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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.; Koshimoto, Naoki; Bennett, David P.; Sumi, Takahiro; Rattenbury, Nicholas J.; Suzuki, Daisuke; Miyazaki, Shota; Bond, Ian A.; Udalski, Andrzej; Gould, Andrew; Bozza, Valerio; Dominik, Martin; Hirao, Yuki; Kondo, Iona; Kirikawa, Rintaro; Hamada, Ryusei; Abe, Fumio; Barry, Richard; Bhattacharya, Aparna; Fujii, Hirosane; Fukui, Akihiko; Fujita, Katsuki; Ikeno, Tomoya; Ishitani Silva, Stela; Itow, Yoshitaka; Matsubara, Yutaka; Matsumoto, Sho; Muraki, Yasushi; Niwa, Kosuke; Okamura, Arisa; Olmschenk, Greg; Ranc, Clément; Toda, Taiga; Tomoyoshi, Mio; Tristram, Paul J.; Vandorou, Aikaterini; Yama, Hibiki; Yamashita, Kansuke; Mróz, Przemek; Poleski, Radosław; Skowron, Jan; Szymański, Michał K.; Poleski, Radek; Soszyński, Igor; Pietrukowicz, Paweł; Kozłowski, Szymon; Ulaczyk, Krzysztof; Rybicki, Krzysztof A.; Iwanek, Patryk; Wrona, Marcin; Gromadzki, Mariusz; Albrow, Michael D.; Chung, Sun-Ju; Han, Cheongho; Hwang, Kyu-Ha; Kim, Doeon; Jung, Youn Kil; Kim, Hyoun Woo; Ryu, Yoon-Hy...

Authors

Yuki K. Satoh

Naoki Koshimoto

David P. Bennett

Takahiro Sumi

Nicholas J. Rattenbury

Daisuke Suzuki

Shota Miyazaki

Ian A. Bond

Andrzej Udalski

Andrew Gould

Valerio Bozza

Martin Dominik

Yuki Hirao

Iona Kondo

Rintaro Kirikawa

Ryusei Hamada

Fumio Abe

Richard Barry

Aparna Bhattacharya

Hirosane Fujii

Akihiko Fukui

Katsuki Fujita

Tomoya Ikeno

Stela Ishitani Silva

Yoshitaka Itow

Yutaka Matsubara

Sho Matsumoto

Yasushi Muraki

Kosuke Niwa

Arisa Okamura

Greg Olmschenk

Clément Ranc

Taiga Toda

Mio Tomoyoshi

Paul J. Tristram

Aikaterini Vandorou

Hibiki Yama

Kansuke Yamashita

Przemek Mróz

Radosław Poleski

Jan Skowron

Michał K. Szymański

Radek Poleski

Igor Soszyński

Paweł Pietrukowicz

Szymon Kozłowski

Krzysztof Ulaczyk

Krzysztof A. Rybicki

Patryk Iwanek

Marcin Wrona

Mariusz Gromadzki

Michael D. Albrow

Sun-Ju Chung

Cheongho Han

Kyu-Ha Hwang

Doeon Kim

Youn Kil Jung

Hyoun Woo Kim

Yoon-Hyun Ryu

In-Gu Shin

Yossi Shvartzvald

Hongjing Yang

Jennifer C. Yee

Weicheng Zang

Sang-Mok Cha

Dong-Jin Kim

Seung-Lee Kim

Chung-Uk Lee

Dong-Joo Lee

Yongseok Lee

Byeong-Gon Park

Richard W. Pogge

Uffe G. Jørgensen

Penélope Longa-Peña

Sedighe Sajadian

Jesper Skottfelt

Colin Snodgrass

Jeremy Tregloan-Reed

Nanna Bach-Møller

Martin Burgdorf

Giuseppe D’Ago

Lauri Haikala

James Hitchcock

Markus Hundertmark

Elahe Khalouei

Nuno Peixinho

Sohrab Rahvar

Petros Spyratos



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.

Journal Article Type Article
Acceptance Date Jul 18, 2023
Online Publication Date Aug 18, 2023
Publication Date Sep 1, 2023
Deposit Date Aug 21, 2023
Journal The Astronomical Journal
Print ISSN 0004-6256
Electronic ISSN 1538-3881
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 166
Issue 3
Article Number 116
DOI https://doi.org/10.3847/1538-3881/ace908
Keywords Xallarap effect, Brown dwarfs, Gravitational microlensing