J/AJ/161/126ivo://CDS.VizieR/J/AJ/161/126doi:10.26093/cds/vizier.51610126CDSRyu Y.-H.Mroz P.Gould A.Hwang K.-H.Kim H.-W.Yee J.C.Albrow M.D.,Chung S.-J.Jung Y.K.Shin I.-G.Shvartzvald Y.Zang W.Cha S.-M.,Kim D.-J.Kim S.-L.Lee C.-U.Lee D.-J.Lee Y.Park B.-G.Han C.,Pogge R.W.Udalski A.Poleski R.Skowron J.Szymanski M.K.,Soszynski I.Pietrukowicz P.Kozlowski S.Ulaczyk K.Rybicki K.A.,Iwanek P.2021-12-08T19:03:03Z2021-05-10T07:32:36ZCDS support team

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

cds-question@unistra.frgravitational-lensinginfrared-photometryvisible-astronomyphotometryWe report a new free-floating planet (FFP) candidate, KMT-2017-BLG-2820, with Einstein radius {theta}E~6{mu}as, lens-source relative proper motion {mu}rel~8mas/yr, and Einstein timescale t_E_=6.5hr. It is the third FFP candidate found in an ongoing study of giant-source finite-source point-lens (FSPL) events in the KMTNet database and the sixth FSPL FFP candidate overall. We find no significant evidence for a host. Based on their timescale distributions and detection rates, we argue that five of these six FSPL FFP candidates are drawn from the same population as the six point-source point-lens (PSPL) FFP candidates found by Mroz et al. in the OGLE-IV database. The {theta}E distribution of the FSPL FFPs implies that they are either sub- Jovian planets in the bulge or super-Earths in the disk. However, the apparent "Einstein desert" (10<~{theta}E/{mu}as<~30) would argue for the latter. Whether each of the 12 (six FSPL and six PSPL) FFP candidates is truly an FFP or simply a very wide-separation planet can be determined at first adaptive optics (AO) light on 30m telescopes, and earlier for some. If the latter, a second epoch of AO observations could measure the projected planet- host separation with a precision of O(10au). At the present time, the balance of evidence favors the unbound-planet hypothesis.2021AJ....161..126Rhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/161/126CatalogResearchIsServedByTAP 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/A+A/618/A44 : Predicted microlensing events from Gaia DR2 (Bramich, 2018)J/AcA/68/183 : Predicted Microlensing Events for 21st Century (Bramich+, 2018)J/AJ/159/98 : I-band LC of microlensing event KMT-2016-BLG-1836 (Yang+, 2020)J/AJ/159/262 : OGLE/KMTnet VI bands photo. of OGLE-2019-BLG-0551 (Mroz+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/161/126https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/161/126http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/161/126https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/161/126https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/161/126http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/161/126GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.367228618189496e-19 2.6706780932288093e-19OpticalInfrareddefaultJ/AJ/161/126/fig1Light curve of KMT-2017-BLG-2820recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTelObservatory identifier (KMTA, KMTC, KMTS and OGLE)meta.id;instr.obstycharHJD[7792/8045] Heliocentric Julian Date; HJD-24500000dtime.epochdoubleImag[16.33/17.29] Apparent I band magnitudemagphot.mag;em.opt.Idoublee_Imag[0.005/0.08] Uncertainty in Imagmagstat.error;phot.magdouble