A Newly Identified Degeneracy Keeps the Planetary Interpretation Viable for OGLE-2011-BLG-0950
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2026
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| author | Zhang, Jiyuan Zang, Weicheng Udalski, Andrzej Yang, Hongjing Mao, Shude Szymański, Michał K. Soszyński, Igor Poleski, Radoslaw Ulaczyk, Krzysztof Pietrukowicz, Paweł Kozłowski, Szymon Skowron, Jan Mróz, Przemek Terry, Sean K. Gould, Andrew |
| author_facet | Zhang, Jiyuan Zang, Weicheng Udalski, Andrzej Yang, Hongjing Mao, Shude Szymański, Michał K. Soszyński, Igor Poleski, Radoslaw Ulaczyk, Krzysztof Pietrukowicz, Paweł Kozłowski, Szymon Skowron, Jan Mróz, Przemek Terry, Sean K. Gould, Andrew |
| contents | The microlensing event OGLE-2011-BLG-0950 exhibits the well-known ``Planet/Binary'' degeneracy, in which distinct lens configurations produce similar light curves but imply substantially different mass ratios between the lens components. A previous study suggested that high-resolution imaging could break this degeneracy through differences in the lens-source relative proper motion. In this work, we identify a new planetary model for this event that arises from a newly identified degeneracy, simultaneously reproducing the observed light curve and remaining consistent with the relative proper motion measured from high-resolution imaging. By combining constraints from the light-curve modeling and high-resolution observations, we infer a lens system consisting of a $\sim 1~M_{\odot}$ host star orbited by a $\sim 1.5~M_{\rm Jup}$ planet, with a projected separation of about 2 or 8 au, subject to the ``Close/Wide'' degeneracy. Our reanalysis of the color-magnitude diagram further indicates that the source star has unresolved companions that contribute non-negligible blended light, highlighting the importance of carefully accounting for source and lens companions in future Roman microlensing analyses. Finally, we show that adopting a single mass--luminosity relation significantly underestimates the uncertainties in the inferred lens properties for host masses $\gtrsim 1~M_{\odot}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_13276 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Newly Identified Degeneracy Keeps the Planetary Interpretation Viable for OGLE-2011-BLG-0950 Zhang, Jiyuan Zang, Weicheng Udalski, Andrzej Yang, Hongjing Mao, Shude Szymański, Michał K. Soszyński, Igor Poleski, Radoslaw Ulaczyk, Krzysztof Pietrukowicz, Paweł Kozłowski, Szymon Skowron, Jan Mróz, Przemek Terry, Sean K. Gould, Andrew Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics The microlensing event OGLE-2011-BLG-0950 exhibits the well-known ``Planet/Binary'' degeneracy, in which distinct lens configurations produce similar light curves but imply substantially different mass ratios between the lens components. A previous study suggested that high-resolution imaging could break this degeneracy through differences in the lens-source relative proper motion. In this work, we identify a new planetary model for this event that arises from a newly identified degeneracy, simultaneously reproducing the observed light curve and remaining consistent with the relative proper motion measured from high-resolution imaging. By combining constraints from the light-curve modeling and high-resolution observations, we infer a lens system consisting of a $\sim 1~M_{\odot}$ host star orbited by a $\sim 1.5~M_{\rm Jup}$ planet, with a projected separation of about 2 or 8 au, subject to the ``Close/Wide'' degeneracy. Our reanalysis of the color-magnitude diagram further indicates that the source star has unresolved companions that contribute non-negligible blended light, highlighting the importance of carefully accounting for source and lens companions in future Roman microlensing analyses. Finally, we show that adopting a single mass--luminosity relation significantly underestimates the uncertainties in the inferred lens properties for host masses $\gtrsim 1~M_{\odot}$. |
| title | A Newly Identified Degeneracy Keeps the Planetary Interpretation Viable for OGLE-2011-BLG-0950 |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2601.13276 |