KMT-2018-BLG-1025Lb: Microlensing super-Earth planet orbiting a low-mass star (2021)
Aims. We aim to find missing microlensing planets hidden in the unanalyzed lensing events of previous survey data. Methods. For this purpose, we conducted a systematic inspection of high-magnification microlensing events, with peak magnifications of Apeak ≳ 30, in the data collected from high-cadence surveys in and before the 2018 season. From this investigation, we identified an anomaly in the lensing light curve of the event KMT-2018-BLG-1025. The analysis of the light curve indicates that the anomaly is caused by a very low mass-ratio companion to the lens. Results. We identify three degenerate solutions, in which the ambiguity between a pair of solutions (solutions B) is caused by the previously known close-wide degeneracy, and the degeneracy between these and the other solution (solution A) is a new type that has not been reported before. The estimated mass ratio between the planet and host is q ∼ 0.8 × 10-4 for solution A and q ∼ 1.6 × 10-4 for solutions B. From the Bayesian analysis conducted with measured observables, we estimate that the masses of the planet and host and the distance to the lens are (Mp, Mh, DL) ∼ (6.1 Mpdbl, 0.22 Mpdbl, 6.7 kpc) for solution A and ∼(4.4 Mpdbl, 0.08 Mpdbl, 7.5 kpc) for solutions B. The planet mass is in the category of a super-Earth regardless of the solutions, making the planet the eleventh super-Earth planet, with masses lying between those of Earth and the Solar System's ice giants, which were discovered by microlensing.
CitationHan C, Udalski A, Lee CU, Albrow MD, Chung SJ, Gould A, Hwang KH, Jung YK, Kim D, Kim HW, Ryu YH, Shin IG, Shvartzvald Y, Yee JC, Zang W, Cha SM, Kim DJ, Kim SL, Lee DJ, Lee Y, Park BG, Pogge RW, Kim CH, Kim WT, Mróz P, Szymański MK, Skowron J, Poleski R, Soszyński I, Pietrukowicz P, Kozłowski S, Ulaczyk K, Rybicki KA, Iwanek P, Wrona M (2021). KMT-2018-BLG-1025Lb: Microlensing super-Earth planet orbiting a low-mass star. Astronomy and Astrophysics. 649. A90-A90.
This citation is automatically generated and may be unreliable. Use as a guide only.
Keywordsastro-ph.EP; astro-ph.GA; astro-ph.IM; gravitational microlensing – planets and satellites: detection
ANZSRC Fields of Research51 - Physical sciences::5101 - Astronomical sciences::510109 - Stellar astronomy and planetary systems
51 - Physical sciences::5101 - Astronomical sciences::510102 - Astronomical instrumentation
RightsAll rights reserved unless otherwise stated
Showing items related by title, author, creator and subject.
OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through Planetary-Caustic Channel Jung YK; Han C; Udalski A; Gould A; Yee JC; Chung S-J; Hwang K-H; Ryu Y-H; Shin I-G; Shvartzvald Y; Zhu W; Zang W; Cha S-M; Kim D-J; Kim H-W; Kim S-L; Lee C-U; Lee D-J; Lee Y; Park B-G; Mróz RWPP; Szymański MK; Skowron J; Poleski R; Soszyński I; Pietrukowicz P; Kozłowski S; Ulaczyk K; Rybicki KA; Iwanek P; Wrona M; Albrow, Michael (American Astronomical Society, 2021)We present the analyses of two microlensing events, OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962. In both events, the short-lasting anomalies were densely and continuously covered by two high-cadence surveys. The light-curve ...
KMT-2015-1b: a Giant Planet Orbiting a Low-mass Dwarf Host Star Discovered by a New High-cadence Microlensing Survey with a Global Telescope Network Hwang K-H; Han C; Choi J-Y; Park H; Jung YK; Shin I-G; Albrow MD; Gould A; Bozza V; Park B-G; Kim S-L; Lee C-U; Cha S-M; Kim D-J; Lee Y (2018)We report the discovery of an extrasolar planet, KMT-2015-1b, that was detected using the microlensing technique. The planetary lensing event was observed by KMTNet survey that has commenced in 2015. With dense coverage ...
Systematic KMTNet Planetary Anomaly Search, Paper I: OGLE-2019-BLG-1053Lb, A Buried Terrestrial Planet Zang W; Hwang K-H; Udalski A; Wang T; Zhu W; Sumi T; Gould A; Mao S; Zhang X; Chung S-J; Han C; Jung YK; Ryu Y-H; Shin I-G; Shvartzvald Y; Yee JC; Cha S-M; Kim D-J; Kim H-W; Kim S-L; Lee C-U; Lee D-J; Lee Y; Park B-G; Pogge RW; Mróz P; Skowron J; Szymański MK; Soszyński I; Pietrukowicz P; Kozłowski S; Ulaczyk K; Rybicki KA; Iwanek P; Wrona M; Gromadzki M; Bond IA; Abe F; Barry R; Bennett DP; Bhattacharya A; Donachie M; Fujii H; Fukui A; Hirao Y; Itow Y; Kirikawa R; Kondo I; Koshimoto N; Li MCA; Matsubara Y; Muraki Y; Miyazaki S; Olmschenk G; Ranc C; Rattenbury NJ; Satoh Y; Shoji H; Silva SI; Suzuki D; Tanaka Y; Tristram PJ; Yamawaki T; Yonehara A; Albrow, Michael (2021)In order to exhume the buried signatures of "missing planetary caustics'' in the KMTNet data, we conducted a systematic anomaly search to the residuals from point-source point-lens fits, based on a modified version of ...