Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO

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. 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. Methods: For the first time, we observed two bright stars (Teff = 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. 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. 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. 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>

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Sulis, S.; Aix-Marseille Universite, Laboratoire d'Astrophysique

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

Maxted, P. F. L.; Keele University, Department of Physics and Astrophysics

Simon, A. E.; University of Bern, Physics Institute

More authors (76 more)

Language :

English

Title :

Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO

Publication date :

01 February 2023

Journal title :

Astronomy and Astrophysics

ISSN :

0004-6361

eISSN :

1432-0746

Publisher :

EDP Sciences, Les Ulis, Fr

Volume :

670

Pages :

A24

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://ui.adsabs.harvard.edu/abs/2023A&A...670A..24S

Available on ORBi :

since 16 May 2023

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