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KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
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KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
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Paper
KMT-2021-BLG-1898: Planetary microlensing event involved with binary source stars
2022
Overview
The light curve of the microlensing event KMT-2021-BLG-1898 exhibits a short-term central anomaly with double-bump features that cannot be explained by the usual binary-lens or binary-source interpretations. With the aim of interpreting the anomaly, we analyze the lensing light curve under various sophisticated models. We find that the anomaly is explained by a model, in which both the lens and source are binaries (2L2S model). For this interpretation, the lens is a planetary system with a planet/host mass ratio of \\(q\\sim 1.5\\times 10^{-3}\\), and the source is a binary composed of a turn off or a subgiant star and a mid K dwarf. The double-bump feature of the anomaly can also be depicted by a triple-lens model (3L1S model), in which the lens is a planetary system containing two planets. Among the two interpretations, the 2L2S model is favored over the 3L1S model not only because it yields a better fit to the data, by \\(\\Delta\\chi^2=[14.3\\)--18.5], but also the Einstein radii derived independently from the two stars of the binary source result in consistent values. According to the 2L2S interpretation, KMT-2021-BLG-1898 is the third planetary lensing event occurring on a binary stellar system, following MOA-2010-BLG-117 and KMT-2018-BLG-1743. Under the 2L2S interpretation, we identify two solutions resulting from the close-wide degeneracy in determining the planet-host separation. From a Bayesian analysis, we estimate that the planet has a mass of \\(\\sim 0.7\\)--0.8~\\(M_{\\rm J}\\), and it orbits an early M dwarf host with a mass of \\(\\sim 0.5~M_\\odot\\). The projected planet-host separation is \\(\\sim 1.9\\)~AU and \\(\\sim 3.0\\)~AU according to the close and wide solutions, respectively.
Publisher
Cornell University Library, arXiv.org
Subject
