We report the discovery of a high mass-ratio planet q=0.012, i.e., 13 times higher than the Jupiter/Sun ratio. The host mass is not presently measured but can be determined or strongly constrained from adaptive optics imaging. The planet was discovered in a small archival study of high-magnification events in pure-survey microlensing data, which was unbiased by the presence of anomalies. The fact that it was previously unnoticed may indicate that more such planets lie in archival data and could be discovered by similar systematic study. In order to understand the transition from predominantly survey+followup to predominately survey-only planet detections, we conduct the first analysis of these detections in the observational (s,q) plane. Here s is projected separation in units of the Einstein radius. We find some evidence that survey+followup is relatively more sensitive to planets near the Einstein ring, but that there is no statistical difference in sensitivity by mass ratio.
@article{arxiv.1607.04919,
title = {OGLE-2016-BLG-0596Lb: High-Mass Planet From High-Magnification Pure-Survey Microlensing Event},
author = {P. Mróz and C. Han and A. Udalski and R. Poleski and J. Skowron and M. K. Szymański and I. Soszyński and P. Pietrukowicz and S. Kozłowski and K. Ulaczyk and Ł. Wyrzykowski and M. Pawlak and M. D. Albrow and S. -M. Cha and S. -J. Chung and Y. K. Jung and D. -J. Kim and S. -L. Kim and C. -U. Lee and Y. Lee and B. -G. Park and R. W. Pogge and Y. -H. Ryu and I. -G. Shin and J. C. Yee and W. Zhu and A. Gould},
journal= {arXiv preprint arXiv:1607.04919},
year = {2017}
}