J/AJ/159/256ivo://CDS.VizieR/J/AJ/159/256doi:10.26093/cds/vizier.51590256CDSHerrera-Martin A.Albrow M.D.Udalski A.Gould A.Ryu Y.-H.Yee J.C.,Chung S.-J.Han C.Hwang K.-H.Jung Y.K.Lee C.-U.Shin I.-G.,Shvartzvald Y.Zang W.Cha S.-M.Kim D.-J.Kim H.-W.Kim S.-L.,Lee D.-J.Lee Y.Park B.-G.Pogge R.W.Szymanski M.K.Mroz P.,Skowron J.Poleski R.Soszynski I.Kozlowski S.Pietrukowicz P.,Ulaczyk K.Rybicki K.Iwanek P.Wrona M.2021-12-06T23:21:22Z2020-07-24T08:52:20ZCDS support team

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

cds-question@unistra.frgravitational-lensingexoplanetsphotometryvisible-astronomyWe report the analysis of the microlensing event OGLE-2018-BLG-0677. A small feature in the light curve of the event leads to the discovery that the lens is a star-planet system. Although there are two degenerate solutions that could not be distinguished for this event, both lead to a similar planet-host mass ratio. We perform a Bayesian analysis based on a Galactic model to obtain the properties of the system and find that the planet corresponds to a super- Earth/sub-Neptune with a mass of M_planet_=3.96_-2.66_^+5.88^M_{Earth}_. The host star has a mass of M_host_=0.12_-0.08_^+0.14^M_{odot}_. The projected separation for the inner and outer solutions are 0.63_-0.17_^+0.20^au and 0.72_-0.19_^+0.23^au respectively. At {Delta}{chi}^2^={chi}^2^(1L1S-{chi}^2^(2L1S)=46, this is by far the lowest {Delta}{chi}^2^ for any securely detected microlensing planet to date, a feature that is closely connected to the fact that it is detected primarily via a "dip" rather than a "bump."2020AJ....159..256Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/256CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/AcA/50/1 : OGLE microlensing events in Galactic Bulge (Udalski+, 2000)J/AcA/50/307 : OGLE LMC BVI photometry (Udalski+, 2000)J/AcA/52/217 : OGLE II. VI photometry of Galactic Bulge (Udalski+, 2002)J/ApJ/631/906 : MACHO Galactic Bulge microlensing events (Thomas+, 2005)J/ApJ/636/240 : OGLE II microlensing parameters (Sumi+, 2006)J/ApJ/668/643 : Multiply imaged gravitational lens systems (Limousin+, 2007)J/ApJ/711/L48 : 2008 OGLE Bulge microlensing alerts (Cohen+, 2010)J/A+A/533/A134 : Abundances of microlensed stars in the Bulge (Bensby+, 2011)J/ApJ/755/31 : Compilation of 122 strong gravitational lenses (Cao+, 2012)J/ApJS/216/12 : OGLE-III Galactic bulge microlensing (Wyrzykowski+, 2015)J/A+A/617/A135 : 20 years of photometric microlensing (Mustill+, 2018)J/ApJS/244/29 : Microlensing events toward the Galactic bulge (Mroz+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/256https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/256http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/256https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/256https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/256http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/256GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/AJ/159/256/fig1Light curve for OGLE-2018-BLG-0677recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintInstInstrument identifier (1)meta.id;instrcharHJD[8200/8260] Heliocentric Julian Date; HJD-2450000dtime.epochdoubleFlux[97.3/1836] Relative fluxphot.flux;arith.ratiodoublee_Flux[8.1/75] Uncertainty in Fluxstat.error;phot.fluxdouble