MOA-2022-BLG-563Lb, KMT-2023-BLG-0469Lb, and KMT-2023-BLG-0735Lb: Three sub-Jovian-mass microlensing planets
arxiv(2024)
摘要
We analyze the anomalies appearing in the light curves of the three
microlensing events MOA-2022-BLG-563, KMT-2023-BLG-0469, and KMT-2023-BLG-0735.
The anomalies exhibit common short-term dip features that appear near the peak.
From the detailed analyses of the light curves, we find that the anomalies were
produced by planets accompanied by the lenses of the events. For all three
events, the estimated mass ratios between the planet and host are on the order
of 10^-4: q∼ 8 × 10^-4 for MOA-2022-BLG-563L, q∼ 2.5×
10^-4 for KMT-2023-BLG-0469L, and q∼ 1.9× 10^-4 for
KMT-2023-BLG-0735L. The interpretations of the anomalies are subject to a
common inner-outer degeneracy, which causes ambiguity when estimating the
projected planet-host separation. We estimated the planet mass, M_ p,
host mass, M_ h, and distance, D_ L, to the planetary system by
conducting Bayesian analyses using the observables of the events. The estimated
physical parameters of the planetary systems are (M_ h/M_⊙, M_
p/M_ J, D_ L/ kpc) = (0.48^+0.36_-0.30,
0.40^+0.31_-0.25, 6.53^+1.12_-1.57) for MOA-2022-BLG-563L,
(0.47^+0.35_-0.26, 0.124^+0.092_-0.067, 7.07^+1.03_-1.19) for
KMT-2023-BLG-0469L, and (0.62^+0.34_-0.35, 0.125^+0.068_-0.070,
6.26^+1.27_-1.67) for KMT-2023-BLG-0735L. According to the estimated
parameters, all planets are cold planets with projected separations that are
greater than the snow lines of the planetary systems, they have masses that lie
between the masses of Uranus and Jupiter of the Solar System, and the hosts of
the planets are main-sequence stars that are less massive than the Sun.
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