J/AJ/161/47ivo://CDS.VizieR/J/AJ/161/47doi:10.26093/cds/vizier.51610047CDSKosiarek M.R.Berardo D.A.Crossfield I.J.M.Laguna C.Piaulet C.,Akana Murphy J.M.Howell S.B.Henry G.W.Isaacson H.Fulton B.,Weiss L.M.Petigura E.A.Behmard A.Hirsch L.A.Teske J.Burt J.A.,Mills S.M.Chontos A.Mocnik T.Howard A.W.Werner M.Livingston J.H.,Krick J.Beichman C.Gorjian V.Kreidberg L.Morley C.,Christiansen J.L.Morales F.Y.Scott N.J.Crane J.D.Wang S.X.,Shectman S.A.Rosenthal L.J.Grunblatt S.K.Rubenzahl R.A.Dalba P.A.,Giacalone S.Villanueva C.D.Liu Q.Dai F.Hill M.L.Rice M.,Kane S.R.Mayo A.W.2022-09-30T21:41:06Z2021-03-23T08:20:10ZCDS support team

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

cds-question@unistra.frexoplanetsradial-velocityinfrared-photometryvisible-astronomyphotometryHD106315 and GJ9827 are two bright, nearby stars that host multiple super-Earths and sub-Neptunes discovered by K2 that are well suited for atmospheric characterization. We refined the planets ephemerides through Spitzer transits, enabling accurate transit prediction required for future atmospheric characterization through transmission spectroscopy. Through a multiyear high-cadence observing campaign with Keck/High Resolution Echelle Spectrometer and Magellan/Planet Finder Spectrograph, we improved the planets mass measurements in anticipation of Hubble Space Telescope transmission spectroscopy. For GJ9827, we modeled activity-induced radial velocity signals with a Gaussian process informed by the CalciumII H&K lines in order to more accurately model the effect of stellar noise on our data. We measured planet masses of Mb=4.87{+/-}0.37M{Earth}, Mc=1.92{+/-}0.49M{Earth}, and Md=3.42{+/-}0.62M{Earth}. For HD 06315, we found that such activity radial velocity decorrelation was not effective due to the reduced presence of spots and speculate that this may extend to other hot stars as well (Teff>6200K). We measured planet masses of Mb=10.5{+/-}3.1M{Earth} and Mc=12.0{+/-}3.8M{Earth}. We investigated all of the planets compositions through comparison of their masses and radii to a range of interior models. GJ9827b and GJ9827c are both consistent with a 50/50 rock-iron composition, GJ9827d and HD106315b both require additional volatiles and are consistent with moderate amounts of water or hydrogen/helium, and HD106315c is consistent with a ~10% hydrogen/helium envelope surrounding an Earth-like rock and iron core.2021AJ....161...47Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/47CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/337 : Gaia DR1 (Gaia Collaboration, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011)J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)J/ApJ/764/3 : H{alpha} indices in M low-mass stars (Robertson+, 2013)J/ApJ/805/175 : Keck and APF radial velocities of HD7924 (Fulton+, 2015)J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)J/ApJ/844/102 : KIC star plxs from asteroseismology vs Gaia (Huber+, 2017)J/A+A/603/L5 : HD106315c I light curve (Lendl+, 2017)J/AJ/154/107 : California-Kepler Survey. I. 1305 stars (Petigura+, 2017)J/ApJ/836/77 : Library of high-S/N optical spectra FGKM stars (Yee+, 2017)J/MNRAS/484/3731 : GJ 9827 HARPS-N RV data (Rice+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/47https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/47http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/47https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/47https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/47http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/47GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.762881831355591e-19 3.3785437584409506e-19OpticalInfrareddefaultJ/AJ/161/47/rvCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharBJDBarycentric Julian Date; TDBdtime.epochdoubleRVelRadial velocitym/sphys.veloc;pos.heliocentricfloate_RVelUncertainty in RVelm/sstat.error;phys.velocfloatSHK? Calcium II H&K lines index (1)meta.code.multipfloatnullableHa? H{alpha} indexspect.indexdoublenullableInstInstrument used; HIRES, APF or PFSinstr.setupcharJ/AJ/161/47/photoCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDStar identifiermeta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoubleRmagDifferential Cousins R band magnitudemagphot.mag;em.opt.Rdouble