Systematic reanalysis of KMTNet microlensing events, paper I: Updates of the photometry pipeline and a new planet candidate

Yang HYee JCHwang K-HQian QBond IAGould AHu ZZhang JMao SZhu WAlbrow MDChung S-JKim S-LPark B-GHan CJung YKRyu Y-HShin I-GShvartzvald YCha S-MKim D-JKim H-WLee C-ULee D-JLee YPogge RWZang WAbe FBarry RBennett DPBhattacharya ADonachie MFujii HFukui AHirao YItow YKirikawa RKondo IKoshimoto NSilva SILi MCAMatsubara YMuraki YSuzuki DTristram PJYonehara ARanc CMiyazaki SOlmschenk GRattenbury NJSatoh YShoji HSumi TTanaka YYamawaki T2024-09-082024-09-082024-02-01Yang H, Yee JC, Hwang KH, Qian Q, Bond IA, Gould A, Hu Z, Zhang J, Mao S, Zhu W, Albrow MD, Chung SJ, Kim SL, Park BG, Han C, Jung YK, Ryu YH, Shin IG, Shvartzvald Y, Cha SM, Kim DJ, Kim HW, Lee CU, Lee DJ, Lee Y, Pogge RW, Zang W, Abe F, Barry R, Bennett DP, Bhattacharya A, Donachie M, Fujii H, Fukui A, Hirao Y, Itow Y, Kirikawa R, Kondo I, Koshimoto N, Silva SI, Li MCA, Matsubara Y, Muraki Y, Suzuki D, Tristram PJ, Yonehara A, Ranc C, Miyazaki S, Olmschenk G, Rattenbury NJ, Satoh Y, Shoji H, Sumi T, Tanaka Y, Yamawaki T. (2024). Systematic reanalysis of KMTNet microlensing events, paper I: Updates of the photometry pipeline and a new planet candidate. Monthly Notices of the Royal Astronomical Society. 528. 1. (pp. 11-27).0035-8711https://mro.massey.ac.nz/handle/10179/71426In this work, we update and develop algorithms for KMTNet tender-love care (TLC) photometry in order to create a new, mostly automated, TLC pipeline. We then start a project to systematically apply the new TLC pipeline to the historic KMTNet microlensing events, and search for buried planetary signals. We report the discovery of such a planet candidate in the microlensing event MOA-2019-BLG-421/KMT-2019-BLG-2991. The anomalous signal can be explained by either a planet around the lens star or the orbital motion of the source star. For the planetary interpretation, despite many degenerate solutions, the planet is most likely to be a Jovian planet orbiting an M or K dwarf, which is a typical microlensing planet. The discovery proves that the project can indeed increase the sensitivity of historic events and find previously undiscovered signals.(c) The author/shttps://creativecommons.org/licenses/by/4.0/gravitational lensing: microtechniques: photometricplanets and satellites: detectionSystematic reanalysis of KMTNet microlensing events, paper I: Updates of the photometry pipeline and a new planet candidateJournal article10.1093/mnras/stad36721365-2966CC BYjournal-article11-27