Historic microlensing events in the euclid Galactic Bulge Survey
Abstract
Microlensing campaigns have a long history of observations covering the Galactic bulge, where thousands of detections have been obtained, including many exoplanetary systems. The Euclid Galactic Bulge Survey represents a unique opportunity to revisit a large number of past events and attempt the lens-source resolution of known events falling in the covered area. As the analysis of individual events requires non-negligible efforts, it is important to establish priorities among all possible targets, identifying those candidates with the higher chance for a successful resolution of the lens from the source and with the highest scientific interest. Drawing from the databases of the three main microlensing surveys (OGLE, MOA and KMTNet), we compile the complete catalog of past microlensing events in the Euclid survey footprint up to year 2023, containing 8081 entries. By re-modeling all events and cross-checking with Galactic models, we estimate the relative lens-source proper motions for all events. Taking into account all uncertainties, for each microlensing event we are able to estimate the probability that the lens is separated from the source by more than a given angular distance threshold. Hence, we rank all events by their resolution probability, providing additional useful information that will guide future analyses on the most promising candidates. A particular attention is dedicated to known planetary microlensing events.
Cite
@article{arxiv.2511.03307,
title = {Historic microlensing events in the euclid Galactic Bulge Survey},
author = {V. Bozza and L. Salmeri and P. Rota and E. Bachelet and J. -P. Beaulieu and A. A. Cole and J. C. Cuillandre and E. Kerins and I. Mcdonald and P. Mróz and M. Penny and C. Ranc and N. Rektsini and E. Thygesen and H. Verma 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 K. A. Rybicki and P. Iwanek and M. Wrona and M. Gromadzki and M. J. Mróz and F. Abe and D. P. Bennett and A. Bhattacharya and I. A. Bond and R. Hamada and Y. Hirao and A. Idei and S. Ishitani Silva and S. Miyazaki and Y. Muraki and T. Nagai and K. Nunota and G. Olmschenk and N. J. Rattenbury and Y. K. Satoh and T. Sumi and D. Suzuki and T. Tamaoki and S. K. Terry and P. J. Tristram and A. Vandorou and H. Yama},
journal= {arXiv preprint arXiv:2511.03307},
year = {2025}
}
Comments
12 pages, 12 figures