Kavli Affiliate: Subo Dong
| First 5 Authors: Hongyu Li, Jiyuan Zhang, Cheongho Han, Weicheng Zang, Youn Kil Jung
| Summary:
We present the discovery and analysis of the sixth microlensing two-planet
system, KMT-2022-BLG-1818Lb,c, detected by a follow-up program targeting
high-magnification events. Both planets are subject to the well-known
”Close/Wide” degeneracy, although for the first planet, which has a
super-Jovian mass ratio of $q_2 simeq 5times 10^{-3}$ in both solutions, the
Close topology, with a normalized separation of $ssimeq 0.70$, is clearly
preferred by $Deltachi^2=26$. However, contrary to all previous two-planet
microlensing systems, the mass ratio for the second planet, $q_3$, is
substantially (factor of $sim 10$) different for the Close and Wide topologies
of the first planet. While this degeneracy is resolved in the present case due
to high-cadence follow-up observations, the appearance of this new degeneracy
indicates the need for caution in the analysis of future two-planet systems. A
Bayesian analysis suggests that the host is likely a K-dwarf star in the
Galactic disk. The first planet is probably a super-Jupiter on a Jupiter-like
orbit, while the second planet is a Saturn-class planet on either a
Mercury-like or Saturn-like orbit.
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