KMT-2022-BLG-0475Lb and KMT-2022-BLG-1480Lb: Microlensing ice giants detected via the non-caustic-crossing channel
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Date
2023-08
Open Access Location
Journal Title
Journal ISSN
Volume Title
Publisher
EDP Sciences, France
Rights
(c) 2023 The Author/s
CC BY 4.0
CC BY 4.0
Abstract
Aims. We investigate the microlensing data collected in the 2022 season from high-cadence microlensing surveys in order to find weak signals produced by planetary companions to lenses.
Methods. From these searches, we find that two lensing events, KMT-2022-BLG-0475 and KMT-2022-BLG-1480, exhibit weak short-term anomalies. From a detailed modeling of the lensing light curves, we determine that the anomalies are produced by planetary companions with a mass ratio to the primary of q 1.8 A-104 for KMT-2022-BLG-0475L and q 4.3 A-104 for KMT-2022-BLG-1480L.
Results. We estimate that the host and planet masses and the projected planet-host separation are (Mh/M, Mp/MU, a/au) = (0.430.23+0.35, 1.730.92+1.42, 2.030.38+0.25) for KMT-2022-BLG-0475L and (0.180.09+0.16, 1.820.92+1.60, 1.220.14+0.15) for KMT-2022-BLG-1480L, where MU denotes the mass of Uranus. The two planetary systems have some characteristics in common: the primaries of the lenses are early-mid M dwarfs that lie in the Galactic bulge, and the companions are ice giants that lie beyond the snow lines of the planetary systems.
Description
Keywords
planets and satellites, detection / gravitational lensing, micro
Citation
Han C, Lee CU, Bond IA, Zang W, Chung SJ, Albrow MD, Gould A, Hwang KH, Jung YK, Ryu YH, Shin IG, Shvartzvald Y, Yang H, Yee JC, Cha SM, Kim D, Kim DJ, Kim SL, Lee DJ, Lee Y, Park BG, Pogge RW, Mao S, Zhu W, Abe F, Barry R, Bennett DP, Bhattacharya A, Fujii H, Fukui A, Hamada R, Hirao Y, Ishitani Silva S, Itow Y, Kirikawa R, Kondo I, Koshimoto N, Matsubara Y, Miyazaki S, Muraki Y, Olmschenk G, Ranc C, Rattenbury NJ, Satoh Y, Sumi T, Suzuki D, Toda T, Tomoyoshi M, Tristram PJ, Vandorou A, Yama H, Yamashita K. (2023). KMT-2022-BLG-0475Lb and KMT-2022-BLG-1480Lb: Microlensing ice giants detected via the non-caustic-crossing channel. Astronomy and Astrophysics. 676. August 2023.