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.
@article{arxiv.1901.05466,
title = {A Wide Orbit Exoplanet OGLE-2012-BLG-0838Lb},
author = {Poleski R. and Suzuki D. and Udalski A. and Xie X. and Yee J. C. and Koshimoto N. and Gaudi B. S. and Gould A. and Skowron J. and Szymanski M. K. and Soszynski I. and Pietrukowicz P. and Kozlowski S. and Wyrzykowski L. and Ulaczyk K. and Abe F. and Barry R. K. and Bennett D. P. and Bhattacharya A. and Bond I. A. and Donachie M. and Fujii H. and Fukui A. and Itow Y. and Hirao Y. and Kamei Y. and Kondo I. and Li M. C. A. and Matsubara Y. and Miyazaki S. and Muraki Y. and Nagakane M. and Ranc C. and Rattenbury N. J. and Satoh Y. K. and Shoji H. and Suematsu H. and Sullivan D. J. and Sumi T. and Tristram P. J. and Yamakawa T. and Yamawaki T. and Yonehara A. and Han C. and Dong S. and Morzinski K. M. and Males J. R. and Close L. M. and Pogge R. W. and Beaulieu J. -P. and Marquette J. -B},
journal= {arXiv preprint arXiv:1901.05466},
year = {2021}
}