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AT2021uey: a planetary microlensing event outside the Galactic bulge

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-...

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Main Authors: Ban, Makiko (Author) , Voloshyn, P. (Author) , Adomavic̆ienė, R. (Author) , Bachelet, E. (Author) , Bozza, V. (Author) , Brincat, S. M. (Author) , Bruni, I. (Author) , Burgaz, U. (Author) , Carrasco, J. M. (Author) , Cassan, A. (Author) , C̆epas, V. (Author) , Cusano, F. (Author) , Dennefeld, M. (Author) , Dominik, M. (Author) , Dubois, F. (Author) , Figuera Jaimes, R. (Author) , Fukui, A. (Author) , Galdies, C. (Author) , Garofalo, A. (Author) , Hundertmark, Markus (Author) , Ilyin, I. (Author) , Kruszyńska, K. (Author) , Kulijanishvili, V. (Author) , Kvernadze, T. (Author) , Logie, L. (Author) , Maskoliūnas, M. (Author) , Mikołajczyk, P. J. (Author) , Mróz, P. (Author) , Narita, N. (Author) , Paks̆tienė, E. (Author) , Peloton, J. (Author) , Poleski, R. (Author) , Qvam, J. K. T. (Author) , Rau, S. (Author) , Rota, P. (Author) , Rybicki, K. A. (Author) , Street, R. A. (Author) , Tsapras, Yiannis (Author) , Vanaverbeke, S. (Author) , Wambsganß, Joachim (Author) , Wyrzykowski, Ł. (Author) , Zdanavic̆ius, J. (Author) , Żejmo, M. (Author) , Zieliński, P. (Author) , Zola, S. (Author)
Format: Article (Journal)
Language:English
Published: 7 May 2025
In: Astronomy and astrophysics
Year: 2025, Volume: 697, Pages: 1-10
ISSN:1432-0746
DOI:10.1051/0004-6361/202554236
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202554236
Verlag, kostenfrei, Volltext: https://www.aanda.org/10.1051/0004-6361/202554236
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Author Notes:M. Ban, P. Voloshyn, R. Adomavic̆ienė, E. Bachelet, V. Bozza, S.M. Brincat, I. Bruni, U. Burgaz, J.M. Carrasco, A. Cassan, V. C̆epas, 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, M. Maskoliūnas, P.J. Mikołajczyk, P. Mróz, N. Narita, E. Paks̆tienė, 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, J. Zdanavic̆ius, M. Żejmo, P. Zieliński, and S. Zola
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Summary: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.
Item Description:Gesehen am 27.10.2025
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202554236

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