OGLE-2019-BLG-0825: Constraints on the Source System and Effect on Binary-lens Parameters Arising from a Five-day Xallarap Effect in a Candidate Planetary Microlensing Event
Author:
Satoh Yuki K.ORCID, Koshimoto NaokiORCID, Bennett David P.ORCID, Sumi TakahiroORCID, Rattenbury Nicholas J.ORCID, Suzuki DaisukeORCID, Miyazaki ShotaORCID, Bond Ian A., Udalski AndrzejORCID, Gould Andrew, Bozza ValerioORCID, Dominik MartinORCID, Hirao YukiORCID, Kondo IonaORCID, Kirikawa Rintaro, Hamada Ryusei, Abe Fumio, Barry RichardORCID, Bhattacharya Aparna, Fujii Hirosane, Fukui AkihikoORCID, Fujita Katsuki, Ikeno Tomoya, Ishitani Silva StelaORCID, Itow YoshitakaORCID, Matsubara YutakaORCID, Matsumoto Sho, Muraki YasushiORCID, Niwa Kosuke, Okamura Arisa, Olmschenk GregORCID, Ranc ClémentORCID, Toda Taiga, Tomoyoshi Mio, Tristram Paul J., Vandorou AikateriniORCID, Yama Hibiki, Yamashita Kansuke, Mróz PrzemekORCID, Poleski RadosławORCID, Skowron JanORCID, Szymański Michał K.ORCID, Poleski Radek, Soszyński IgorORCID, Pietrukowicz PawełORCID, Kozłowski SzymonORCID, Ulaczyk KrzysztofORCID, Rybicki Krzysztof A.ORCID, Iwanek PatrykORCID, Wrona MarcinORCID, Gromadzki MariuszORCID, Albrow Michael D.ORCID, Chung Sun-JuORCID, Han CheonghoORCID, Hwang Kyu-HaORCID, Kim Doeon, Jung Youn Kil, Kim Hyoun Woo, Ryu Yoon-HyunORCID, Shin In-GuORCID, Shvartzvald YossiORCID, Yang HongjingORCID, Yee Jennifer C.ORCID, Zang WeichengORCID, Cha Sang-Mok, Kim Dong-Jin, Kim Seung-LeeORCID, Lee Chung-UkORCID, Lee Dong-Joo, Lee Yongseok, Park Byeong-GonORCID, Pogge Richard W.ORCID, Jørgensen Uffe G.ORCID, Longa-Peña Penélope, Sajadian SedigheORCID, Skottfelt JesperORCID, Snodgrass ColinORCID, Tregloan-Reed JeremyORCID, Bach-Møller NannaORCID, Burgdorf MartinORCID, D’Ago GiuseppeORCID, Haikala LauriORCID, Hitchcock JamesORCID, Hundertmark MarkusORCID, Khalouei Elahe, Peixinho NunoORCID, Rahvar SohrabORCID, Southworth JohnORCID, Spyratos Petros, , , , ,
Abstract
Abstract
We present an analysis of microlensing event OGLE-2019-BLG-0825. This event was identified as a planetary candidate by preliminary modeling. We find that significant residuals from the best-fit static binary-lens model exist and a xallarap effect can fit the residuals very well and significantly improves χ
2 values. On the other hand, by including the xallarap effect in our models, we find that binary-lens parameters such as mass ratio, q, and separation, s, cannot be constrained well. However, we also find that the parameters for the source system such as the orbital period and semimajor axis are consistent between all the models we analyzed. We therefore constrain the properties of the source system better than the properties of the lens system. The source system comprises a G-type main-sequence star orbited by a brown dwarf with a period of P ∼ 5 days. This analysis is the first to demonstrate that the xallarap effect does affect binary-lens parameters in planetary events. It would not be common for the presence or absence of the xallarap effect to affect lens parameters in events with long orbital periods of the source system or events with transits to caustics, but in other cases, such as this event, the xallarap effect can affect binary-lens parameters.
Funder
MEXT ∣ Japan Society for the Promotion of Science United States–Israel Binational Science Foundation National Science Foundation EC ∣ Horizon Europe ∣ Excellent Science ∣ HORIZON EUROPE Marie Sklodowska-Curie Actions Novo Nordisk Foundation Center for Basic Metabolic Research Carlsbergfondet MEC ∣ Fundação para a Ciência e a Tecnologia
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
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