J/A+A/677/A112ivo://CDS.VizieR/J/A+A/677/A112doi:10.26093/cds/vizier.36770112CDSMeier Valdes E.A.Morris B.M.Demory B.-O.Brandeker A.Kitzmann D.,Benz W.Deline A.Floren H.-G.Sousa S. G.Bourrier V.Singh V.,Heng K.Strugarek A.Bower D. J.Jaeggi N.Carone L.Lendl M.,Jones K.Oza A.V.Demangeon O.D.S.Alibert Y.Alonso R.,Anglada G.Asquier J.Barczy T.Barrado Navascues D.Barros S.C.C.,Baumjohann W.Beck M.Beck T.Billot N.Bonfils X.Borsato L.,Broeg C.Cabrera J.Charnoz S.Collier Cameron A.Csizmadia Sz.,Cubillos P. E.Davies M. B.Deleuil M.Delrez L.Ehrenreich D.,Erikson A.Fortier A.Fossati L.Fridlund M.Gandolfi D.Gillon M.,Guedel M.Guenther M.N.Hoyer S.Isaak K. G.Kiss L. L.Laskar J.,Lecavelier des Etangs A.Lovis C.Magrin D.Maxted P.F.L.,Mordasini C.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.Santos N. C.Sarajlic M.Scandariato G.,Segransan D.Sicilia D.Simon A.E.Smith A.M.S.Steller M.,Szabo Gy.M.Thomas N.Udry S.Ulmer B.Van Grootel V.Venturini J.,Walton N.A.Wilson T.G.Wolter D.2024-11-06T20:05:41Z2023-09-13T08:09:33ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsphotometryvisible-astronomy55 Cnc e is an ultra-short period super-Earth transiting a Sun-like star. Past observations in the optical range detected a time-variable flux modulation phased with the planetary orbital period whose amplitude is too large to be explained by reflected light and thermal emission alone. The goal of the study is to investigate the origin of the variability and timescale of 55 Cnc e's phase curve modulation. To that end, we used the CHaracterising ExOPlanet Satellite (CHEOPS) whose exquisite photometric precision provides an opportunity to characterise minute changes in the phase curve from orbit to orbit. CHEOPS observed 29 individual visits of 55 Cnc e between March 2020 and February 2022. Based on these observations, we investigate the different processes that could be at the origin of the observed modulation. In particular, we build a toy model to assess whether a circumstellar torus of dust driven by radiation pressure and gravity could match the observed flux variability timescale. We find that 55 Cnc e's phase curve amplitude and peak offset do vary between visits. The sublimation timescales of selected dust species reveal that silicates expected in an Earth-like mantle would not survive long enough to explain the observed phase curve modulation. We find that silicon carbide, quartz and graphite are plausible candidates for the circumstellar torus composition due to their long sublimation timescales. The extensive CHEOPS observations confirm that the phase curve amplitude and offset vary in time. We find that dust could provide the grey opacity source required to match the observations. However, the data at hand do not provide evidence that circumstellar material with variable grain mass per unit area is actually causing the observed variability. Future observations with JWST promise exciting insights on this iconic super-Earth.2023A&A...677A.112Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/677/A112CatalogResearchIsServedByTAP VizieR generic servicerelated-tohttps://cheops-archive.astro.unige.ch/archive_browser/ : CHEOPS archive browserhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/677/A112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/677/A112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/677/A112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/677/A112https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/677/A112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/677/A112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/677/A112/rawCHEOPS raw photometric time-series with detrending variablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTimeTime (BJD-2450000) (TDB)dtime.epochdoubleindexedFluxNormalised raw fluxphot.flux;arith.ratiodoublee_Flux1-sigma uncertainty in normalised fluxstat.error;phot.fluxdoublerollRoll angledeginstr.offsetdoublebgBackgroundinstr.backgrounddoublexX-centroid positionpixpos;instr.detdoubleyY-centroid positionpixpos;instr.detdoublethermThermistor readout ThermFront2Kphys.temperaturedoubleJ/A+A/677/A112/detrendCHEOPS detrended photometric time-seriesTimeTime (BJD-2450000) (TDB)dtime.epochdoubleindexedFluxNormalised detrended fluxphot.flux;arith.ratiodoublee_Flux[] 1-sigma uncertainty in normalised detrended fluxstat.error;phot.fluxdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint