AT2021uey: a planetary microlensing event outside the Galactic bulge

M Ban; P Voloshyn; Rūta Adomavičienė; E Bachelet; V Bozza; S. M Brincat; I Bruni; U Burgaz; J. M Carrasco; A Cassan; Vytautas Čepas; F Cusano; M Dennefeld; M Dominik; F Dubois; R Figuera Jaimes; A Fukui; C Galdies; A Garofalo; M Hundertmark; I Ilyin; K Kruszyńska; V Kulijanishvili; T Kvernadze; L Logie; Marius Maskoliūnas; P. J Mikołajczyk; P Mróz; N Narita; Erika Pakštienė; J Peloton; R Poleski; J. K.T Qvam; S Rau; P Rota; K. A Rybicki; R. A Street; Y Tsapras; S Vanaverbeke; J Wambsganss; Ł Wyrzykowski; Justas Zdanavičius; M Zejmo; P Zieliński; S Zola

doi:10.1051/0004-6361/202554236

Title	AT2021uey: a planetary microlensing event outside the Galactic bulge
Authors	Ban, M ; Voloshyn, P ; Adomavičienė, Rūta ; Bachelet, E ; Bozza, V ; Brincat, S. M ; Bruni, I ; Burgaz, U ; Carrasco, J. M ; Cassan, A ; Čepas, Vytautas ; 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, Marius ; Mikołajczyk, P. J ; Mróz, P ; Narita, N ; Pakštienė, Erika ; 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 ; Zdanavičius, Justas ; Zejmo, M ; Zieliński, P ; Zola, S
DOI	10.1051/0004-6361/202554236
Full Text
Is Part of	Astronomy and astrophysics.. Les Ulis : EDP Sciences. 2025, vol. 697, art. no. A57, p. [1-10].. ISSN 0004-6361. eISSN 1432-0746
Keywords [eng]	gravitational lensing: micro ; methods: observational ; planets and satellites: detection ; techniques: photometric ; techniques: spectroscopic
Abstract [eng]	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.
Published	Les Ulis : EDP Sciences
Type	Journal article
Language	English
Publication date	2025
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„AT2021uey: a planetary microlensing event outside the Galactic bulge“