Abstract
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 Optical Gravitational Lensing Experiment (OGLE) and Microlensing Observations in Astrophysics (MOA) photometric surveys. The light curve modeling indicates that the planet-to-host mass ratios are and , 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: (OGLE-2013-BLG-0132Lb) and (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.
Highlights
Gravitational microlensing provides a unique tool for studying planet formation around late-type stars
The microlensing signal does not depend on the host brightness and the sensitivity of the method happens to peak near or beyond the snow line of the majority of planetary systems
This is a location in the proto-planetary disk where the water ice may condense and where gas giant planets are believed to be formed (Mizuno 1980; Pollack et al 1996)
Summary
We present the analysis of two faint microlensing events OGLE-2013-BLG-0132 and OGLE-2013-BLG-1721, which were caused by M-dwarfs hosting a Saturn-mass planet. The OGLE and MOA data sets were rereduced Both events occurred on faint stars and during the peak magnification, they did not exceed I » 17. We carefully detrended the data, but we decided to use 20-day subsets of light curves, which cover peaks and planetary anomalies of both events. This choice has a small effect on the best-fitting model parameters. The MOA data set, c2 dof ~ 1 and we did not apply error corrections
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