J/ApJ/786/2ivo://CDS.VizieR/J/ApJ/786/2doi:10.26093/cds/vizier.17860002CDSVan Grootel V.Gillon M.Valencia D.Madhusudhan N.Dragomir D.,Howe A.R.Burrows A.S.Demory B.-O.Deming D.Ehrenreich D.Lovis C.,Mayor M.Pepe F.Queloz D.Scuflaire R.Seager S.Segransan D.,Udry S.2017-09-04T08:19:10Z2017-08-04T08:58:52ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsinfrared-photometryeclipsing-binary-starsSuper-Earths transiting nearby bright stars are key objects that simultaneously allow for accurate measurements of both their mass and radius, providing essential constraints on their internal composition. We present here the confirmation, based on Spitzer transit observations, that the super-Earth HD 97658 b transits its host star. HD 97658 is a low-mass (M_*_=0.77+/-0.05 M_{sun}_) K1 dwarf, as determined from the Hipparcos parallax and stellar evolution modeling. To constrain the planet parameters, we carry out Bayesian global analyses of Keck-High Resolution Echelle Spectrometer (Keck-HIRES) radial velocities and Microvariability and Oscillations of STars (MOST) and Spitzer photometry. HD 97658 b is a massive (M_p_=7.55_-0.79_^+0.83^ M_{earth}_) and large (R_p_=2.247_0.095_^+0.098^ R_{earth}_ at 4.5 {mu}m) super-Earth. We investigate the possible internal compositions for HD 97658 b. Our results indicate a large rocky component, of at least 60% by mass, and very little H-He components, at most 2% by mass. We also discuss how future asteroseismic observations can improve the knowledge of the HD 97658 system, in particular by constraining its age. Orbiting a bright host star, HD 97658 b will be a key target for upcoming space missions such as the Transiting Exoplanet Survey Satellite (TESS), the Characterizing Exoplanet Satellite (CHEOPS), the Planetary Transits and Oscillations of stars (PLATO), and the James Webb Space Telescope to characterize thoroughly its structure and atmosphere.2014ApJ...786....2Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/786/2CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/759/L41 : New radial velocities of HD 97658 (Dragomir+, 2012)J/ApJ/772/L2 : Keck/HIRES radial velocities for HD 97658 (Dragomir+, 2013)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/786/2https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/786/2http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/786/2https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/786/2https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/786/2http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/786/2GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/ApJ/786/2/table1Spitzer photometric time series of HD 97658, as used by our MCMC algorithmrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date; UTC (BJD-2450000)dtime.epochdoubleFluxNormalized Spitzer/IRAC 4.5 micron fluxphot.flux;arith.ratiodoublee_FluxError in Fluxstat.error;phot.fluxdoubledXSpitzer X pixel coordinatepixpos.cartesian.xdoubledYSpitzer Y pixel coordinatepixpos.cartesian.ydoubleFWHMFWHM of sourcepixphys.angSizefloatFWHMXX component of FWHMpixphys.angSize.smajAxisdoubleFWHMYY component of FWHMpixphys.angSize.sminAxisdoubleSkySky brightness in electronsmeta.notedouble