# OGLE-2013-BLG-0132Lb and OGLE-2013-BLG-1721Lb: Two Saturn-mass Planets Discovered around M-dwarfs

## TL;DR

This paper reports the discovery of two Saturn-mass planets orbiting M-dwarfs through faint microlensing events, using high-cadence photometric surveys and Bayesian analysis to estimate their masses, contributing to the understanding of sub-Jupiter planets beyond the snow line.

## Contribution

First detection of Saturn-mass planets around M-dwarfs via microlensing with detailed Bayesian mass estimates.

## Key findings

- Both planets are sub-Jupiter-mass with estimated masses around 0.3 and 0.6 Jupiter masses.
- High proper motion of one host star makes it suitable for follow-up imaging.
- Planets are located beyond the snow line, adding to the sample of such exoplanets.

## Abstract

We present the discovery of two planetary systems consisting of a Saturn-mass planet orbiting an M-dwarf, which were detected in faint microlensing events OGLE-2013-BLG-0132 and OGLE-2013-BLG-1721. The planetary anomalies were covered with high cadence by OGLE and MOA photometric surveys. The light curve modeling indicates that the planet-to-host mass ratios are $(5.15 \pm 0.28)\times 10^{-4}$ and $(13.18 \pm 0.72)\times 10^{-4}$, respectively. Both events were too short and too faint to measure a reliable parallax signal and hence the lens mass. We therefore used a Bayesian analysis to estimate the masses of both planets: $0.29^{+0.16}_{-0.13}\ M_{Jup}$ (OGLE-2013-BLG-0132Lb) and $0.64^{+0.35}_{-0.31}\ M_{Jup}$ (OGLE-2013-BLG-1721Lb). Thanks to a high relative proper motion, OGLE-2013-BLG-0132 is a promising candidate for the high-resolution imaging follow-up. Both planets belong to an increasing sample of sub-Jupiter-mass planets orbiting M-dwarfs beyond the snow line.