MOA-2022-BLG-249Lb: Nearby microlensing super-Earth planet detected from high-cadence surveys
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Date
2023-06
Open Access Location
Journal Title
Journal ISSN
Volume Title
Publisher
EDP Sciences for The European Southern Observatory
Rights
(c) 2023 The Author/s
CC BY 4.0
CC BY 4.0
Abstract
Aims. We investigate the data collected by the high-cadence microlensing surveys during the 2022 season in search of planetary signals appearing in the light curves of microlensing events. From this search, we find that the lensing event MOA-2022-BLG-249 exhibits a brief positive anomaly that lasted for about one day, with a maximum deviatio
Methods. We analyzed the light curve under the two interpretations of the anomaly: one originated by a low-mass companion to the lens (planetary model) and the other originated by a faint companion to the source (binary-source model).
Results. We find that the anomaly is better explained by the planetary model than the binary-source model. We identified two solutions rooted in the inner-outer degeneracy and for both of them, the estimated planet-To-host mass ratio, q ~ 8 A-10' 5, is very small. With the constraints provided by the microlens parallax and the lower limit on the Einstein radius, as well as the blend-flux constraint, we find that the lens is a planetary system, in which a super-Earth planet, with a mass of (4.83 ± 1.44) M·, orbits a low-mass host star, with a mass of (0.18 ± 0.05) M·, lying in the Galactic disk at a distance of (2.00 ± 0.42) kpc. The planet detection demonstrates the elevated microlensing sensitivity of the current high-cadence lensing surveys to low-mass planets.
Description
Keywords
planets and satellites, general
Citation
Han C, Gould A, Jung YK, Bond IA, Zang W, Chung SJ, Albrow MD, Hwang KH, Ryu YH, Shin IG, Shvartzvald Y, Yang H, Yee JC, Cha SM, Kim D, Kim DJ, Kim SL, Lee CU, 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, Matsumoto S, Miyazaki S, Muraki Y, Okamura A, 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). MOA-2022-BLG-249Lb: Nearby microlensing super-Earth planet detected from high-cadence surveys. Astronomy and Astrophysics. 674. June 2023.