mean molecular weight envelope. <BR /> Conclusions: The detection of the fifth planet makes HD 108236 the third system brighter than V = 10 mag to host more than four transiting planets. The longer time span enables us to significantly improve the orbital ephemerides such that the uncertainty on the transit times will be of the order of minutes for the years to come. A comparison of the results obtained from the TESS and CHEOPS light curves indicates that for a V ~ 9 mag solar-like star and a transit signal of ~500 ppm, one CHEOPS transit light curve ensures the same level of photometric precision as eight TESS transits combined, although this conclusion depends on the length and position of the gaps in the light curve. <P />Light curves are only available at the CDS via anonymous ftp to <A href="http://cdsarc.u-strasbg.fr">http://cdsarc.u-strasbg.fr</A> (ftp://130.79.128.5) or via <A href="http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/646/A157">http://cdsarc.u-strasbg.fr/viz-bin/cat/J/A+A/646/A157</A>
Space sciences, Technologies and Astrophysics Research - STAR
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/258658
https://ui.adsabs.harvard.edu/abs/2021A&A...646A.157B
The postprint journal version is available at www.aanda.org

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