MOA-2022-BLG-091Lb and KMT-2024-BLG-1209Lb: Microlensing planets detected through weak caustic-crossing signals

Simple item page
dc.citation.volume699
dc.contributor.authorHan C
dc.contributor.authorLee C-U
dc.contributor.authorUdalski A
dc.contributor.authorBond IA
dc.contributor.authorYang H
dc.contributor.authorAlbrow MD
dc.contributor.authorChung S-J
dc.contributor.authorGould A
dc.contributor.authorJung YK
dc.contributor.authorHwang K-H
dc.contributor.authorRyu Y-H
dc.contributor.authorShvartzvald Y
dc.contributor.authorShin I-G
dc.contributor.authorYee JC
dc.contributor.authorZang W
dc.contributor.authorInyanya T
dc.contributor.authorCha S-M
dc.contributor.authorKim D
dc.contributor.authorKim D-J
dc.contributor.authorKim S-L
dc.contributor.authorLee D-J
dc.contributor.authorLee Y
dc.contributor.authorPark B-G
dc.contributor.authorPogge RW
dc.contributor.authorMróz P
dc.contributor.authorSzymański MK
dc.contributor.authorSkowron J
dc.contributor.authorPoleski R
dc.contributor.authorSoszyński I
dc.contributor.authorPietrukowicz P
dc.contributor.authorKozłowski S
dc.contributor.authorRybicki KA
dc.contributor.authorIwanek P
dc.contributor.authorUlaczyk K
dc.contributor.authorWrona M
dc.contributor.authorGromadzki M
dc.contributor.authorMróz MJ
dc.contributor.authorJaroszyński M
dc.contributor.authorKiraga M
dc.contributor.authorAbe F
dc.contributor.authorBando K
dc.contributor.authorBennett DP
dc.contributor.authorBhattacharya A
dc.contributor.authorFukui A
dc.contributor.authorHamada R
dc.contributor.authorHamada S
dc.contributor.authorHamasaki N
dc.contributor.authorHirao Y
dc.contributor.authorIshitani Silva S
dc.contributor.authorKoshimoto N
dc.contributor.authorMatsubara Y
dc.contributor.authorMiyazaki S
dc.contributor.authorMuraki Y
dc.contributor.authorNagai T
dc.contributor.authorNunota K
dc.contributor.authorOlmschenk G
dc.contributor.authorRanc C
dc.contributor.authorRattenbury NJ
dc.contributor.authorSatoh Y
dc.contributor.authorSumi T
dc.contributor.authorSuzuki D
dc.contributor.authorTerry SK
dc.contributor.authorTristram PJ
dc.contributor.authorVandorou A
dc.contributor.authorYama H
dc.contributor.authorTang Y
dc.contributor.authorMao S
dc.contributor.authorMaoz D
dc.contributor.authorZhu W
dc.date.accessioned2025-09-04T02:33:24Z
dc.date.available2025-09-04T02:33:24Z
dc.date.issued2025-07-01
dc.description.abstractAims. The light curves of the microlensing events MOA-2022-BLG-091 and KMT-2024-BLG-1209 exhibit anomalies with very similar features. These anomalies appear near the peaks of the light curves, where the magnifications are moderately high, and are distinguished by weak caustic-crossing features with minimal distortion while the source remains inside the caustic. To achieve a deeper understanding of these anomalies, we conducted a comprehensive analysis of the lensing events. Methods. We carried out binary-lens modeling with a thorough exploration of the parameter space. This analysis revealed that the anomalies in both events are of planetary origin, although their exact interpretation is complicated by different types of degeneracy. In the case of MOA-2022-BLG-091, the main difficulty in the interpretation of the anomaly arises from a newly identified degeneracy related to the uncertain angle at which the source trajectory intersects the planet host axis. For KMT-2024-BLG-1209, the interpretation is affected by the previously known inner-outer degeneracy, which leads to ambiguity between solutions in which the source passes through either the inner or outer caustic region relative to the planet host. Results. Bayesian analysis indicates that the planets in both lens systems are giant planets with masses about two to four times that of Jupiter, orbiting early K-type main-sequence stars. Both systems are likely located in the Galactic disk at a distance of around 4 kiloparsecs. The degeneracy in KMT-2024-BLG-1209 is challenging to resolve because it stems from intrinsic similarities in the caustic structures of the degenerate solutions. In contrast, the degeneracy in MOA-2022-BLG-091, which occurs by chance rather than from inherent characteristics, is expected to be resolved by the future space based Roman RGES microlensing survey.
dc.description.confidentialfalse
dc.edition.editionJuly 2025
dc.identifier.citationHan C, Lee CU, Udalski A, Bond IA, Yang H, Albrow MD, Chung SJ, Gould A, Jung YK, Hwang KH, Ryu YH, Shvartzvald Y, Shin IG, Yee JC, Zang W, Inyanya T, Cha SM, Kim D, Kim DJ, Kim SL, Lee DJ, Lee Y, Park BG, Pogge RW, Mróz P, Szymański MK, Skowron J, Poleski R, Soszyński I, Pietrukowicz P, Kozłowski S, Rybicki KA, Iwanek P, Ulaczyk K, Wrona M, Gromadzki M, Mróz MJ, Jaroszyński M, Kiraga M, Abe F, Bando K, Bennett DP, Bhattacharya A, Fukui A, Hamada R, Hamada S, Hamasaki N, Hirao Y, Ishitani Silva S, Koshimoto N, Matsubara Y, Miyazaki S, Muraki Y, Nagai T, Nunota K, Olmschenk G, Ranc C, Rattenbury NJ, Satoh Y, Sumi T, Suzuki D, Terry SK, Tristram PJ, Vandorou A, Yama H, Tang Y, Mao S, Maoz D, Zhu W. (2025). MOA-2022-BLG-091Lb and KMT-2024-BLG-1209Lb: Microlensing planets detected through weak caustic-crossing signals. Astronomy and Astrophysics. 699.
dc.identifier.doi10.1051/0004-6361/202554182
dc.identifier.eissn1432-0746
dc.identifier.elements-typejournal-article
dc.identifier.issn0004-6361
dc.identifier.numberA91
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/73484
dc.languageEnglish
dc.publisherEDP Sciences
dc.publisher.urihttps://www.aanda.org/articles/aa/full_html/2025/07/aa54182-25/aa54182-25.html
dc.relation.isPartOfAstronomy and Astrophysics
dc.rights(c) 2025 The Author/s
dc.rightsCC BY 4.0
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectgravitational lensing: micro
dc.subjectplanets and satellites: detection
dc.titleMOA-2022-BLG-091Lb and KMT-2024-BLG-1209Lb: Microlensing planets detected through weak caustic-crossing signals
dc.typeJournal article
pubs.elements-id501639
pubs.organisational-groupOther
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
501639 PDF.pdf
Size:
1.9 MB
Format:
Adobe Portable Document Format
Description:
Published version.pdf
Download
License bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
license.txt
Size:
9.22 KB
Format:
Plain Text
Description:
Download
Collections
Journal Articles