# KMT-2018-BLG-1990Lb: A Nearby Jovian Planet From A Low-Cadence Microlensing Field

## TL;DR

This paper reports the discovery of a Jovian planet orbiting a late M dwarf using low-cadence microlensing data, demonstrating the effectiveness of survey-only data for characterizing such exoplanets.

## Contribution

First detection of a Jovian planet in a low-cadence microlensing field, showing survey data alone can effectively characterize distant exoplanets.

## Key findings

- Discovered a Jovian planet with 0.57 Jupiter masses.
- Located at 1.23 kpc from Earth.
- Orbiting a late M dwarf at 2.6 times the snow line.

## Abstract

We report the discovery and characterization of KMT-2018-BLG-1990Lb, a Jovian planet $(m_p=0.57_{-0.25}^{+0.79}\,M_J)$ orbiting a late M dwarf $(M=0.14_{-0.06}^{+0.20}\,M_\odot)$, at a distance $(D_L=1.23_{-0.43}^{+1.06}\,\kpc)$, and projected at $2.6\pm 0.6$ times the snow line distance, i.e., $a_{\rm snow}\equiv 2.7\,\au (M/M_\odot)$, This is the second Jovian planet discovered by KMTNet in its low cadence ($0.4\,{\rm hr}^{-1}$) fields, demonstrating that this population will be well characterized based on survey-only microlensing data.