J/AJ/160/192ivo://CDS.VizieR/J/AJ/160/192doi:10.26093/cds/vizier.51600192CDSStefansson G.Mahadevan S.Maney M.Ninan J.P.Robertson P.,Rajagopal J.Haase F.Allen L.Ford E.B.Winn J.Wolfgang A.,Dawson R.I.Wisniewski J.Bender C.F.Canas C.Cochran W.,Diddams S.A.Fredrick C.Halverson S.Hearty F.Hebb L.Kanodia S.,Levi E.Metcalf A.J.Monson A.Ramsey L.Roy A.Schwab C.Terrien R.,Wright J.T.2022-09-09T12:13:03Z2020-12-04T07:51:26ZCDS support team

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

cds-question@unistra.frexoplanetsdwarf-starsinfrared-photometryradial-velocityUsing radial velocity data from the Habitable Zone Planet Finder, we have measured the mass of the Neptune-sized planet K2-25b, as well as the obliquity of its M4.5 dwarf host star in the 600-800Myr Hyades cluster. This is one of the youngest planetary systems for which both of these quantities have been measured and one of the very few M dwarfs with a measured obliquity. Based on a joint analysis of the radial velocity data, time-series photometry from the K2 mission, and new transit light curves obtained with diffuser-assisted photometry, the planet's radius and mass are 3.44{+/-}0.12R_{Earth}_ and 24.5_-5.2_^+5.7^M_{Earth}_. These properties are compatible with a rocky core enshrouded by a thin hydrogen-helium atmosphere (5% by mass). We measure an orbital eccentricity of e=0.43{+/-}0.05. The sky-projected stellar obliquity is {lambda}=3{deg}{+/-}16{deg}, compatible with spin- orbit alignment, in contrast to other "hot Neptunes" that have been studied around older stars.2020AJ....160..192Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/192CatalogResearchIsServedByTAP VizieR generic servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/289 : UCAC2 Catalogue (Zacharias+ 2004)I/298 : LSPM-North Catalog (Lepine+ 2005)II/328 : AllWISE Data Release (Cutri+ 2013)J/AJ/128/463 : A preliminary 20pc census from the NLTT catalogue (Reid+,2004)J/ApJ/703/L99 : Outlandish orbit of HAT-P-7b (Winn+, 2009)J/ApJ/723/L223 : Radial velocities of HAT-P-11 (Winn+, 2010)J/ApJ/757/18 : Radial velocities 16 hot Jupiter host stars (Albrecht+, 2012)J/ApJS/200/15 : HARPS-TERRA project. I. (Anglada-Escude+, 2012)J/AJ/143/93 : Rotational velocities in early-M stars (Reiners+, 2012)J/ApJ/807/45 : Potentially habit. planets orbiting M dwarfs (Dressing+, 2015)J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)J/ApJ/801/3 : Rotation periods for Q3-Q14 KOIs (Mazeh+, 2015)J/ApJS/224/2 : K2 EPIC stellar properties for 138600 targets (Huber+, 2016)J/AJ/152/204 : HARPS-N radial velocities of HD 179070 (Lopez-Morales+, 2016)J/ApJ/825/19 : Mass-radius relation for planets with Rp<4 (Wolfgang+, 2016)J/ApJ/834/17 : Mass & radius of planets, moons, low mass stars (Chen+, 2017)J/AJ/154/226 : Photometry and radial velocities of K2-131 (Dai+, 2017)J/AJ/153/142 : RVs of systems hosting sub-Saturns (Petigura+, 2017)J/ApJ/836/77 : Library of high-S/N optical spectra of FGKM stars (Yee+, 2017)J/AJ/155/203 : HARPS-N RVs & activity indicators Kepler-1655 (Haywood+, 2018)J/AJ/158/75 : Mid-type M dwarfs planet occurrence (Hardegree-Ullman+, 2019)J/ApJ/871/63 : How to constrain your M dwarf II. Nearby binaries (Mann+,2019)J/AJ/159/63 : New AO obs. of exoplanets & brown dwarf comp. (Bowler+, 2020)J/AJ/159/83 : Transit analysis for the K2-25 system (Kain+, 2020)J/AJ/159/100 : Flux & RVs of the dwarf G9-40 with K2 & HPF (Stefansson+,2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/192https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/160/192http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/160/192https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/160/192https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/160/192http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/160/192GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfrareddefaultJ/AJ/160/192/fig2K2 light curve and ground-based transitsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument identifier (1)meta.id;instrcharBJD[2457061/2458516] Barycentric Julian Date flux-weighted midpointdtime.epochdoubleFlux[0.96/1.03] Normalized photometric fluxphot.flux;arith.ratiodoublee_Flux[0.0007/0.03] Error in FLuxstat.error;phot.fluxdoubleModel[0.97/1.03] Best-fit Transit model (2)stat.param;meta.modelleddoubleGP[0.97/1.03] Gaussian-Process red noise component of the best-fit modelinstr.det.noisedoubleJ/AJ/160/192/tablec1Out-of-transit RVs from HPFIRT2Line number 2 CaII Infrared Triplet line activity indicatorphys.emissivityfloate_IRT2Error in IRT2stat.errorfloatIRT3Line number 3 CaII Infrared Triplet line activity indicatorphys.emissivityfloate_IRT3Error in IRT3stat.errorfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date (1)dtime.epochdoubleRVelRadial velocitym/sphys.veloc;pos.heliocentricfloate_RVelError in RVelm/sstat.error;spect.dopplerVelocfloatdLWDifferential line width indicatorm**2.s**-2spect.line.width;arith.difffloate_dLWError in dLWm**2.s**-2stat.errorfloatCRXChromatic activity indicator (2)meta.codefloate_CRXError in CRX (2)stat.errorfloatIRT1Line number 1 CaII Infrared Triplet line activity indicatorphys.emissivityfloate_IRT1Error in IRT1stat.errorfloatJ/AJ/160/192/tablec2In-transit RVs from HPFrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian Date (1)dtime.epochdoubleRVelRadial velocitym/sphys.veloc;pos.heliocentricdoublee_RVelError estimate in RVelm/sstat.error;spect.dopplerVelocfloatS/NSignal-to-noise ratio of observationobs.param;obsfloatTransitTransit identifier (2)meta.codeint