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

Satoh, Yuki K. and Koshimoto, Naoki and Bennett, David P. and Sumi, Takahiro and Rattenbury, Nicholas J. and Suzuki, Daisuke and Miyazaki, Shota and Bond, Ian A. and Udalski, Andrzej and Gould, Andrew and Bozza, Valerio and Dominik, Martin and Hirao, Yuki and Kondo, Iona and Kirikawa, Rintaro and Hamada, Ryusei and Abe, Fumio and Barry, Richard and Bhattacharya, Aparna and Fujii, Hirosane and Fukui, Akihiko and Fujita, Katsuki and Ikeno, Tomoya and Ishitani Silva, Stela and Itow, Yoshitaka and Matsubara, Yutaka and Matsumoto, Sho and Muraki, Yasushi and Niwa, Kosuke and Okamura, Arisa and Olmschenk, Greg and Ranc, Clément and Toda, Taiga and Tomoyoshi, Mio and Tristram, Paul J. and Vandorou, Aikaterini and Yama, Hibiki and Yamashita, Kansuke and Mróz, Przemek and Poleski, Radosław and Skowron, Jan and Szymański, Michał K. and Poleski, Radek and Soszyński, Igor and Pietrukowicz, Paweł and Kozłowski, Szymon and Ulaczyk, Krzysztof and Rybicki, Krzysztof A. and Iwanek, Patryk and Wrona, Marcin and Gromadzki, Mariusz and Albrow, Michael D. and Chung, Sun-Ju and Han, Cheongho and Hwang, Kyu-Ha and Kim, Doeon and Jung, Youn Kil and Kim, Hyoun Woo and Ryu, Yoon-Hyun and Shin, In-Gu and Shvartzvald, Yossi and Yang, Hongjing and Yee, Jennifer C. and Zang, Weicheng and Cha, Sang-Mok and Kim, Dong-Jin and Kim, Seung-Lee and Lee, Chung-Uk and Lee, Dong-Joo and Lee, Yongseok and Park, Byeong-Gon and Pogge, Richard W. and Jørgensen, Uffe G. and Longa-Peña, Penélope and Sajadian, Sedighe and Skottfelt, Jesper and Snodgrass, Colin and Tregloan-Reed, Jeremy and Bach-Møller, Nanna and Burgdorf, Martin and D’Ago, Giuseppe and Haikala, Lauri and Hitchcock, James and Hundertmark, Markus and Khalouei, Elahe and Peixinho, Nuno and Rahvar, Sohrab and Southworth, John and Spyratos, Petros (2023) 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. The Astronomical Journal, 166 (3). p. 116. ISSN 0004-6256

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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 χ2 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.

Item Type: Article
Subjects: Archive Paper Guardians > Physics and Astronomy
Depositing User: Unnamed user with email support@archive.paperguardians.com
Date Deposited: 15 Nov 2023 07:29
Last Modified: 15 Nov 2023 07:29
URI: http://archives.articleproms.com/id/eprint/2225

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