MOA-2020-BLG-135Lb: A New Neptune-class Planet for the Extended MOA-II Exoplanet Microlens Statistical Analysis

We report the light-curve analysis for event MOA-2020-BLG-135, which leads to discovery of a new Neptune-class planet, MOA-2020-BLG-135Lb. With derived mass ratio $q=1.52_{-0.31}^{+0.39} \times 10^{-4}$ and separation $s\approx1$, planet lies exactly at break likely peak exoplanet mass-ratio function by MOA collaboration (Suzuki et al. 2016). estimate properties lens system based on Galactic model considering two different Bayesian priors: one assuming that all stars have an equal planet-hosting probability other planets are more orbit massive stars. uniform host prior, we predict is be $m_\mathrm{planet}=11.3_{-6.9}^{+19.2} M_\oplus$ star $M_\mathrm{host}=0.23_{-0.14}^{+0.39} M_\odot$, located distance $D_L=7.9_{-1.0}^{+1.0}\;\mathrm{kpc}$. prior holds occurrence scales in proportion mass, estimated $m_\mathrm{planet}=25_{-15}^{+22} M_\oplus$, $M_\mathrm{host}=0.53_{-0.32}^{+0.42} $D_L=8.3_{-1.0}^{+0.9}\; \mathrm{kpc}$. This qualifies inclusion extended MOA-II microlens sample.