J/A+A/670/A24ivo://CDS.VizieR/J/A+A/670/A24doi:10.26093/cds/vizier.36700024CDSSulis S.Lendl M.Cegla H.Rodriguez Diaz L.F.Bigot L.Van Grootel V.,Bekkelien A.Collier Cameron A.Maxted P.F.L.Simon A.E.Lovis C.,Scandariato G.Bruno G.Nardiello D.Bonfanti A.Fridlund M.,Persson C.M.Salmon S.Sousa S.G.Wilson T.G.Krenn A.Hoyer S.,Santerne A.Ehrenreich D.Alibert Y.Alonso R.Anglada G.Barczy T.,Barrado y Navascues D.Barros S.C.C.Baumjohann W.Beck M.Beck T.,Benz W.Billot N.Bonfils X.Borsato L.Brandeker A.Broeg C.,Cabrera J.Charnoz S.Corral van Damme C.Csizmadia Sz.Davies M.B.,Deleuil M.Deline A.Delrez L.Demangeon O.D.S.Demory B.-O.,Erikson A.Fortier A.Fossati L.Gandolfi D.Gillon M.Guedel M.,Heng K.Isaak K.G.Kiss L.L.Laskar J.Lecavelier des Etangs A.,Magrin D.Munari M.Nascimbeni V.Olofsson G.Ottensamer R.Pagano I.,Palle E.Peter G.Piotto G.Pollacco D.Queloz D.Ragazzoni R.,Rando N.Rauer H.Ribas I.Rieder M.Santos N.C.Segransan D.,Smith A.M.S.Steinberger M.Steller M.Szabo Gy.M.Thomas N.Udry S.,Walton N.A.Wolter D.2023-02-25T10:22:11Z2023-02-01T08:34:35ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frdwarf-starsstellar-masseseffective-temperaturephotometryvisible-astronomyStellar 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. We aim at detecting the signatures of stellar granulation, linking spectroscopic and photometric signatures of convection for main-sequence stars, and testing predictions from 3D hydrodynamic models. For the first time, we observed two bright stars (Teff=5833K and 6205K) with high-precision observations taken simultaneously with CHEOPS and ESPRESSO. We analyzed the properties of the stellar granulation signal in each individual data set. We compared them to Kepler observations and 3D hydrodynamic models. While isolating the granulation-induced changes by attenuating/filtering the p-mode oscillation signals, we studied the relationship between photometric and spectroscopic observables. 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) and with specific spectroscopic observables (shape of the cross-correlation functions) are however difficult to isolate due to signal-to-noise dependent variations. In the context of the upcoming PLATO mission and the extreme precision radial velocity 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.2023A&A...670A..24Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/670/A24CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/133 : Kepler Input Catalog (Kepler Mission Team, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/670/A24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/670/A24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/670/A24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/670/A24https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/670/A24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/670/A24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/670/A24/tablef1 (Stellar and flicker characteristics of the targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/670/A24/tablef1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/670/A24/tablef1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/670/A24/tablef1?GETtext/xml+votable180.050000true121.7521667-29.40291670.0055555555555555565/3645 3647 3688 3690-3691 3693 3695 3730 3732-3734 3740 3743 3779-3780 6/14573 14578 14585 14587 14730 14734-14735 14744 14746 14751 14756-14757 14759 14770 14777-14779 14794-14795 14818-14819 14824-14826 14914 14917-14918 14925-14927 14941-14942 14945 14947-14948 14950-14951 14955 14958-14959 14965-14967 14969 14971 15041 15060-15061 15104-15106 15108-15110 15112-15113 15115 15124 15128 15136-15138 15140-15141 15144 15146 39767 402833.322582951404819e-19 3.852589004194616e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/670/A24?format=asciiOpticaldefaultJ/A+A/670/A24/tablef1Stellar and flicker characteristics of the targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTargetName of the targetmeta.id;meta.maincharSimbadSimbad column added by the CDSmeta.ref.urlcharMissionCHEOPS or Keplermeta.id;instrcharFreqcCorner frequencyuHzem.freqdoubleFreqgFlicker frequencyuHzem.freqdoublestd-wgnStandard deviation of the white Gaussian noise(10-6)stat.stdevdoubleagFlicker indexsrc.var.indexdoublee_agFlicker index uncertaintystat.errordoubleag-30ppm? Flicker index interpolated at 30ppmsrc.var.indexdoublenullableMstarStellar masssolMassphys.massdoublee_MstarStellar mass uncertaintysolMassstat.errordoubleRstarStellar radiussolRadphys.size.radiusdoublee_RstarStellar radius uncertaintysolRadstat.errordoubleTeffStellar TeffKphys.temperature.effectivedoublee_TeffStellar Teff uncertaintyKstat.error;phys.temperature.effectivedoubleloggStellar surface gravityphys.gravitydoublee_loggStellar surface gravity uncertaintystat.errordoubleVmagStellar apparent magnitude in the V-bandmagphot.mag;em.opt.Vfloat_RAPositions from Simbad and KIC (right ascension part)degpos.eq.ra;meta.main_DEPositions from Simbad and KIC (declination part)degpos.eq.dec;meta.mainJ/A+A/670/A24/hd67458HD67458 CHEOPS light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBaricentric Julian date (BJD)dtime.epochdoubleRFluxRelative fluxphot.flux;arith.ratiodoublee_RFluxFlux errorstat.errordoubleJ/A+A/670/A24/hd88595HD88595 CHEOPS light curverecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeBaricentric Julian date (BJD)dtime.epochdoubleRFluxRelative fluxphot.flux;arith.ratiodoublee_RFluxFlux errorstat.errordouble