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arXiv · 2503.22331

AT2021uey: A planetary microlensing event outside the Galactic bulge

M. Ban·P. Voloshyn·R. Adomaviciene·E. Bachelet·V. Bozza·S. M. Brincat·I. Bruni·U. Burgaz·J. M. Carrasco·A. Cassan·V. Cepas·F. Cusano·M. Dennefeld·M. Dominik·F. Dubois·R. Figuera Jaimes·A. Fukui·C. Galdies·A. Garofalo·M. Hundertmark·I. Ilyin·K. Kruszynska·V. Kulijanishvili·T. Kvernadze·L. Logie·M. Maskoliunas·P. J. Mikolajczyk·P. Mroz·N. Narita·E. Pakstiene·J. Peloton·R. Poleski·J. K. T. Qvam·S. Rau·P. Rota·K. A. Rybicki·R. A. Street·Y. Tsapras·S. Vanaverbeke·J. Wambsganss·L. Wyrzykowski·J. Zdanavicius·M. Zejmo·P. Zielinski·S. Zola
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Abstract

We report the analysis of a planetary microlensing event AT2021uey. The event was observed outside the Galactic bulge and was alerted by both space- (Gaia) and ground-based (ZTF and ASAS-SN) surveys. From the observed data, we find that the lens system is located at a distance of 1 kpc and comprises an M-dwarf host star of about half a solar mass, orbited by a Jupiter-like planet beyond the snowline. The source star could be a metal-poor giant located in the halo according to the spectral analyses and modelling. Hence, AT2021uey is a unique example of the binary-lens event outside the bulge that is offered by a disc-halo lens-source combination.

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M. Ban, P. Voloshyn, R. Adomaviciene, E. Bachelet, V. Bozza, S. M. Brincat, I. Bruni, U. Burgaz, J. M. Carrasco, A. Cassan, V. Cepas, F. Cusano, M. Dennefeld, M. Dominik, F. Dubois, R. Figuera Jaimes, A. Fukui, C. Galdies, A. Garofalo, M. Hundertmark, I. Ilyin, K. Kruszynska, V. Kulijanishvili, T. Kvernadze, L. Logie, M. Maskoliunas, P. J. Mikolajczyk, P. Mroz, N. Narita, E. Pakstiene, J. Peloton, R. Poleski, J. K. T. Qvam, S. Rau, P. Rota, K. A. Rybicki, R. A. Street, Y. Tsapras, S. Vanaverbeke, J. Wambsganss, L. Wyrzykowski, J. Zdanavicius, M. Zejmo, P. Zielinski, S. Zola. 2025-03-28. AT2021uey: A planetary microlensing event outside the Galactic bulge. https://doi.org/10.1051/0004-6361/202554236

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