RI-band LC of microlensing event OGLE-2018-BLG-1269Lb

DOI

We report the discovery of a planet in the microlensing event OGLE-2018-BLG-1269 with a planet-host mass ratio q~6x10^-4^, i.e., 0.6 times smaller than the Jupiter/Sun mass ratio. Combined with the Gaia parallax and proper motion, a strong one-dimensional constraint on the microlens parallax vector allows us to significantly reduce the uncertainties of lens physical parameters. A Bayesian analysis that ignores any information about light from the host yields that the planet is a cold giant (M_2_=0.69_-0.22_^+0.44^M_J_) orbiting a Sun-like star (M_1_=1.13_-0.35_^+0.72^M_{sun}) at a distance of D_L=2.56_-0.62_^+0.92^kpc. The projected planet-host separation is a_{perp}=4.61-1.17_^+1.70^au. Using Gaia astrometry, we show that the blended light lies 99.6%. The host is therefore a subgiant. For host metallicities in the range of 0.0<=[Fe/H]<=+0.3, the host and planet masses are then in the range of 1.16<=M_1_/M_{sun}<=1.38 and 0.74<=M_2/M_J_<=0.89, respectively. Low host metallicities are excluded. The brightness and proximity of the lens make the event a strong candidate for spectroscopic follow-up both to test the microlensing solution and to further characterize the system.

Identifier
DOI http://doi.org/10.26093/cds/vizier.51600148
Source https://dc.g-vo.org/rr/q/lp/custom/CDS.VizieR/J/AJ/160/148
Related Identifier https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/160/148
Related Identifier http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/160/148
Metadata Access http://dc.g-vo.org/rr/q/pmh/pubreg.xml?verb=GetRecord&metadataPrefix=oai_b2find&identifier=ivo://CDS.VizieR/J/AJ/160/148
Provenance
Creator Jung Y.K.; Gould A.; Udalski A.; Sumi T.; Yee J.C.; Han C.; Albrow M.D.,Chung S.-J.; Hwang K.-H.; Ryu Y.-H.; Shin I.-G.; Shvartzvald Y.; Zhu W.,Zang W.; 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.,Bond I.A.; Bhattacharya A.; Donachie M.; Fukui A.; Hirao Y.; Itow Y.,Kondo I.; Koshimoto N.; Li M.C.A.; Matsubara Y.; Miyazaki S.; Muraki Y.,Nagakane M.; Ranc C.; Rattenbury N.J.; Suematsu H.; Sullivan D.J.,Suzuki D.; Tristram P.J.; Yonehara A.
Publisher CDS
Publication Year 2020
Rights https://cds.unistra.fr/vizier-org/licences_vizier.html
OpenAccess true
Contact CDS support team <cds-question(at)unistra.fr>
Representation
Resource Type Dataset; AstroObjects
Discipline Astrophysical Processes; Astrophysics and Astronomy; Exoplanet Astronomy; Natural Sciences; Observational Astronomy; Physics