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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
KMT-2021-BLG-1547Lb: Giant microlensing planet detected through a signal deformed due to source binarity
Astronomy and Astrophysics, Volume 678, Article A101, Year 2023
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Description
Aims. We investigate the previous microlensing data collected by the KMTNet survey in search of anomalous events for which no precise interpretations of the anomalies had been suggested. From this investigation, we find that the anomaly in the lensing light curve of the event KMT-2021-BLG-1547 is approximately described by a binary-lens (2L1S) model with a lens possessing a giant planet, but the model leaves unexplained residuals. Methods. We investigated the origin of the residuals by testing more sophisticated models that include either an extra lens component (3L1S model) or an extra source star (2L2S model) on top of the 2L1S configuration of the lens system. From these analyses, we find that the residuals from the 2L1S model originate from the existence of a faint companion to the source. The 2L2S solution substantially reduces the residuals and improves the model fit by δ x 2 = 67.1 with respect to the 2L1S solution. The 3L1S solution also improves the fit, but its fit is worse than that of the 2L2S solution by δ x 2 = 24.7. Results. According to the 2L2S solution, the lens of the event is a planetary system with planet and host masses (Mp/MJ, Mh/M·) = (1.47-0.77+0.64, 0.72-0.38+0.32) lying at a distance DL = 5.07-1.50+0.98 kpc, and the source is a binary composed of a subgiant primary of a late G or an early K spectral type and a main-sequence companion of a K spectral type. The event demonstrates the need for sophisticated modeling of unexplained anomalies if one wants to construct a complete microlensing planet sample. © 2023 The Authors.
Authors & Co-Authors
Han, Cheongho
South Korea, Cheongju
Chungbuk National University
Zang, Weicheng
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
China, Beijing
Tsinghua University
Jung, Younkil
South Korea, Daejeon
Korea Astronomy and Space Science Institute
South Korea, Daejeon
University of Science and Technology Ust
Bond, Ian A.
New Zealand, Auckland
Massey University Auckland
Chung, Sun-ju
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Albrow, Michael D.
New Zealand, Christchurch
University of Canterbury
Gould, Andrew P.
Germany, Heidelberg
Max Planck Institute for Astronomy
United States, Columbus
The Ohio State University
Hwang, Kyu-ha
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Ryu, Yoon-hyun
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Shin, In-gu
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Shvartzvald, Yossi
Israel, Rehovot
Weizmann Institute of Science Israel
Yang, Hongjing
China, Beijing
Tsinghua University
Yee, Jennifer C.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Cha, Sang-mok
South Korea, Daejeon
Korea Astronomy and Space Science Institute
South Korea, Seoul
Kyung Hee University
Kim, Doeon
South Korea, Cheongju
Chungbuk National University
Kim, Dongjin
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Kim, Seung-lee
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Lee, Chung-uk
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Lee, Dong-joo
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Lee, Yongseok
South Korea, Daejeon
Korea Astronomy and Space Science Institute
South Korea, Seoul
Kyung Hee University
Park, Byeong-gon
South Korea, Daejeon
Korea Astronomy and Space Science Institute
Pogge, Richard W.
United States, Columbus
The Ohio State University
Monard, Berto L.A.G.
South Africa, Pretoria
Bronberg Observatory
Maoz, Dan
Israel, Tel Aviv-yafo
Tel Aviv University
Penny, Matthew T.
United States, Baton Rouge
Louisiana State University
Zhu, Wei
China, Beijing
Tsinghua University
Abe, Fumio
Japan, Nagoya
Nagoya University
Barry, Richard K.
United States, Greenbelt
Nasa Goddard Space Flight Center
Bennett, David P.
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Bhattacharya, Aparna
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Fujii, Hirosane
Japan, Nagoya
Nagoya University
Fukui, Akihiko
Japan, Tokyo
The University of Tokyo
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Hirao, Yuki
Japan, Tokyo
The University of Tokyo
Itow, Yoshitaka
Japan, Nagoya
Nagoya University
Kirikawa, Rintaro
Japan, Suita
Osaka University
Kondo, Iona
Japan, Suita
Osaka University
Koshimoto, Naoki
Japan, Tokyo
The University of Tokyo
Matsubara, Yutaka
Japan, Nagoya
Nagoya University
Miyazaki, Shota
Japan, Chofu
Japan Aerospace Exploration Agency
Muraki, Y.
Japan, Nagoya
Nagoya University
Olmschenk, Greg
United States, Greenbelt
Nasa Goddard Space Flight Center
Ranc, Clément
France, Paris
Sorbonne Université
Rattenbury, Nicholas James
New Zealand, Auckland
The University of Auckland
Satoh, Yuki
Japan, Suita
Osaka University
Sumi, Takahiro
Japan, Suita
Osaka University
Suzuki, Daisuke
Japan, Suita
Osaka University
Tristram, Paul J.
New Zealand, Christchurch
University of Canterbury
Vandorou, Aikaterini
United States, Greenbelt
Nasa Goddard Space Flight Center
United States, College Park
University of Maryland, College Park
Yama, Hibiki
Japan, Suita
Osaka University
Statistics
Authors: 49
Affiliations: 25
Identifiers
Doi:
10.1051/0004-6361/202347366
ISSN:
00046361
Study Design
Cross Sectional Study
Study Approach
Quantitative