Author:
Han Cheongho,Lee Chung-Uk,Bond Ian A.,Zang Weicheng,Chung Sun-Ju,Albrow Michael D.,Gould Andrew,Hwang Kyu-Ha,Jung Youn Kil,Ryu Yoon-Hyun,Shin In-Gu,Shvartzvald Yossi,Yang Hongjing,Yee Jennifer C.,Cha Sang-Mok,Kim Doeon,Kim Dong-Jin,Kim Seung-Lee,Lee Dong-Joo,Lee Yongseok,Park Byeong-Gon,Pogge Richard W.,Mao Shude,Zhu Wei,Abe Fumio,Barry Richard,Bennett David P.,Bhattacharya Aparna,Fujii Hirosame,Fukui Akihiko,Hamada Ryusei,Hirao Yuki,Ishitani Silva Stela,Itow Yoshitaka,Kirikawa Rintaro,Kondo Iona,Koshimoto Naoki,Matsubara Yutaka,Miyazaki Shota,Muraki Yasushi,Olmschenk Greg,Ranc Clément,Rattenbury Nicholas J.,Satoh Yuki,Sumi Takahiro,Suzuki Daisuke,Toda Taiga,Tomoyoshi Mio,Tristram Paul J.,Vandorou Aikaterini,Yama Hibiki,Yamashita Kansuke
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 × 10−4 for KMT-2022-BLG-0475L and q ~ 4.3 × 10−4 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) = (0.43−0.23+0.35, 1.73−0.92+1.42, 2.03−0.38+0.25) for KMT-2022-BLG-0475L and (0.18−0.09+0.16, 1.82−0.92+1.60, 1.22−0.14+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.
Subject
Space and Planetary Science,Astronomy and Astrophysics