J/AJ/162/238ivo://CDS.VizieR/J/AJ/162/238doi:10.26093/cds/vizier.51620238CDSPolanski A.S.Crossfield I.J.M.Burt J.A.Nowak G.Lopez-morales M.,Mortier A.Poretti E.Behmard A.Benneke B.Blunt S.Bonomo A.S.,Butler R.P.Chontos A.Cosentino R.Crane J.D.Dumusque X.,Fulton B.J.Ghedina A.Gorjian V.Grunblatt S.K.Harutyunyan A.,Howard A.W.Isaacson H.Kosiarek M.R.Latham D.W.Luque R.,Martinez Fiorenzano A.F.Mayor M.Mills S.M.Molinari E.Nagel E.,Palle E.Petigura E.A.Shectman S.A.Sozzetti A.Teske J.K.Wang S.X.,Weiss L.M.2022-09-30T21:51:29Z2022-03-04T07:15:19ZCDS support team

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

cds-question@unistra.frdwarf-starsk-starsradial-velocityvisible-astronomyUsing radial-velocity measurements from four instruments, we report the mass and density of a 2.043{+/-}0.069R{Earth} sub-Neptune orbiting the quiet K-dwarf Wolf503 (HIP67285). In addition, we present improved orbital and transit parameters by analyzing previously unused short-cadence K2 campaign 17 photometry and conduct a joint radial-velocity-transit fit to constrain the eccentricity at 0.41{+/-}0.05. The addition of a transit observation by Spitzer also allows us to refine the orbital ephemeris in anticipation of further follow-up. Our mass determination, 6.26_-0.70_^+0.69^M{Earth} , in combination with the updated radius measurements, gives Wolf503b a bulk density of {rho}=2.92_-0.44_^+0.50^g/cm^3^. Using interior composition models, we find this density is consistent with an Earth-like core with either a substantial H_2_O mass fraction (45_-16_^+19^%) or a modest H/He envelope (0.5%{+/-}0.3%). The low H/He mass fraction, along with the old age of Wolf503 (11{+/-}2Gyr), makes this sub-Neptune an opportune subject for testing theories of XUV-driven mass loss while the brightness of its host (J=8.3mag) makes it an attractive target for transmission spectroscopy.2021AJ....162..238Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/162/238CatalogResearchIsServedByTAP VizieR generic servicerelated-toIII/159 : Ca II H and K Measurements Made at MWO (Duncan+ 1991)II/335 : Revised catalog of GALEX UV sources (Bianchi+ 2017)J/A+A/526/A112 : Radial velocities of HARPS metal-poor sample (Santos+, 2011)J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)J/ApJ/734/70 : Chromospheric activity of Southern stars (Arriagada, 2011)J/ApJ/754/136 : Light curves of HD 149026b in 3.6-16um (Stevenson+, 2012)J/AJ/145/102 : Spectroscopy of bright M dwarfs in northern sky (Lepine+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/ApJ/831/64 : Mass-metallicity relation for giant planets (Thorngren+, 2016)J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)J/AJ/154/228 : Properties of transiting planet's host stars (Sandford+, 2017)J/ApJ/844/102 : KIC star plxs from asteroseismology vs Gaia (Huber+, 2017)J/A+A/609/A117 : CARMENES radial velocity curves of 7 M-dwarf (Trifonov+, 2018)J/A+A/618/A115 : HD 147379 radial velocities (Kaminski+, 2018)J/AJ/155/89 : California-Kepler Survey (CKS). IV. Planets (Petigura+, 2018)J/ApJ/872/17 : HAZMAT. V. UV & X-ray evolution K stars (Richey-Yowell+, 2019)J/A+A/636/A36 : Absolute radial velocities CARMENES M dwarfs (Lafarga+, 2020)J/AJ/159/239 : Transmission Spectroscopy Metric of exoplanets (Guo+, 2020)J/AJ/159/280 : Gaia-Kepler stellar properties cat.I. KIC stars (Berger+, 2020)J/AJ/161/70 : Radial velocities WASP-107 with HIRES & CORALIE (Piaulet+, 2021)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/162/238https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/162/238http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/162/238https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/162/238https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/162/238http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/162/238GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/162/238/table3Radial velocities and S_HK_ valuesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2458262/2458926] Barycentric Julian Date; TDBdtime.epochdoubleRVel[-46766/17] Radial velocitym/sphys.veloc;pos.heliocentricdoublee_RVel[0.6/7] Uncertainty in RVelm/sstat.error;spect.dopplerVelocfloatSHK[0.2/0.35]? Mt. Wilson S_HK_ indexspect.indexfloatnullablee_SHK[0.001/0.05]? Uncertainty in SHKstat.errorfloatnullableInstInstrument; CARMENES, HARPS, HIRES or PFSinstrchar