Bibcode
Ban, M.; Voloshyn, P.; Adomavic̆ienė, R.; Bachelet, E.; Bozza, V.; Brincat, S. M.; Bruni, I.; Burgaz, U.; Carrasco, J. M.; Cassan, A.; C̆epas, V.; Cusano, F.; Dennefeld, M.; Dominik, M.; Dubois, F.; Figuera Jaimes, R.; Fukui, A.; Galdies, C.; Garofalo, A.; Hundertmark, M.; Ilyin, I.; Kruszyńska, K.; Kulijanishvili, V.; Kvernadze, T.; Logie, L.; Maskoliūnas, M.; Mikołajczyk, P. J.; Mróz, P.; Narita, N.; Paks̆tienė, E.; Peloton, J.; Poleski, R.; Qvam, J. K. T.; Rau, S.; Rota, P.; Rybicki, K. A.; Street, R. A.; Tsapras, Y.; Vanaverbeke, S.; Wambsganss, J.; Wyrzykowski, Ł.; Zdanavic̆ius, J.; Żejmo, M.; Zieliński, P.; Zola, S.
Bibliographical reference
Astronomy and Astrophysics
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5
2025
Journal
Citations
2
Refereed citations
0
Description
We report the analysis of a planetary microlensing event AT2021uey. The event was observed outside the Galactic bulge and alerted 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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Pallé Bago