J/AJ/160/255ivo://CDS.VizieR/J/AJ/160/255doi:10.26093/cds/vizier.51600255CDSJung Y.K.Udalski A.Zang W.Bond I.A.Yee J.C.Han C.Albrow M.D.,Chung S.-J.Gould A.Hwang K.-H.Ryu Y.-H.Shin I.-G.Shvartzvald Y.,Cha S.-M.Kim D.-J.Kim H.-W.Kim S.-L.Lee C.-U.Lee D.-J.Lee Y.,Park B.-G.Pogge R.W.Mroz P.Szymanski M.K.Skowron J.Poleski R.,Soszynski I.Pietrukowicz P.Kozlowski S.Ulaczyk K.Rybicki K.A.,Iwanek P.Wrona M.Abe F.Barry R.Bennett D.P.Bhattacharya A.,Donachie M.Fujii H.Fukui A.Hirao Y.Itow Y.Kamei Y.Kondo I.,Koshimoto N.Li M.C.A.Matsubara Y.Miyazaki S.Muraki Y.Nagakane M.,Ranc C.Rattenbury N.J.Satoh Y.Shoji H.Suematsu H.Sullivan D.J.,Sumi T.Suzuki D.Tristram P.J.Yamakawa T.Yamamwaki T.Yonehara A.2022-03-08T08:51:04Z2021-02-17T05:46:33ZCDS support team

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

cds-question@unistra.frexoplanetsgravitational-lensinginfrared-photometryvisible-astronomyphotometryWe report the discovery of a cold planet with a very low planet/host mass ratio of q=(4.09{+/-}0.27)x10^-5^, which is similar to the ratio of Uranus/Sun (q=4.37x10^-5^) in the solar system. The Bayesian estimates for the host mass, planet mass, system distance, and planet-host projected separation are M_host_=0.76{+/-}0.40M{sun}, M_planet_=10.3{+/-}5.5M{Earth}, D_L_=3.3{+/-}1.3kpc, and a{perp}=3.3{+/-}1.4 au, respectively. The consistency of the color and brightness expected from the estimated lens mass and distance with those of the blend suggests the possibility that the most blended light comes from the planet host, and this hypothesis can be established if high-resolution images are taken during the next (2020) bulge season. We discuss the importance of conducting optimized photometry and aggressive follow-up observations for moderately or very high magnification events to maximize the detection rate of planets with very low mass ratios.2020AJ....160..255Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/255CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AcA/50/421 : OGLE-II DIA BUL_SC1 field (Wozniak, 2000)J/A+A/549/A147 : Abundances of microlensed bulge dwarf stars. V. (Bensby+,2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/A+A/617/A135 : 20 years of photometric microlensing (Mustill+, 2018)J/AJ/155/186 : The KMTNet/K2-C9 (Kepler) Data Release (Kim+, 2018)J/AJ/159/98 : I-band LC of microlensing event KMT-2016-BLG-1836 (Yang+,2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/255https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/160/255http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/160/255https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/160/255https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/160/255http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/160/255GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticalInfrareddefaultJ/AJ/160/255/fig1Light curve of KMT-2019-BLG-0842Imag[15.9/20.4] Apparent I band magnitudemagphot.mag;em.opt.IdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument usedinstr.setupcharHJD[7424/8726] Heliocentric Julian Date; JD-2450000dtime.epochdoubleindexede_Imag[0.007/0.29] Uncertainty in Imagmagstat.error;phot.magdouble