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KMT-2021-BLG-0322: Severe degeneracy between triple-lens and higher-order binary-lens interpretations

التفاصيل البيبلوغرافية
العنوان: KMT-2021-BLG-0322: Severe degeneracy between triple-lens and higher-order binary-lens interpretations
المؤلفون: Han, Cheongho, Gould, Andrew, Hirao, Yuki, Lee, Chung-Uk, Albrow, Michael D, Chung, Sun-Ju, Hwang, Kyu-Ha, Jung, Youn Kil, Kim, Doeon, Mao, Shude, Ryu, Yoon-Hyun, Shin, In-Gu, Shvartzvald, Yossi, Yee, Jennifer C, Zang, Weicheng, Cha, Sang-Mok, Kim, Dong-Jin, Kim, Hyoun-Woo, Kim, Seung-Lee, Lee, Dong-Joo, Lee, Yongseok, Park, Byeong-Gon, Pogge, Richard W, Abe, Fumio, Barry, Richard, Bennett, David P, Bhattacharya, Aparna, Bond, Ian, Donachie, Martin, Fujii, Hirosane, Fukui, Akihiko, Itow, Yoshitaka, Kirikawa, Rintaro, Kondo, Iona, Koshimoto, Naoki, Li, Man Cheung Alex, Matsubara, Yutaka, Muraki, Yasushi, Miyazaki, Shota, Ranc, Clément, Rattenbury, Nicholas J, Satoh, Yuki, Shoji, Hikaru, Sumi, Takahiro, Suzuki, Daisuke, Tanaka, Yuzuru, Tristram, Paul J, Yamawaki, Tsubasa, Yonehara, Atsunori
بيانات النشر: EDP Sciences
سنة النشر: 2023
المجموعة: University of Auckland Research Repository - ResearchSpace
مصطلحات موضوعية: Eye Disease and Disorders of Vision, Science & Technology, Physical Sciences, Astronomy & Astrophysics, gravitational lensing: micro, planets and satellites: general, GALACTIC BULGE, MICROLENSING EVENTS, PLANET, DWARF, PHOTOMETRY, NETWORK, astro-ph.EP, astro-ph.GA, astro-ph.IM, astro-ph.SR, 0201 Astronomical and Space Sciences
الوصف: Aims. We investigate the microlensing event KMT-2021-BLG-0322, for which the light curve exhibits three distinctive sets of caustic-crossing features. It is found that the overall features of the light curve are approximately described by a binary-lens (2L1S) model, but the model leaves substantial residuals. We test various interpretations with the aim of explaining the residuals. Methods. We find that the residuals can be explained either by considering a nonrectilinear lens-source motion caused by the microlens-parallax and lens-orbital effects or by adding a low-mass companion to the binary lens (3L1S model). The degeneracy between the higher-order 2L1S model and the 3L1S model is very severe, making it difficult to single out a correct solution based on the photometric data. This degeneracy was known before for two previous events (MACHO-97-BLG-41 and OGLE-2013-BLG-0723), which led to the false detections of planets in binary systems, and thus the identification of the degeneracy for KMT-2021-BLG-0322 illustrates that the degeneracy can be not only common but also very severe, emphasizing the need to check both interpretations of deviations from 2L1S models. Results. From the Bayesian analysis conducted with the measured lensing observables of the event timescale, angular Einstein radius, and microlens parallax, it was estimated that the binary lens components have masses (M1,M2) = (0.62−0.26+0.25 M⊙, 0.07−0.03+0.03 ...
نوع الوثيقة: article in journal/newspaper
وصف الملف: application/pdf
اللغة: English
تدمد: 0004-6361
1432-0746
Relation: Astronomy & Astrophysics; (2021). Astronomy and Astrophysics: a European journal, 655, a24-.; https://hdl.handle.net/2292/63281
DOI: 10.1051/0004-6361/202141939
الاتاحة: https://hdl.handle.net/2292/63281
https://doi.org/10.1051/0004-6361/202141939
Rights: Items in ResearchSpace are protected by copyright, with all rights reserved, unless otherwise indicated. Previously published items are made available in accordance with the copyright policy of the publisher. ; https://researchspace.auckland.ac.nz/docs/uoa-docs/rights.htm ; https://creativecommons.org/licenses/by/4.0/ ; Copyright: ESO ; http://purl.org/eprint/accessRights/OpenAccess
رقم الانضمام: edsbas.5D27508C
قاعدة البيانات: BASE
الوصف
تدمد:00046361
14320746
DOI:10.1051/0004-6361/202141939