Reference : The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transi...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/264938
The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS
English
Szabó, Gy M. mailto [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]
Gandolfi, D. [INAF, Osservatorio Astrofisico di Torino, via Osservatorio 20, 10025, Pino Torinese, Italy]
Brandeker, A. [Department of Astronomy, Stockholm University, AlbaNova University Center, 10691, Stockholm, Sweden]
Csizmadia, Sz [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Garai, Z. [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; Astronomical Institute, Slovak Academy of Sciences, 05960, Tatranská Lomnica, Slovakia]
Billot, N. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
Broeg, C. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Ehrenreich, D. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
Fortier, A. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Fossati, L. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Hoyer, S. [Aix Marseille Univ, CNRS, CNES, LAM, Marseille, France]
Kiss, L. [Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, 1121, Budapest, Konkoly Thege Miklós út 15-17, Hungary; ELTE Eötvös Loránd University, Institute of Physics, Pázmány Péter sétány 1/A, 1117, Budapest, Hungary; Sydney Institute for Astronomy, School of Physics A29, University of Sydney, NSW, 2006, Australia]
Lecavelier des Etangs, A. [Institut d'astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie, 98bis blvd. Arago, 75014, Paris, France]
Maxted, P. F. L. [Astrophysics Group, Keele University, Staffordshire, ST5 5BG, UK]
Ribas, I. [Institut de Ciències de l'Espai (ICE, CSIC), Campus UAB, C/CanMagrans s/n, 08193, Bellaterra, Spain; Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona, Spain]
Alibert, Y. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Alonso, R. [Instituto de Astrofísica de Canarias (IAC), 38200, La Laguna, Tenerife, Spain; Departamento de Astrofísica, Universidad de La Laguna (ULL), E-38206, La Laguna, Tenerife, Spain]
Anglada Escudé, G. [Institut de Ciències de l'Espai (ICE, CSIC), Campus UAB, C/CanMagrans s/n, 08193, Bellaterra, Spain; Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona, Spain]
Bárczy, T. [Admatis, Miskolc, Hungary]
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]
Barrado, D. [Depto. de Astrofísica, Centro de Astrobiologia (CSIC-INTA), ESAC campus, 28692, Villanueva de la Cãda (Madrid), Spain]
Baumjohann, W. [Space Research Institute, Austrian Academy of Sciences, Schmiedlstrasse 6, 8042, Graz, Austria]
Beck, M. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
Beck, T. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Bekkelien, A. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
Bonfils, X. [Université Grenoble Alpes, CNRS, IPAG, 38000, Grenoble, France]
Benz, W. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland; Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Borsato, L. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Busch, M.-D. [Physikalisches Institut, University of Bern, Gesellsschaftstrasse 6, 3012, Bern, Switzerland]
Cabrera, J. [Institute of Planetary Research, German Aerospace Center (DLR), Rutherfordstrasse 2, 12489, Berlin, Germany]
Charnoz, S. [Institut de Physique du Globe de Paris (IPGP), 1 rue Jussieu, 75005, Paris, France]
Collier Cameron, A. [School of Physics and Astronomy, Physical Science Building, North Haugh, St Andrews, UK]
Van Damme, C. Corral [ESTEC, European Space Agency, Keplerlaan 1, 2201, AZ Noordwijk, The Netherlands]
Davies, M. B. [Lund Observatory, Dept. of Astronomy and Theoreical Physics, Lund University, Box 43, 22100, Lund, Sweden]
Delrez, Laetitia mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Exotic >]
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]
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]
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 de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
García Muñoz, A. [Center for Astronomy and Astrophysics, Technical University Berlin, Hardenberstrasse 36, 10623, Berlin, Germany]
Gillon, Michaël mailto [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]
Heng, K. [Center for Space and Habitability, Gesellsschaftstrasse 6, 3012, Bern, Switzerland; Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK]
Isaak, K. G. [ESTEC, European Space Agency, Keplerlaan 1, 2201, AZ Noordwijk, The Netherlands]
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]
Laskar, J. [IMCEE, UMR8028 CNRS, Observatoire de Paris, PSL Univ., Sorbonne Univ., 77 av. Denfert-Rochereau, 75014, Paris, France]
Lendl, M. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
Lovis, C. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
Luntzer, A. [University of Vienna, Department of Astrophysics, Türkenschanzstrasse 17, 1180, Vienna, Austria]
Magrin, D. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Nascimbeni, V. [INAF, Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, 35122, Padova, Italy]
Olofsson, G. [Department of Astronomy, Stockholm University, AlbaNova University Center, 10691, Stockholm, 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]
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), E-38206, La Laguna, Tenerife, Spain]
Peter, G. [Institute of Optical Sensor Systems, German Aerospace Center (DLR), Rutherfordstrasse 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]
Queloz, D. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland; Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, CB3 0He, UK]
Ragazzoni, R. [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]
Rando, N. [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]
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]
Ségransan, D. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
Serrano, L. M. [Dipartimento di Fisica, Università degli Studi di Torino, Via Pietro Giuria 1, 10125, Torino, Italy]
Sicilia, D. [INAF, Osservatorio Astrofisico di Catania, Via S. Sofia 78, 95123, Catania, Italy]
Simon, Attila [Université de Berne > > > >]
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]
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]
Udry, S. [Observatoire de Genève, Université de Genève, Chemin Pegasi, 51 1290, Versoix, Switzerland]
Van Grootel, Valérie mailto [Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
Walton, N. A. [Astrophysics Group, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge, CB3 0He, UK]
Wilson, T. G. [School of Physics and Astronomy, Physical Science Building, North Haugh, St Andrews, UK)]
1-Oct-2021
Astronomy and Astrophysics
EDP Sciences
654
A159
Yes (verified by ORBi)
International
0004-6361
1432-0746
Les Ulis
France
[en] Astrophysics - Earth and Planetary Astrophysics ; Astrophysics - Solar and Stellar Astrophysics
[en] AU Mic is a young planetary system with a resolved debris disc showing signs of planet formation and two transiting warm Neptunes near mean-motion resonances. Here we analyse three transits of AU Mic b observed with the CHaracterising ExOPlanet Satellite (CHEOPS), supplemented with sector 1 and 27 Transiting Exoplanet Survey Satellite (TESS) photometry, and the All-Sky Automated Survey from the ground. The refined orbital period of AU Mic b is 8.462995 ± 0.000003 d, whereas the stellar rotational period is P[SUB]rot[/SUB] = 4.8367 ± 0.0006 d. The two periods indicate a 7:4 spin-orbit commensurability at a precision of 0.1%. Therefore, all transits are observed in front of one of the four possible stellar central longitudes. This is strongly supported by the observation that the same complex star-spot pattern is seen in the second and third CHEOPS visits that were separated by four orbits (and seven stellar rotations). Using a bootstrap analysis we find that flares and star spots reduce the accuracy of transit parameters by up to 10% in the planet-to-star radius ratio and the accuracy on transit time by 3-4 min. Nevertheless, occulted stellar spot features independently confirm the presence of transit timing variations (TTVs) with an amplitude of at least 4 min. We find that the outer companion, AU Mic c, may cause the observed TTVs.
http://hdl.handle.net/2268/264938
10.1051/0004-6361/202140345
https://ui.adsabs.harvard.edu/abs/2021A&A...654A.159S

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