methods: data analysis; Sun: granulation; stars: atmospheres; techniques: photometric; techniques: radial velocities; Astrophysics -; Solar and Stellar Astrophysics; Astrophysics - Earth and Planetary; Astrophysics
Abstract :
[en] Context. Stellar granulation generates fluctuations in photometric and spectroscopic data whose properties depend on the stellar type, composition, and evolutionary state. Characterizing granulation is key for understanding stellar atmospheres and detecting planets. <BR /> Aims: We aim to detect the signatures of stellar granulation, link spectroscopic and photometric signatures of convection for main-sequence stars, and test predictions from 3D hydrodynamic models. <BR /> Methods: For the first time, we observed two bright stars (T<SUB>eff</SUB> = 5833 and 6205 K) with high-precision observations taken simultaneously with CHEOPS and ESPRESSO. We analyzed the properties of the stellar granulation signal in each individual dataset. We compared them to Kepler observations and 3D hydrodynamic models. While isolating the granulation-induced changes by attenuating and filtering the p-mode oscillation signals, we studied the relationship between photometric and spectroscopic observables. <BR /> Results: The signature of stellar granulation is detected and precisely characterized for the hotter F star in the CHEOPS and ESPRESSO observations. For the cooler G star, we obtain a clear detection in the CHEOPS dataset only. The TESS observations are blind to this stellar signal. Based on CHEOPS observations, we show that the inferred properties of stellar granulation are in agreement with both Kepler observations and hydrodynamic models. Comparing their periodograms, we observe a strong link between spectroscopic and photometric observables. Correlations of this stellar signal in the time domain (flux versus radial velocities, RV) and with specific spectroscopic observables (shape of the cross-correlation functions) are however difficult to isolate due to S/N dependent variations. <BR /> Conclusions: In the context of the upcoming PLATO mission and the extreme precision RV surveys, a thorough understanding of the properties of the stellar granulation signal is needed. The CHEOPS and ESPRESSO observations pave the way for detailed analyses of this stellar process. <P />Full Table F.1 and a copy of the data are available at the CDS via anonymous ftp to <A href="https://cdsarc.cds.unistra.fr">cdsarc.cds.unistra.fr</A> (ftp://130.79.128.5) or via <A href="https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/670/A24">https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/670/A24</A>
Lendl, M.; University of Geneva, Astronomical Observatory
Cegla, H. M.; University of Warwick, UK, University of Warwick, Department of Physics
Rodríguez Díaz, L. F.; Aarhus University, Institute for Physics and Astronomy
Bigot, L.; Laboratoire Universitaire d'Astrophysique de Nice
Van Grootel, Valérie ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
Bekkelien, A.; University of Geneva, Astronomical Observatory
Cameron, A. Collier; Scottish Universities Physics Alliance
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Lovis, C.; University of Geneva, Astronomical Observatory
Scandariato, G.; Astronomical Observatory of Catania
Bruno, G.; Astronomical Observatory of Catania
Nardiello, D.; Astronomical Observatory of Padua
Bonfanti, A.; Austrian Institute of Space Science Research
Fridlund, M.; Leiden Observatory, Onsala Space Observatory
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Salmon, S.; University of Geneva, Astronomical Observatory
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Wilson, T. G.; Scottish Universities Physics Alliance
Krenn, A.; University of Geneva, Astronomical Observatory, Austrian Institute of Space Science Research
Ehrenreich, D.; University of Geneva, Astronomical Observatory
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Alonso, R.; Astrophysical Institute of the Canaries, University of La Laguna, Department of Astrophysics
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Baumjohann, W.; Austrian Institute of Space Science Research
Beck, M.; University of Geneva, Astronomical Observatory
Beck, T.; University of Bern, Physics Institute
Benz, W.; University of Bern, Physics Institute, University of Bern, Switzerland
Billot, N.; University of Geneva, Astronomical Observatory
Bonfils, X.; Institute de Planetologie et d'Astrophysique de Grenoble
Borsato, L.; Astronomical Observatory of Padua
Brandeker, A.; AlbaNova University Center
Broeg, C.; University of Bern, Physics Institute, -
Cabrera, J.; Helmholtz Institute for Planetary Research, Berlin
Charnoz, S.; Institut de Physique du Globe de Paris
Corral van Damme, C.; European Space Research and Technology Centre
Csizmadia, Sz.; Helmholtz Institute for Planetary Research, Berlin
Davies, M. B.; University of Lund, Sweden
Deleuil, M.; Aix-Marseille Universite, Laboratoire d'Astrophysique
Deline, A.; University of Geneva, Astronomical Observatory
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Demangeon, O. D. S.; University of Porto, Center for Astrophysics, University of Porto, Center for Astrophysics
Demory, B. -O.; University of Bern, Switzerland
Erikson, A.; Helmholtz Institute for Planetary Research, Berlin
Fortier, A.; University of Bern, Physics Institute, University of Bern, Switzerland
Fossati, L.; Austrian Institute of Space Science Research
Gandolfi, D.; University of Turin, Department of Physics
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO)
Güdel, M.; University of Vienna, Department of Astronomy
Heng, K.; University of Bern, Switzerland, University of Warwick, Department of Physics
Isaak, K. G.; Science and Operations Department - Science Division (SCI-SC), Directorate of Science, European Space Agency (ESA), European Space Research and Technology Centre (ESTEC), Keplerlaan 1, 2201-AZ, Noordwijk, The Netherlands
Kiss, L. L.; Konkoly Observatory, Eotvos Lorand University, Hungary
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Rando, N.; European Space Research and Technology Centre
Rauer, H.; Helmholtz Institute for Planetary Research, Berlin, Technical University of Berlin, Center for Astronomy and Astrophysics, Free University of Berlin, Department of Geosciences
Ribas, I.; Institut de Ciencies de l'Espai (ICE, CSIC), Campus UAB, Can Magrans s/n, 08193, Bellaterra, Spain, Institut d'Estudis Espacials de Catalunya (IEEC), 08034, Barcelona, Spain
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Ségransan, D.; University of Geneva, Astronomical Observatory
Smith, A. M. S.; Helmholtz Institute for Planetary Research, Berlin
Steinberger, M.; Austrian Institute of Space Science Research
Steller, M.; Austrian Institute of Space Science Research
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