J/AJ/154/122ivo://CDS.VizieR/J/AJ/154/122doi:10.26093/cds/vizier.51540122CDSChristiansen J.L.Vanderburg A.Burt J.Fulton B.J.Batygin K.,Benneke B.Brewer J.M.Charbonneau D.Ciardi D.R.Cameron A.C.,Coughlin J.L.Crossfield I.J.M.Dressing C.Greene T.P.Howard A.W.,Latham D.W.Molinari E.Mortier A.Mullally F.Pepe F.Rice K.,Sinukoff E.Sozzetti A.Thompson S.E.Udry S.Vogt S.S.Barman T.S.,Batalha N.E.Bouchy F.Buchhave L.A.Butler R.P.Cosentino R.,Dupuy T.J.Ehrenreich D.Fiorenzano A.Hansen B.M.S.Henning T.,Hirsch L.Holden B.P.Isaacson H.T.Johnson J.A.Knutson H.A.,Kosiarek M.Lopez-Morales M.Lovis C.Malavolta L.Mayor M.Micela G.,Motalebi F.Petigura E.Phillips D.F.Piotto G.Rogers L.A.,Sasselov D.Schlieder J.E.Segransan D.Watson C.A.Weiss L.M.2018-09-25T13:14:16Z2018-06-12T13:18:54ZCDS support team

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

cds-question@unistra.frexoplanetsradial-velocityHD 3167 is a bright (V=8.9), nearby K0 star observed by the NASA K2 mission (EPIC 220383386), hosting two small, short-period transiting planets. Here we present the results of a multi-site, multi-instrument radial-velocity campaign to characterize the HD 3167 system. The masses of the transiting planets are 5.02+/-0.38 M_{earth}_ for HD 3167 b, a hot super-Earth with a likely rocky composition ({rho}_b_=5.60_-1.43_^+2.15^ g/cm^3^), and 9.80_-1.24_^+1.30^ M_{earth}_ for HD 3167 c, a warm sub-Neptune with a likely substantial volatile complement ({rho}_c_=1.97_-0.59_^+0.94^ g/cm^3^). We explore the possibility of atmospheric composition analysis and determine that planet c is amenable to transmission spectroscopy measurements, and planet b is a potential thermal emission target. We detect a third, non-transiting planet, HD 3167 d, with a period of 8.509+/-0.045 d (between planets b and c) and a minimum mass of 6.90+/-0.71 M_{earth}_. We are able to constrain the mutual inclination of planet d with planets b and c: we rule out mutual inclinations below 1.3{deg} because we do not observe transits of planet d. From 1.3{deg} to 40{deg}, there are viewing geometries invoking special nodal configurations, which result in planet d not transiting some fraction of the time. From 40{deg} to 60{deg}, Kozai-Lidov oscillations increase the system's instability, but it can remain stable for up to 100 Myr. Above 60{deg}, the system is unstable. HD 3167 promises to be a fruitful system for further study and a preview of the many exciting systems expected from the upcoming NASA TESS mission.2017AJ....154..122Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/122CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJ/829/L9 : K2 LC of HD 3167 and Robo-AO image (Vanderburg+, 2016)J/ApJ/830/46 : Radial velocities of 3 Neptune-mass planet hosts (Fulton+, 2016)J/AJ/153/208 : LCES HIRES/Keck radial velocity Exoplanet Survey (Butler+, 2017)J/AJ/154/123 : Radial velocity follow-up of the HD 3167 systemhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/122https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/122http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/122https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/122https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/122http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/122GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/AJ/154/122/table2Radial Velocities for HD 3167recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[17576.70031/17728.4833] Heliocentric Julian Date (HJD-2440000) UTCdtime.epochdoubleRV[-14.91/19534.88] Radial velocity (1)m/sphys.veloc;pos.heliocentricdoublee_RV[0.52/2.73] Uncertainty in RV (2)m/sstat.errorfloatInstInstrument (APF, HARPSN, HIRES or APFS)meta.id;instrchar