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OGLE-2017-BLG-0373Lb: A Jovian Mass-Ratio Planet Exposes A New Accidental Microlensing Degeneracy

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dc.abstract.enWe report the discovery of microlensing planet OGLE-2017-BLG-0373Lb. We show that while the planet-host system has an unambiguous microlens topology, there are two geometries within this topology that fit the data equally well, which leads to a factor 2.5 difference in planet-host mass ratio, i.e., q=1.5×10<SUP>-3</SUP> vs. q=0.6×10<SUP>-3</SUP>. We show that this is an accidental degeneracy in the sense that it is due to a gap in the data. We dub it the caustic-chirality degeneracy. We trace the mathematical origins of this degeneracy, which should enable similar degenerate solutions to be easily located in the future. A Bayesian estimate, based on a Galactic model, yields a host mass M=0.25<SUP>+0.30</SUP><SUB>-0.15</SUB> M<SUB>⊙</SUB> at a distance D<SUB>L</SUB>=5.9<SUP>+1.3</SUP><SUB>-1.95</SUB> kpc. The lens-source relative proper motion is relatively fast, μ=9 mas/yr, which implies that the host mass and distance can be determined by high-resolution imaging after about 10 years. The same observations could in principle resolve the discrete degeneracy in q, but this will be more challenging.
dc.affiliationUniwersytet Warszawski
dc.contributor.authorSkowron, Jan
dc.contributor.authorRyu, Y. -H.
dc.contributor.authorHwang, K. -H.
dc.contributor.authorUdalski, Andrzej
dc.contributor.authorMróz, Przemysław
dc.contributor.authorKozłowski, Szymon
dc.contributor.authorSoszyński, Igor
dc.contributor.authorPietrukowicz, Paweł
dc.contributor.authorSzymański, Michał
dc.contributor.authorPoleski, Radosław
dc.contributor.authorUlaczyk, Krzysztof
dc.contributor.authorPawlak, Michał
dc.contributor.authorRybicki, Krzysztof
dc.contributor.authorIwanek, Patryk
dc.contributor.authorAlbrow, M. D.
dc.contributor.authorChung, S. -J.
dc.contributor.authorGould, A.
dc.contributor.authorHan, C.
dc.contributor.authorJung, Y. K.
dc.contributor.authorShin, I. -G.
dc.contributor.authorShvartzvald, Y.
dc.contributor.authorYee, J. C.
dc.contributor.authorZang, W.
dc.contributor.authorZhu, W.
dc.contributor.authorCha, S. -M.
dc.contributor.authorKim, D. -J.
dc.contributor.authorKim, H. -W.
dc.contributor.authorKim, S. -L.
dc.contributor.authorLee, C. -U.
dc.contributor.authorLee, D. -J.
dc.contributor.authorLee, Y.
dc.contributor.authorPark, B. -G.
dc.contributor.authorPogge, R. W.
dc.date.accessioned2024-01-25T15:41:07Z
dc.date.available2024-01-25T15:41:07Z
dc.date.copyright2018-02-27
dc.date.issued2018
dc.description.accesstimeBEFORE_PUBLICATION
dc.description.financeNie dotyczy
dc.description.number1
dc.description.versionORIGINAL_AUTHOR
dc.description.volume68
dc.identifier.doi10.32023/0001-5237/68.1.2
dc.identifier.issn0001-5237
dc.identifier.urihttps://repozytorium.uw.edu.pl//handle/item/114511
dc.identifier.weblinkhttp://adsabs.harvard.edu/abs/2018AcA....68...43S
dc.languageeng
dc.pbn.affiliationastronomy
dc.relation.ispartofActa Astronomica
dc.relation.pages43-61
dc.rightsOther
dc.sciencecloudnosend
dc.titleOGLE-2017-BLG-0373Lb: A Jovian Mass-Ratio Planet Exposes A New Accidental Microlensing Degeneracy
dc.typeJournalArticle
dspace.entity.typePublication