# A Wide Orbit Exoplanet OGLE-2012-BLG-0838Lb

## TL;DR

This paper reports the discovery of a wide-orbit exoplanet via microlensing, highlighting the method's effectiveness in detecting planets at large separations around low-mass stars.

## Contribution

It presents a detailed analysis of a wide-orbit exoplanet detection using microlensing, including model fitting and prospects for direct measurement of the system's properties.

## Key findings

- Planet has a projected separation of ~4 AU, twice the Einstein radius.
- Microlensing effectively detects wide-orbit planets around low-mass stars.
- Discussion on potential for direct mass and distance measurements.

## Abstract

We present the discovery of a planet on a very wide orbit in the microlensing event OGLE-2012-BLG-0838. The signal of the planet is well separated from the main peak of the event and the planet-star projected separation is found to be twice larger than the Einstein ring radius, which roughly corresponds to a projected separation of ~4 AU. Similar planets around low-mass stars are very hard to find using any technique other than microlensing. We discuss microlensing model fitting in detail and discuss the prospects for measuring the mass and distance of lens system directly.