J/ApJ/876/L24ivo://CDS.VizieR/J/ApJ/876/L24doi:10.26093/cds/vizier.18769024CDSGandolfi D.Fossati L.Livingston J.H.Stassun K.G.Grziwa S.,Barragan O.Fridlund M.Kubyshkina D.Persson C.M.Dai F.Lam K.W.F.,Albrecht S.Batalha N.Beck P.G.Bo Justesen A.Cabrera J.,Cartwright S.Cochran W.D.Csizmadia S.Davies M.D.Deeg H.J.,Eigmuller P.Endl M.Erikson A.Esposito M.Garcia R.A.Goeke R.,Gonzalez-Cuesta L.Guenther E.W.Hatzes A.P.Hidalgo D.Hirano T.,Hjorth M.Kabath P.Knudstrup E.Korth J.Li J.Luque R.Mathur S.,Montanes Rodriguez P.Narita N.Nespral D.Niraula P.Nowak G.,Palle E.Patzold M.Prieto-Arranz J.Rauer H.Redfield S.Ribas I.,Skarka M.Smith A.M.S.Rowden P.Torres G.Van Eylen V.Vezie M.L.2021-09-09T09:44:12Z2020-12-02T15:13:05ZCDS support team

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

cds-question@unistra.frk-starsradial-velocityvisible-astronomyspectroscopyWe report the discovery of a super-Earth and a sub-Neptune transiting the star HD 15337 (TOI-402, TIC 120896927), a bright (V=9) K1 dwarf observed by the Transiting Exoplanet Survey Satellite (TESS) in Sectors 3 and 4. We combine the TESS photometry with archival High Accuracy Radial velocity Planet Searcher spectra to confirm the planetary nature of the transit signals and derive the masses of the two transiting planets. With an orbital period of 4.8d, a mass of 7.51_-1.01^+1.09^M{Earth}_ and a radius of 1.64+/-0.06R_{Earth}_, HD15337b joins the growing group of short-period super-Earths known to have a rocky terrestrial composition. The sub-Neptune HD15337c has an orbital period of 17.2d, a mass of 8.11_-1.69_^+1.82^M_{Earth}_, and a radius of 2.39+/-0.12R_{Earth}_, suggesting that the planet might be surrounded by a thick atmospheric envelope. The two planets have similar masses and lie on opposite sides of the radius gap, and are thus an excellent testbed for planet formation and evolution theories. Assuming that HD15337c hosts a hydrogen-dominated envelope, we employ a recently developed planet atmospheric evolution algorithm in a Bayesian framework to estimate the history of the high-energy (extreme ultraviolet and X-ray) emission of the host star. We find that at an age of 150Myr, the star possessed on average between 3.7 and 127 times the high-energy luminosity of the current Sun.2019ApJ...876L..24Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/876/L24CatalogResearchIsServedByTAP VizieR generic servicerelated-toI/259 : The Tycho-2 Catalogue (Hog+ 2000)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/312 : GALEX-DR5 (GR5) sources from AIS and MIS (Bianchi+ 2011)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJS/159/141 : Spectroscopic properties of cool stars. I. (Valenti+, 2005)J/ApJ/687/1264 : Age estimation for solar-type dwarfs (Mamajek+, 2008)J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)J/ApJ/726/L19 : Gunn r photometry of WASP-30 (Anderson+, 2011)J/PASP/124/1279 : Q3 Kepler's combined photometry (Christiansen+, 2012)J/A+A/566/A66 : logIH{alpha} & logR'HK correlation (Gomes da Silva+, 2014)J/A+A/580/A23 : Stroemgren-Crawford uvby{beta} photometry (Paunzen, 2015)J/AJ/152/204 : HARPS-N radial velocities of HD 179070 (Lopez-Morales+, 2016)J/AJ/152/180 : Bol. fluxes of eclipsing binaries in Tycho-2 (Stassun+, 2016)J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)J/AJ/154/109 : CKS. III. Planet radii (Fulton+, 2017)J/AJ/154/123 : RV follow-up of the HD 3167 system (Gandolfi+, 2017)J/A+A/608/A93 : K2-106 radial velocities measurements (Guenther+, 2017)J/AJ/153/136 : Planets & host stars with Gaia parallaxes (Stassun+, 2017)J/A+A/612/A95 : K2-141 b radial velocity and light curve (Barragan+, 2018)J/A+A/619/L10 : pi Men radial velocity curves (Gandolfi+, 2018)J/AJ/156/102 : TESS Input Catalog and Candidate Target List (Stassun+, 2018)J/A+A/622/L7 : GJ143 and HD23472 radial velocity curves (Trifonov+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/876/L24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/876/L24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/876/L24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/876/L24https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/876/L24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/876/L24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/ApJ/876/L24/rvelCombined table from original tablesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJD[2988.6/8002.9] Barycentric Julian Date in barycentric dynamical time (BDT), BJD-2450000dtime.epochdoubleFlagExclusion flag; *=outlier not included in the analysismeta.code.errorcharRV[-3.83/-1.6] Radial Velocitykm/sphys.veloc;pos.heliocentricfloate_RV[0.0005/0.04] Uncertainty in RVkm/sstat.errorfloatBIS[-0.003/0.12] Bisector spankm/sphys.velocfloatFWHM[6.1/6.4] Full-width at half-maximumkm/sspect.line.widthfloatTexp[5/1500] Exposure timestime.duration;obs.exposureintS/N[3.8/142.1] S/N per pixel at 550nmstat.snrfloatFiberData acquired with the old (Table 2) or new (Table 3) fiber bundleinstr.setupchar