J/AJ/154/123ivo://CDS.VizieR/J/AJ/154/123doi:10.26093/cds/vizier.51540123CDSGandolfi D.Barragan O.Hatzes A.P.Fridlund M.Fossati L.Donati P.,Johnson M.C.Nowak G.Prieto-Arranz J.Albrecht S.Dai F.Deeg H.,Endl M.Grziwa S.Hjorth M.Korth J.Nespral D.Saario J.,Smith A.M.S.Antoniciello G.Alarcon J.Bedell M.Blay P.Brems S.S.,Cabrera J.Csizmadia S.Cusano F.Cochran W.D.Eigmuller P.Erikson A.,Gonzalez Hernandez J.I.Guenther E.W.Hirano T.Suarez Mascareno A.,Narita N.Palle E.Parviainen H.Patzold M.Persson C.M.Rauer H.,Saviane I.Schmidtobreick L.Van Eylen V.Winn J.N.Zakhozhay O.V.2018-09-25T13:17:22Z2018-06-12T13:28:43ZCDS support team

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

cds-question@unistra.frk-starsexoplanetsradial-velocityspectroscopyHD 3167 is a bright (V=8.9 mag) K0 V star observed by NASA's K2 space mission during its Campaign 8. It has recently been found to host two small transiting planets, namely, HD 3167b, an ultra-short-period (0.96 days) super-Earth, and HD 3167c, a mini-Neptune on a relatively long-period orbit (29.85 days). Here we present an intensive radial velocity (RV) follow-up of HD 3167 performed with the FIES@NOT, HARPS@ESO-3.6 m, and HARPS-N@TNG spectrographs. We revise the system parameters and determine radii, masses, and densities of the two transiting planets by combining the K2 photometry with our spectroscopic data. With a mass of 5.69+/-0.44 M_{Earth}_, a radius of 1.574+/-0.054 R_{Earth}_, and a mean density of 8.00_-0.98_^+1.10^ g/cm^3^, HD 3167b joins the small group of ultra-short-period planets known to have rocky terrestrial compositions. HD 3167c has a mass of 8.33_-1.85_^+1.79^ M_{Earth}_ and a radius of 2.740_-0.100_^+0.106^ R_{Earth}_, yielding a mean density of 2.21_-0.53_^+0.56^ g/cm^3^, indicative of a planet with a composition comprising a solid core surrounded by a thick atmospheric envelope. The rather large pressure scale height (~350 km) and the brightness of the host star make HD 3167c an ideal target for atmospheric characterization via transmission spectroscopy across a broad range of wavelengths. We found evidence of additional signals in the RV measurements but the currently available data set does not allow us to draw any firm conclusions on the origin of the observed variation.2017AJ....154..123Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/123CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/787/47 : 106 Kepler ultra-short-period planets (Sanchis-Ojeda+, 2014)J/ApJ/829/L9 : K2 LC of HD 3167 and Robo-AO image (Vanderburg+, 2016)J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)J/AJ/154/122 : Radial velocities for the HD 3167 system (Christiansen+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/123https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/123http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/123https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/123https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/123http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/123GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/154/123/table5FIES, HARPS, and HARPS-N Radial Velocity Measurements and Activity Indicators of HD 3167recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument (HARPS, FIES, HARPS-N)meta.id;instrcharBJDBarycentric Julian Date (TDB, BJD-2450000)dtime.epochdoubleRV[-0.0178/19.5317] Radial velocity (1)km/sphys.veloc;pos.heliocentricfloate_RV[0.0004/0.0031] Uncertainty in RVkm/sstat.errorfloatBIS[-0.0415/-0.0246]? Cross-correlation function bisector spankm/sphys.velocfloatnullableFWHM[6.7021/6.788]? Cross-correlation function Full-Width at Half Maximumkm/sstat.correlationfloatnullablelogRHK[-5.126/-4.995]? Log Ca II H & K chromospheric activity index log R'_HK_phot.flux;arith.ratiofloatnullablee_logRHK[0.004/0.02]? Uncertainty in logRHKstat.errorfloatnullableS/N[60.5/159.0] Signal-to-noise ratio per pixel at 5500 {AA}stat.snr;instr.pixelfloat