Four sub-Jovian-mass planets detected by high-cadence microlensing surveys
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Date
2022-08-05
Open Access Location
Journal Title
Journal ISSN
Volume Title
Publisher
EDP Sciences on behalf of the European Southern Observatory
Rights
CC BY 4.0
Abstract
Aims. With the aim of finding short-term planetary signals, we investigated the data collected from current high-cadence microlensing surveys.
Methods. From this investigation, we found four planetary systems with low planet-to-host mass ratios, including OGLE-2017-BLG-1691L, KMT-2021-BLG-0320L, KMT-2021-BLG-1303L, and KMT-2021-BLG-1554L. Despite the short durations, ranging from a few hours to a couple of days, the planetary signals were clearly detected by the combined data of the lensing surveys. We found that three of the planetary systems have mass ratios on the order of 10-4 and the other has a mass ratio that is slightly greater than 10-3.
Results. The estimated masses indicate that all discovered planets have sub-Jovian masses. The planet masses of KMT-2021-BLG-0320Lb, KMT-2021-BLG-1303Lb, and KMT-2021-BLG-1554Lb correspond to ∼0.10, ∼0.38, and ∼0.12 times the mass of the Jupiter, and the mass of OGLE-2017-BLG-1691Lb corresponds to that of the Uranus. The estimated mass of the planet host KMT-2021-BLG-1554L, Mhost ∼ 0.08 M⊙, corresponds to the boundary between a star and a brown dwarf. Besides this system, the host stars of the other planetary systems are low-mass stars with masses in the range of ∼[0.3-0.6] M⊙. The discoveries of the planets fully demonstrate the capability of the current high-cadence microlensing surveys in detecting low-mass planets.
Description
Keywords
planets and satellites, detection – gravitational lensing, micro
Citation
Han C, Kim D, Gould A, Udalski A, Bond IA, Bozza V, Jung YK, Albrow MD, Chung SJ, Hwang KH, Ryu YH, Shin IG, Shvartzvald Y, Yee JC, Zang W, Cha SM, Kim DJ, Kim SL, Lee CU, Lee DJ, Lee Y, Park BG, Pogge RW, Mróz P, Szymaåski MK, Skowron J, Poleski RA, Soszyåski I, Pietrukowicz P, Kozaowski S, Ulaczyk K, Rybicki KA, Iwanek P, Abe F, Barry RK, Bennett DP, Bhattacharya A, Fujii H, Fukui A, Hirao Y, Itow Y, Kirikawa R, Koshimoto N, Kondo I, Matsubara Y, Matsumoto S, Miyazaki S, Muraki Y, Olmschenk G, Okamura A, Ranc C, Rattenbury NJ, Satoh Y, Silva SI, Sumi T, Suzuki D, Toda T, Tristram PJ, Vandorou A, Yama H. (2022). Four sub-Jovian-mass planets detected by high-cadence microlensing surveys. Astronomy and Astrophysics. 664.