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

doi:10.1051/0004-6361/202554236

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. HundertmarkI. 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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Article number	A57
Number of pages	10
Journal	Astronomy & Astrophysics
Volume	697
DOIs	https://doi.org/10.1051/0004-6361/202554236
Publication status	Published - 7 May 2025

Keywords

Gravitational lensing: micro
Methods: observational
Techniques: photometric
Techniques: spectroscopic
Planets and satellites: detection

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10.1051/0004-6361/202554236Licence: CC BY

Ban_2025_AaA_AT2021uey-planetary-microlensing-outside-galactic-bulge_CC
© The Authors 2025. Open Access article, published under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Final published version, 3.98 MBLicence: CC BY

ORP: Opticon RadioNet Pilot: ORP: Opticon RadioNet Pilot
Dominik, M. (PI)
European Commission Joint Research Centre
1/03/21 → 28/02/25
Project: Standard

Cite this

Ban, M., Voloshyn, P., Adomaviciene, R., Bachelet, E., Bozza, V., Brincat, S. M., Bruni, I., Burgaz, U., Carrasco, J. M., Cassan, A., Cepas, V., Cusano, F., Dennefeld, M., Dominik, M., Dubois, F., Figuera Jaimes, R., Fukui, A., Galdies, C., Garofalo, A., ... Zola, S. (2025). AT2021uey: a planetary microlensing event outside the galactic bulge. Astronomy & Astrophysics, 697, Article A57. https://doi.org/10.1051/0004-6361/202554236

@article{0cd041c05ee44e8c9ef89cad5a4df8ac,

title = "AT2021uey: a planetary microlensing event outside the galactic bulge",

abstract = "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.",

keywords = "Gravitational lensing: micro, Methods: observational, Techniques: photometric, Techniques: spectroscopic, Planets and satellites: detection",

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

note = "Funding: Work by Makiko Ban and Rados{\l}aw Poleski was supported by Polish National Agency for Academic Exchange grant “Polish Returns 2019.” This work was developed within the Fink community and made use of the Fink community broker resources. Julien Peloton thanks LSST-France and CNRS/IN2P3 for supporting Fink. We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team19. Josep Manel Carrasco was (partially) supported by the Spanish MICIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe” by the “European Union” through grant PID2021-122842OB-C21, and the Institute of Cosmos Sciences University of Barcelona (ICCUB, Unidad de Excelencia {\textquoteleft}Mar{\'i}a de Maeztu{\textquoteright}) through grant CEX2019-000918-M. Erika Pak{\u s}tienė, Justas Zdanavi{\u c}ius, Marius Maskoliūnas, Vytautas {\u C}epas, Rūta Urbonavi{\u c}iūtė, Edita Stonkute acknowledge the support of the observations at Moletai AO from the Research Council of Lithuania (grant No. S-LL-24-1). Work by Akihiko Fukui and Norio Narita was partly supported by JSPS KAKENHI Grant Number JP17H02871, JP17H04574, JP18H05439, and JST CREST Grant Number JPMJCR1761. Yiannis Tsapras acknowledges the support of DFG priority program SPP 1992 “Exploring the Diversity of Extrasolar Planets” (TS 356/3-1). The project is supported by the European Union{\textquoteright}s Horizon 2020 research and innovation program under grant agreement 101004719. We acknowledge the support from the European Union{\textquoteright}s research and innovation programmes under grant agreements No. 101004719 (OPTICON-RadioNet Pilot, ORP) and No. 101131928 (ACME). We acknowledge the support from the Polish National Science Centre NCN grant DAINA No 2024/52/L/ST9/00210. This work was partially supported by a program of the Polish Ministry of Science under the title {\textquoteleft}Regional Excellence Initiative{\textquoteright}, project no. RID/SP/0050/2024/1. R.F.J. acknowledges support for this project provided by ANID{\textquoteright}s Millennium Science Initiative through grant ICN12_009, awarded to the Millennium Institute of Astrophysics (MAS), and by ANID{\textquoteright}s Basal project FB210003.",

year = "2025",

month = may,

day = "7",

doi = "10.1051/0004-6361/202554236",

language = "English",

volume = "697",

journal = "Astronomy & Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

}

Ban, M, Voloshyn, P, Adomaviciene, R, Bachelet, E, Bozza, V, Brincat, SM, Bruni, I, Burgaz, U, Carrasco, JM, Cassan, A, Cepas, V, Cusano, F, Dennefeld, M, Dominik, M, Dubois, F, Figuera Jaimes, R, Fukui, A, Galdies, C, Garofalo, A, Hundertmark, M, Ilyin, I, Kruszynska, K, Kulijanishvili, V, Kvernadze, T, Logie, L, Maskoliunas, M, Mikolajczyk, PJ, Mroz, P, Narita, N, Pakstiene, E, Peloton, J, Poleski, R, Qvam, JKT, Rau, S, Rota, P, Rybicki, KA, Street, RA, Tsapras, Y, Vanaverbeke, S, Wambsganss, J, Wyrzykowski, L, Zdanavicius, J, Zejmo, M, Zielinski, P & Zola, S 2025, 'AT2021uey: a planetary microlensing event outside the galactic bulge', Astronomy & Astrophysics, vol. 697, A57. https://doi.org/10.1051/0004-6361/202554236

TY - JOUR

T1 - AT2021uey

T2 - a planetary microlensing event outside the galactic bulge

AU - Ban, M.

AU - Voloshyn, P.

AU - Adomaviciene, R.

AU - Bachelet, E.

AU - Bozza, V.

AU - Brincat, S. M.

AU - Bruni, I.

AU - Burgaz, U.

AU - Carrasco, J. M.

AU - Cassan, A.

AU - Cepas, V.

AU - Cusano, F.

AU - Dennefeld, M.

AU - Dominik, M.

AU - Dubois, F.

AU - Figuera Jaimes, R.

AU - Fukui, A.

AU - Galdies, C.

AU - Garofalo, A.

AU - Hundertmark, M.

AU - Ilyin, I.

AU - Kruszynska, K.

AU - Kulijanishvili, V.

AU - Kvernadze, T.

AU - Logie, L.

AU - Maskoliunas, M.

AU - Mikolajczyk, P. J.

AU - Mroz, P.

AU - Narita, N.

AU - Pakstiene, E.

AU - Peloton, J.

AU - Poleski, R.

AU - Qvam, J. K. T.

AU - Rau, S.

AU - Rota, P.

AU - Rybicki, K. A.

AU - Street, R. A.

AU - Tsapras, Y.

AU - Vanaverbeke, S.

AU - Wambsganss, J.

AU - Wyrzykowski, L.

AU - Zdanavicius, J.

AU - Zejmo, M.

AU - Zielinski, P.

AU - Zola, S.

N1 - Funding: Work by Makiko Ban and Radosław Poleski was supported by Polish National Agency for Academic Exchange grant “Polish Returns 2019.” This work was developed within the Fink community and made use of the Fink community broker resources. Julien Peloton thanks LSST-France and CNRS/IN2P3 for supporting Fink. We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team19. Josep Manel Carrasco was (partially) supported by the Spanish MICIN/AEI/10.13039/501100011033 and by “ERDF A way of making Europe” by the “European Union” through grant PID2021-122842OB-C21, and the Institute of Cosmos Sciences University of Barcelona (ICCUB, Unidad de Excelencia ‘María de Maeztu’) through grant CEX2019-000918-M. Erika Paks̆tienė, Justas Zdanavic̆ius, Marius Maskoliūnas, Vytautas C̆epas, Rūta Urbonavic̆iūtė, Edita Stonkute acknowledge the support of the observations at Moletai AO from the Research Council of Lithuania (grant No. S-LL-24-1). Work by Akihiko Fukui and Norio Narita was partly supported by JSPS KAKENHI Grant Number JP17H02871, JP17H04574, JP18H05439, and JST CREST Grant Number JPMJCR1761. Yiannis Tsapras acknowledges the support of DFG priority program SPP 1992 “Exploring the Diversity of Extrasolar Planets” (TS 356/3-1). The project is supported by the European Union’s Horizon 2020 research and innovation program under grant agreement 101004719. We acknowledge the support from the European Union’s research and innovation programmes under grant agreements No. 101004719 (OPTICON-RadioNet Pilot, ORP) and No. 101131928 (ACME). We acknowledge the support from the Polish National Science Centre NCN grant DAINA No 2024/52/L/ST9/00210. This work was partially supported by a program of the Polish Ministry of Science under the title ‘Regional Excellence Initiative’, project no. RID/SP/0050/2024/1. R.F.J. acknowledges support for this project provided by ANID’s Millennium Science Initiative through grant ICN12_009, awarded to the Millennium Institute of Astrophysics (MAS), and by ANID’s Basal project FB210003.

PY - 2025/5/7

Y1 - 2025/5/7

N2 - 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.

AB - 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.

KW - Gravitational lensing: micro

KW - Methods: observational

KW - Techniques: photometric

KW - Techniques: spectroscopic

KW - Planets and satellites: detection

U2 - 10.1051/0004-6361/202554236

DO - 10.1051/0004-6361/202554236

M3 - Article

SN - 0004-6361

VL - 697

JO - Astronomy & Astrophysics

JF - Astronomy & Astrophysics

M1 - A57

ER -

AT2021uey: a planetary microlensing event outside the galactic bulge

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Keywords

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Projects

ORP: Opticon RadioNet Pilot: ORP: Opticon RadioNet Pilot

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