OGLE-2023-BLG-0836L: The sixth microlensing planet in a binary stellar system
Aims . Light curves of microlensing events occasionally deviate from the smooth and symmetric form of a single-lens single-source event. While most of these anomalous events can be accounted for by employing a binary-lens single-source (2L 1S) or a single-lens binary-source (1L2S) framework, it is e...
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Veröffentlicht in: | Astronomy and astrophysics (Berlin) 2024-05, Vol.685, p.A16 |
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Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
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Zusammenfassung: | Aims
. Light curves of microlensing events occasionally deviate from the smooth and symmetric form of a single-lens single-source event. While most of these anomalous events can be accounted for by employing a binary-lens single-source (2L 1S) or a single-lens binary-source (1L2S) framework, it is established that a small fraction of events remain unexplained by either of these interpretations. We carried out a project in which data collected by high-cadence microlensing surveys were reinvestigated with the aim of uncovering the nature of anomalous lensing events with no proposed 2L 1S or 1L 2S models.
Methods
. From the project we found that the anomaly appearing in the lensing event OGLE-2023-BLG-0836 cannot be explained by the usual interpretations, and we conducted a comprehensive analysis of the event. From thorough modeling of the light curve under sophisticated lens-system configurations, we arrived at the conclusion that a triple-mass lens system is imperative to account for the anomalous features observed in the lensing light curve.
Results
. From the Bayesian analysis using the measured observables of the event timescale and angular Einstein radius, we determined that the least massive component of the lens has a planetary mass of 4.36
−2.18
+2.35
M
J
. This planet orbits within a stellar binary system composed of two stars with masses 0.71
−0.36
+0.38
M
⊙
and 0.56
−0.28
+0.30
M
⊙
. This lensing event signifies the sixth occurrence of a planetary microlensing system in which a planet belongs to a stellar binary system. |
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ISSN: | 0004-6361 1432-0746 |
DOI: | 10.1051/0004-6361/202348791 |