Six microlensing planets detected via sub-day signals during the 2023–2024 season

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dc.citation.volume702
dc.contributor.authorHan C
dc.contributor.authorLee C-U
dc.contributor.authorUdalski A
dc.contributor.authorBond IA
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.authorYang H
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.authorBennett DP
dc.contributor.authorBhattacharya A
dc.contributor.authorFukui A
dc.contributor.authorHamada R
dc.contributor.authorSilva SI
dc.contributor.authorHirao Y
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.date.accessioned2025-11-13T00:51:44Z
dc.date.issued2025-10
dc.description.abstractAims. We present analyses of six microlensing events: KMT-2023-BLG-0548, KMT-2023-BLG-0830, KMT-2023-BLG-0949, KMT-2024-BLG-1281, KMT-2024-BLG-2059, and KMT-2024-BLG-2242. These were identified in KMTNet data from the 2023–2024 seasons, selected for exhibiting anomalies shorter than one day – potential signatures of low-mass planetary companions. Motivated by this, we conducted detailed investigations to characterize the nature of the observed perturbations. Methods. Detailed modeling of the light curves reveals that the anomalies in all six events are caused by planetary companions to the lenses. The brief durations of the anomalies are attributed to various factors: a low planet-to-host mass ratio (KMT-2024-BLG-2059, KMT-2024-BLG-2242), a wide planet-host separation (KMT-2023-BLG-0548), small and elongated caustics restricting the source’s interaction region (KMT-2023-BLG-0830, KMT-2024-BLG-1281), and a partial caustic crossing (KMT-2023-BLG-0949). Results. We estimated the physical parameters of the lens systems using Bayesian analysis. For KMT-2023-BLG-0548, the posterior distribution of the lens mass shows two distinct peaks: a low-mass solution indicating a sub-Jovian planet orbiting an M dwarf in the Galactic disk, and a high-mass solution suggesting a super-Jovian planet around a K-type dwarf in the bulge. KMT-2023-BLG-0830 hosts a Neptune-mass planet orbiting an M dwarf in the Galactic bulge. KMT-2023-BLG-0949 involves a super-Jovian planet orbiting a ∼0.5 M<inf>☉</inf> host located at ∼6 kpc. KMT-2024-BLG-2059Lb is a super-Earth with a mass about seven times that of Earth, orbiting an early M dwarf of ∼0.5 M<inf>☉</inf>. KMT-2024-BLG-1281L hosts a planet slightly more massive than Neptune, orbiting an M dwarf of ∼0.3 M<inf>☉</inf>. The short timescale and small angular Einstein radius of KMT-2024-BLG-2242 suggest a ∼0.07 M<inf>☉</inf> primary, likely a brown dwarf, with a planet of Uranus- or Neptune-like mass.
dc.description.confidentialfalse
dc.edition.editionOctober 2025
dc.identifier.author-urlhttps://orcid.org/0000-0002-8131-8891
dc.identifier.citationHan C, Lee CU, Udalski A, Bond IA, Albrow MD, Chung SJ, Gould A, Jung YK, Hwang KH, Ryu YH, Shvartzvald Y, Shin IG, Yee JC, Zang W, Yang H, 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, Bennett DP, Bhattacharya A, Fukui A, Hamada R, Silva SI, Hirao Y, 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. (2025). Six microlensing planets detected via sub-day signals during the 2023–2024 season. Astronomy and Astrophysics. 702.
dc.identifier.doi10.1051/0004-6361/202554557
dc.identifier.eissn1432-0746
dc.identifier.elements-typejournal-article
dc.identifier.issn0004-6361
dc.identifier.numberA152
dc.identifier.urihttps://mro.massey.ac.nz/handle/10179/73818
dc.languageEnglish
dc.publisherEDP Sciences on behalf of The European Southern Observatory (Ulis, France)
dc.publisher.urihttps://www.aanda.org/articles/aa/full_html/2025/10/aa54557-25/aa54557-25.html
dc.relation.isPartOfAstronomy and Astrophysics
dc.rightsCC BY 4.0
dc.rights(c) The Author/s
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectgravitational lensing
dc.subjectmicro / planets and satellites
dc.subjectdetection
dc.titleSix microlensing planets detected via sub-day signals during the 2023–2024 season
dc.typeJournal article
pubs.elements-id608046
pubs.organisational-groupOther

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