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

Skowron, J.; Ryu, Y. -H.; Hwang, K. -H.; Udalski, A.; Mróz, P.; Kozłowski, S.; Soszyński, I.; Pietrukowicz, P.; Szymański, M. K.; Poleski, R.; Ulaczyk, K.; Pawlak, M.; Rybicki, K.; Iwanek, P.; Albrow, M. D.; Chung, S. -J.; Gould, A.; Han, C.; Jung, Y. K.; Shin, I. -G.; Shvartzvald, Y.; Yee, J. C.; Zang, W.; Zhu, 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.

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

MPS-Authors

Skowron, J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ryu, Y. -H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hwang, K. -H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Udalski, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Mróz, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kozłowski, S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Soszyński, I.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pietrukowicz, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Szymański, M. K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Poleski, R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ulaczyk, K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pawlak, M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rybicki, K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Iwanek, P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Albrow, M. D.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chung, S. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Gould, A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Han, C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Jung, Y. K.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shin, I. -G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Shvartzvald, Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yee, J. C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zang, W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zhu, W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Cha, S. -M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, D. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, H. -W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kim, S. -L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, C. -U.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, D. -J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lee, Y.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Park, B. -G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pogge, R. W.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2018AcA....68...43S
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Citation

Skowron, J., Ryu, Y.-.-H., Hwang, K.-.-H., Udalski, A., Mróz, P., Kozłowski, S., et al. (2018). OGLE-2017-BLG-0373Lb: A Jovian Mass-Ratio Planet Exposes A New Accidental Microlensing Degeneracy. Acta Astronomica, 68, 43-61.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CB08-E

Abstract

We 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^-3 vs. q=0.6×10^-3. 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^+0.30_-0.15 M_☉ at a distance D_L=5.9^+1.3_-1.95 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.