AT2021uey: A planetary microlensing event outside the Galactic bulge

IF 5.4 2区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Astronomy & Astrophysics Pub Date : 2025-05-07 DOI:10.1051/0004-6361/202554236

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, 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 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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AT2021uey：银河系凸起外的行星微透镜事件

我们报告了对AT2021uey行星微透镜事件的分析。这一事件是在银河系凸起的外部观测到的，并提醒了太空（盖亚）和地面（ZTF和ASAS-SN）的调查。从观测数据中，我们发现透镜系统位于距离约1 kpc的地方，由一颗质量约为太阳一半的m -矮主星组成，在雪线之外由一颗类似木星的行星环绕。根据光谱分析和模型，源恒星可能是位于光晕中的一颗金属贫乏的巨星。因此，AT2021uey是由圆盘-光晕透镜-源组合提供的凸起外双透镜事件的独特例子。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Astronomy & Astrophysics 地学天文-天文与天体物理

CiteScore
10.20

自引率
27.70%

发文量
2105

审稿时长
1-2 weeks

期刊介绍： Astronomy & Astrophysics is an international Journal that publishes papers on all aspects of astronomy and astrophysics (theoretical, observational, and instrumental) independently of the techniques used to obtain the results.

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