Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO
Artikel i vetenskaplig tidskrift, 2023

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.

Sun: granulation

Stars: Atmospheres

Techniques: radial velocities

Methods: data analysis

Techniques: photometric

Författare

S. Sulis

Laboratoire d'Astrophysique de Marseille

M. Lendl

Université de Genève

H. M. Cegla

The University of Warwick

L. F. Rodríguez Díaz

Aarhus Universitet

L. Bigot

Observatoire de la Cote d'Azur

V. Van Grootel

Universite de Liège

A. Bekkelien

Université de Genève

A. Collier Cameron

University of St Andrews

P. Maxted

Keele University

A.E. Simon

Universität Bern

C. Lovis

Université de Genève

Gaetano Scandariato

Istituto nazionale di astrofisica (INAF)

G. Bruno

Istituto nazionale di astrofisica (INAF)

D. Nardiello

Istituto nazionale di astrofisica (INAF)

A. Bonfanti

Institut fur Weltraumforschung

Malcolm Fridlund

Universiteit Leiden

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

Carina Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik

S. Salmon

Université de Genève

S. G. Sousa

Universidade do Porto

T. G. Wilson

University of St Andrews

A. Krenn

Université de Genève

Institut fur Weltraumforschung

S. Hoyer

Laboratoire d'Astrophysique de Marseille

A. Santerne

Laboratoire d'Astrophysique de Marseille

D. Ehrenreich

Université de Genève

Y. Alibert

Universität Bern

R. Alonso

Instituto de Astrofísica de Canarias

Universidad de la Laguna

G. Anglada

Institut d'Estudis Espacials de Catalunya (IEEC)

Institut de Ciències de l'Espai (ICE) - CSIC

T. Bárczy

Admatis

D. Barrado

Centro de Astrobiologia (CAB)

S. C.C. Barros

Universidade do Porto

W. Baumjohann

Institut fur Weltraumforschung

M. Beck

Université de Genève

T. Beck

Universität Bern

W. Benz

Universität Bern

N. Billot

Université de Genève

X. Bonfils

Institut de Planétologie et d’Astrophysique de Grenoble (IPAG)

L. Borsato

Istituto nazionale di astrofisica (INAF)

A. Brandeker

Stockholms universitet

C. Broeg

Universität Bern

J. Cabrera

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

S. Charnoz

Institut de Physique du Globe de Paris

C. Corral Van Damme

European Space Research and Technology Centre (ESA ESTEC)

Szilard Csizmadia

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. B. Davies

Lunds universitet

M. Deleuil

Laboratoire d'Astrophysique de Marseille

A. Deline

Université de Genève

L. Delrez

Universite de Liège

O. Demangeon

Universidade do Porto

B.O. Demory

Universität Bern

Anders Erikson

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

A. Fortier

Universität Bern

L. Fossati

Institut fur Weltraumforschung

D. Gandolfi

Universita degli Studi di Torino

Michaël Gillon

Universite de Liège

M. Gudel

Universität Wien

Kevin Heng

Universität Bern

The University of Warwick

K. Isaak

European Space Research and Technology Centre (ESA ESTEC)

L.L. Kiss

Eötvös Loránd University (ELTE)

Magyar Tudomanyos Akademia

J. Laskar

Observatoire de Paris

A. L. des Etangs

Institut d 'Astrophysique de Paris

D. Magrin

Istituto nazionale di astrofisica (INAF)

M. Munari

Istituto nazionale di astrofisica (INAF)

Valerio Nascimbeni

Istituto nazionale di astrofisica (INAF)

G. Olofsson

Stockholms universitet

R. Ottensamer

Universität Wien

I. Pagano

Istituto nazionale di astrofisica (INAF)

E. Palle

Instituto de Astrofísica de Canarias

G. Peter

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Giampaolo P. Piotto

Istituto nazionale di astrofisica (INAF)

Università di Padova

D. Pollacco

The University of Warwick

D. Queloz

Eidgenössische Technische Hochschule Zürich (ETH)

University of Cambridge

Roberto Ragazzoni

Università di Padova

Istituto nazionale di astrofisica (INAF)

N. Rando

European Space Research and Technology Centre (ESA ESTEC)

H. Rauer

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Technische Universität Berlin

Freie Universität Berlin

I. Ribas

Institut de Ciències de l'Espai (ICE) - CSIC

Institut d'Estudis Espacials de Catalunya (IEEC)

M. Rieder

Universität Bern

N. C. Santos

Universidade do Porto

D. Segransan

Université de Genève

A. M.S. Smith

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

M. Steinberger

Institut fur Weltraumforschung

Manfred B. Steller

Institut fur Weltraumforschung

Gy M. Szabó

Eötvös Loránd University (ELTE)

N. Thomas

Universität Bern

S. Udry

Université de Genève

N. A. Walton

University of Cambridge

D. Wolter

Deutsches Zentrums für Luft- und Raumfahrt (DLR)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 670 A24

Ämneskategorier

Astronomi, astrofysik och kosmologi

Bioinformatik (beräkningsbiologi)

Sannolikhetsteori och statistik

DOI

10.1051/0004-6361/202244223

Mer information

Senast uppdaterat

2023-09-15